Cairns is a tropical paradise all year round. Between May and October, the dry season offers clear skies, gentle breezes and comfortably warm days that make exploring the reef and beaches an incredible experience. From November to April, the wet season brings warm, humid days and afternoon showers that make the rainforest and surrounding landscapes burst with life, transforming the area into a lush, green paradise.
Cairns’ tropical climate means there’s always something to enjoy outside, whether it’s diving among the Great Barrier Reef, spotting wildlife in the rainforest or simply soaking up the sun in the Esplanade Lagoon.
Our guide covers everything you need to know about Cairns’ climate and weather to plan your trip, including monthly averages for temperature, rainfall, and humidity – not only so you know when to book your flight to Cairns, but also to help you pack smart and make the most of your Cairns adventure.
Cairns climate overview
Cairns has a tropical climate, with distinct dry and wet seasons that shape life in this tropical paradise.
The dry season, from May to October, brings sunny skies, low humidity and warm, comfortable days that are perfect for exploring the Great Barrier Reef. On the other hand, the wet season from November to April is hot and humid, with frequent afternoon showers that keep the rainforest and surrounding landscapes lush.
Cairns’ warm climate makes it the perfect destination for outdoor adventures no matter when you visit. And to help you pack and plan for your trip, we’ve broken down Cairns’ climate below by season and month, including average temperatures, rainfall, and humidity.
Cairns seasons
Wet season (November to April)
The wet season transforms Cairns into a lush, tropical paradise. Daytime temperatures rise to 29–31°C, with nights remaining warm at 22–24°C. Humidity sits high at 65–78% in the mornings and 60–70% in the afternoons. Rainfall is frequent, averaging 190–430mm per month, often arriving as short but heavy showers or storms in the late afternoon and evening.
On average, rainfall occurs on around 13.9 days in December, rising to 18.9 days in February and 19.3 days in March, with the wet season as a whole averaging roughly 264.05 mm of rain over six months. But while rains and tropical storms are common in the wet season, they are usually short-lived and help bring the tropical landscape to life.
While sudden tropical downpours can interrupt plans, there are still plenty of things to do – waterfalls are in full flow, the foliage is vibrant, and wildlife is active, making it a spectacular time to visit the Daintree, Barron Gorge, and Atherton Tablelands. Adventure activities are still very possible in the wet season if you plan around the afternoon showers, as early mornings often bring clear skies perfect for reef trips, river rafting, and hiking.
Cairns’ climate during the wet season ensures the sea remains warm at 28.3°C on average - perfect for swimming, reef snorkelling, and island adventures around Green and Fitzroy Islands.
If travelling to Cairns in the wet season, be aware of the cyclone season between January and March and stay updated with local forecasts.
Dry season (May to October)
The dry season in Cairns brings the region’s most comfortable and predictable weather, with warm, sunny days and lower humidity. This combination typically makes it the best time to visit Cairns.
Average daytime temperatures range from 21–25°C, while nights cool slightly to 18–21°C. Rainfall is minimal, averaging between 26 and 92mm per month, and the skies are generally clear, so you can plan reef trips or rainforest adventures with confidence.
Humidity is lower than in the wet season, typically sitting around 60–75% in the morning and dropping to 55–65% by the afternoon. This makes hiking, sightseeing, and beach walks more pleasant without the sticky tropical heat.
Cairns’ climate during the dry season is perfect for exploring natural attractions. The Great Barrier Reef offers calm, clear waters ideal for snorkelling and scuba diving, while rainforest trails in the Daintree, Mossman Gorge, and Atherton Tablelands are easy to explore.
For adventure seekers, activities such as white-water rafting on the Tully River, zip-lining, and skydiving are all popular during this season. Evenings are great for strolling along the Esplanade or enjoying sunset cruises along Trinity Inlet.
Cairns weather by month
Cairns in January
Cairns climate in January is hot and humid, with daily temperatures averaging between 23°C and 32°C. It’s the height of summer in the tropics, with regular afternoon showers that bring short bursts of heavy rain, turning the rainforest into a lush paradise and creating spectacular waterfalls. With humidity averaging 75% in the mornings, days can feel steamy, so January is the ideal time to cool off at waterfalls or enjoy rainforest walks before late-afternoon showers roll in.
The summer months also coincide with the breeding season for many reef fish around Cairns, so you’ll find more marine activity beneath the waves, though reef visibility may be slightly reduced due to runoff.
Note that during Cairns’ wet season, it’s a good idea to stay flexible with your plans and itinerary to work around any sudden showers.
Cairns January weather overview
Avg min temp: |
23.8°C |
Avg max temp: |
31.5°C |
Avg humidity: |
75% morning / 66% afternoon |
Avg rainfall: |
402 mm |
Avg days of rain: |
18.6 |
Avg sea temp: |
28.8°C |
Cairns in February
February in Cairns remains very warm and humid, with daily temperatures averaging between and 23°C and 32°C, with short but heavy showers that can offer a welcome break from the heat.
February is the wettest month of the year in Cairns, keeping the rainforests lush and waterfalls gushing. However, reef conditions may still be murky due to runoff.
Cyclone activity is a possibility, particularly from late January through March, so it’s wise to keep an eye on forecasts. Planning early-morning excursions and staying flexible with your schedule will help you make the most of the month’s tropical adventures.
It’s also a fantastic time to indulge in Cairns’ vibrant foodie scene, from fresh seafood and tropical fruits to markets and local eateries.
Cairns February weather overview
Avg min temp: |
23.8°C |
Avg max temp: |
31.3°C |
Avg humidity: |
78% morning / 69% afternoon |
Avg rainfall: |
437.5 mm |
Avg days of rain: |
18.9 |
Avg sea temp: |
28.8°C |
Cairns in March
Cairns' climate in March remains firmly in the wet season, with frequent rainfall and high humidity. Average temperatures hover between 23°C and 30°C, keeping conditions warm and tropical throughout the month. Note that cyclone risk is elevated during this month, so it’s important to monitor forecasts if you’re planning outdoor adventures.
On the flip side, Cairns’ climate in March makes it an ideal time to go river rafting on the Tully or Barron Rivers, visit the Atherton Tablelands’ waterfalls and wineries, and explore local museums or night markets.
Cairns March weather overview
Avg min temp: |
23.2°C |
Avg max temp: |
30.7°C |
Avg humidity: |
78% morning / 67% afternoon |
Avg rainfall: |
422.1 mm |
Avg days of rain: |
19.3 |
Avg sea temp: |
28.3°C |
Cairns in April
April marks the tail end of the wet season in Cairns, with average daily temperatures between 21°C and 30°C and decreasing rainfall that still provides luxuriant vegetation and full-flowing waterfalls. Reef conditions are gradually improving, though some areas, especially inshore reefs closer to the coast, may still be murky for snorkelling and diving.
For the best snorkelling experience in Cairns in April, focus on outer reefs, with Flynn and Hastings Reef being an excellent choice, as these sites are less affected by runoff.
Cairns April weather overview
Avg min temp: |
21.8°C |
Avg max temp: |
29.4.3°C |
Avg humidity: |
78% morning / 65% afternoon |
Avg rainfall: |
201.8 mm |
Avg days of rain: |
17.6 |
Avg sea temp: |
27.7°C |
Cairns in May
May ushers in the start of Cairns’ dry season, bringing warm, pleasant weather and far less rain. Average temperatures sit between 20°C and 28°C, making it ideal for outdoor adventures. With sea temperatures hovering around a perfect 26°C, it’s prime time for snorkelling or diving on the Great Barrier Reef.
Fewer showers also mean great conditions for taking a scenic drive to Port Douglas or enjoying al fresco dining along the Esplanade.
Cairns May weather overview
Avg min temp: |
20°C |
Avg max temp: |
27.7°C |
Avg humidity: |
76% morning / 64% afternoon |
Avg rainfall: |
92 mm |
Avg days of rain: |
13.9 |
Avg sea temp: |
26.1°C |
Cairns in June
June brings some of the best weather of the year in Cairns, as the climate settles into the dry season and the region moves into its mild tropical winter. With average temperatures between 18°C and 26°C, days are still pleasantly warm while evenings are cooler and refreshing. Rainfall drops to just around 45 mm across the month, meaning clear skies and ideal conditions for reef trips and beach walks.
The sea remains enticing at around 25°C, which is perfect for snorkelling, diving or spending a day at Fitzroy or Green Island.
Whether you’re exploring the reef, hiking in the Daintree, taking a cruise, or relaxing along the Esplanade, June is the perfect time to enjoy tropical weather with much less humidity than during the summer months.
Cairns June weather overview
Avg min temp: |
28°C |
Avg max temp: |
26.1°C |
Avg humidity: |
74% morning / 61% afternoon |
Avg rainfall: |
45.5mm |
Avg days of rain: |
10.1 |
Avg sea temp: |
25°C |
Cairns in July
July marks the heart of winter in Cairns, but the weather couldn’t be better. With average temperatures between 17°C and 25°C, days are warm, evenings are cool and refreshing, and rainfall is low at just around 33 mm. Humidity is comfortable, making it a perfect month for outdoor adventures without the sticky summer air.
Cairns’ climate in July is also ideal for whale watching, as the annual humpback season kicks off. The sea sits at a comfortable 23.8°C, perfect for snorkelling or diving at the Great Barrier Reef.
On land, a visit to Kuranda via Skyrail or Scenic Train is a must, with clear skies and minimal rainfall allowing you to fully enjoy the rainforest and Barron Gorge views.
Cairns July weather overview
Avg min temp: |
17.2°C |
Avg max temp: |
25.8°C |
Avg humidity: |
72% morning / 58% afternoon |
Avg rainfall: |
33.2mm |
Avg days of rain: |
9.1 |
Avg sea temp: |
23.8°C |
Cairns in August
August is one of the best months to explore Cairns, with mild winter days between 17°C and 26°C, low humidity, and minimal rainfall (around 26.5 mm over the entire month). The clear skies and calm seas make snorkelling or diving on the Great Barrier Reef ideal. It’s also the peak of humpback whale season, so whale-watching trips are in full swing.
On land, the pleasant weather is perfect for taking in the sights along the coast and driving to Cape Tribulation, Palm Cove or Port Douglas. August is also festival season with sunny, dry conditions allowing visitors to enjoy Cairns Festival without worrying about sudden showers.
Cairns August weather overview
Avg min temp: |
17.4°C |
Avg max temp: |
26.7°C |
Avg humidity: |
70% morning / 56% afternoon |
Avg rainfall: |
26.5mm |
Avg days of rain: |
8 |
Avg sea temp: |
23.8°C |
Cairns in September
September is one of the best months to enjoy Cairns’ climate. With average temperatures ranging from 18°C to 28°C, humidity around 66% in the morning and 55% in the afternoon and minimal rainfall, conditions are ideal for outdoor adventures.
The sea warms to around 25°C, making it a fantastic time to explore multiple reefs or sail out to Michaelmas Cay and Paradise Reef under sunny, calm conditions
Cairns September weather overview
Avg min temp: |
18.8°C |
Avg max temp: |
28.2°C |
Avg humidity: |
66% morning / 55% afternoon |
Avg rainfall: |
32.7mm |
Avg days of rain: |
7.6 |
Avg sea temp: |
25°C |
Cairns in October
October basks in the best of Cairns’ climate, with average temperatures between 20°C and 30°C, lower humidity than most of the year and light rainfall which averages just over 47 mm over the month. Note that most showers occur late afternoon or overnight, leaving the days free for outdoor adventures.
The sea warms to 26.1°C, and with stinger-free waters, it’s the perfect time for swimming and exploring the islands. If you’re opting for a reef trip, choosing a tour that includes Green Island and a Great Barrier Reef adventure will allow you to snorkel to an outer reef pontoon and enjoy time on Green Island itself.
Cairns October weather overview
Avg min temp: |
20.7°C |
Avg max temp: |
29.7°C |
Avg humidity: |
65% morning / 57% afternoon |
Avg rainfall: |
37.2mm |
Avg days of rain: |
8.5 |
Avg sea temp: |
26.1°C |
Cairns in November
In November, Cairns’ climate transitions towards the wet season, with average temperatures between 22°C and 31°C, humidity around 68% in the morning and 60% in the afternoon, and rainfall averaging 88 mm across the month. Afternoon or brief evening showers provide a refreshing break from the heat, and leave plenty of time to enjoy outdoor adventures during the day.
The sea warms to 27.7°C, ideal for snorkelling, diving or just relaxing in the water. However, it’s important to note that November marks the beginning of the stinger season, so you’ll need to wear a hooded stinger suit when in the water. If you don’t want to go in the water, you can still enjoy the beach and even spot wildlife like cassowaries at Mission Beach and Etty Bay.
Cairns November weather overview
Avg min temp: |
22.3°C |
Avg max temp: |
30.8°C |
Avg humidity: |
68% morning / 60% afternoon |
Avg rainfall: |
88.3mm |
Avg days of rain: |
10.3 |
Avg sea temp: |
27.7°C |
Cairns in December
December in Cairns marks the start of the wet season, with Cairns’ climate bringing average highs of 32°C and lows of 23°C and high humidity. Rainfall increases, with around 14 days of showers, often short and heavy, bringing the rainforest to life. The sea temperature warms to a pleasant 28.3°C, perfect for a swim in the Esplanade Lagoon or exploring the nearby reef islands.
December is also the perfect time to explore Cairns’ botanical gardens, where the tropical blooms are at their best. And of course, during the festive season, Christmas markets and local events pop up around the city, giving visitors a chance to experience local food, crafts, and culture while enjoying the tropical summer atmosphere.
Cairns December weather overview
Avg min temp: |
23.4°C |
Avg max temp: |
31.5°C |
Avg humidity: |
70% morning / 62% afternoon |
Avg rainfall: |
192.5mm |
Avg days of rain: |
13.9 |
Avg sea temp: |
28.3°C |
*Average weather figures from bom.gov.au for the period 1991-2020
Best time to visit Cairns for weather
Thanks to its tropical climate and year-round warm temperatures, Cairns is a great holiday destination at any time of year.
That said, for dry, sunny days and comfortable temperatures, the best time to visit Cairns for good weather is from May to October, Cairns' dry season. During this time average daytime temperatures range from 18 to 25°C, humidity is at its lowest, and rain is infrequent, making it the perfect time for outdoor adventures – whether that’s in the rainforest or reef!
What to pack for Cairns’ weather
Cairns’ climate is tropical, meaning you’ll enjoy warm temperatures year-round, but the region experiences distinct wet and dry seasons, so it’s important to pack accordingly.
Packing smart will help you make the most of your trip, whether you’re planning to explore the Great Barrier Reef, trek through lush rainforests, or relax along the Esplanade. From lightweight layers and swimwear to rain gear and sun protection, the right items will keep you comfortable, prepared, and ready for adventure no matter the season.
Packing for Cairns’ dry season (May – October)
The dry season in Cairns offers sunny days, lower humidity, and cooler evenings, making it ideal for outdoor adventures.
Clothing
- Lightweight, breathable layers: cotton and linen tops and shorts will keep you comfortable during warm days.
- Light jumper or jacket: evenings can be cooler, particularly in the Atherton Tablelands or higher elevations.
- Sun protection: wide-brimmed hats, sunglasses, and long-sleeve UPF tops for sun-sensitive activities.
- Swimwear: the sea temperature is warm (around 25–27°C), perfect for snorkelling, diving, and beach walks.
Footwear
- Comfortable walking shoes: essential for exploring rainforest walks, boardwalks, or the hinterland.
- Sandals or reef shoes: ideal for water activities and casual strolls along the Esplanade.
Accessories & essentials
- Sunscreen (reef-safe): even though the dry season falls during the winter months, the tropical sun is still strong.
- Insect repellent: mosquitoes are less frequent than during the wet season but can still appear.
- Reusable water bottle: to stay hydrated in warm weather.
- Camera or smartphone: capture clear, sunlit photos of reefs, waterfalls, and wildlife.
Packing for Cairns’ wet season (November – April)
The wet season is hot and humid, with frequent afternoon showers and occasional tropical storms. It brings lush greenery, flowing waterfalls, and vibrant wildlife.
Clothing
- Lightweight, quick-dry clothing: essential for coping with sticky heat and sudden downpours.
- Waterproof jacket or poncho: afternoons often bring heavy showers, so this is a must.
- Swimwear: the sea warms to around 28°C, perfect for swimming, lagoon visits, and reef trips.
- Sun protection: hats, sunglasses, and long-sleeve UPF shirts to prevent sunburn during outdoor activities.
Footwear
- Waterproof sandals or reef shoes: useful for waterfalls, lagoons, and rainforest treks.
- Sturdy walking shoes: for wet and sometimes slippery rainforest trails.
Accessories & essentials
- Insect repellent: mosquitoes are more active due to humidity and rainfall.
- Dry bag: protect electronics and valuables from sudden downpours.
- Reusable water bottle: staying hydrated is crucial in high humidity.
- Camera with waterproof case: to capture the rainforest, waterfalls, and wildlife safely.
Cairns weather and climate FAQ
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When is the wet season in Cairns?
The wet season in Cairns typically runs from November to April. During this time, Cairns' climate is hot and humid, with frequent afternoon showers and occasional tropical storms. These rains keep the rainforest lush and bring waterfalls to life, creating a vibrant, green landscape.
-
What is the hottest month in Cairns?
January is usually the hottest month in Cairns. Average daytime temperatures can reach around 31–32°C and up to 40°C, with humidity often around 75% in the mornings. Cairns' climate in January feels very tropical, making it perfect for water-based activities to stay cool.
-
Does Cairns get cyclones?
Yes, Cairns is in a region prone to tropical cyclones, especially between late January and March. Cyclones are relatively rare but can bring heavy rain, strong winds, and rough seas. Monitoring forecasts during the wet season is recommended if you plan outdoor adventures.
-
How humid does it get in Cairns?
Cairns' climate is highly humid during the wet season (November–May), with morning humidity often above 75% and afternoons around 65–70%. In the dry season (May–October), humidity drops significantly, making outdoor activities more comfortable
-
Is it safe to visit Cairns in summer?
Yes, it is safe to visit Cairns in summer, but you should be prepared for hot, humid weather and occasional heavy showers. Early-morning excursions, staying hydrated, and checking forecasts for cyclones or tropical storms will help you enjoy Cairns' climate to the fullest when visiting in summer.
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Can you swim in Cairns all year round?
Yes! The sea around Cairns remains warm year-round, ranging from about 23–28°C. However, during the wet season (November–April), stingers like jellyfish can appear in the water, so wearing a protective stinger suit is recommended for safety.
-
Does it rain every day in the wet season?
No, it doesn’t rain every day of Carins’ wet season. Rainfall averages vary, with the wettest months seeing around 18–19 days of rain, but many of these are brief showers rather than all-day downpours. Mornings are often bright and sunny during the wet season, giving visitors plenty of time to enjoy outdoor adventures before the afternoon showers roll in.
Flights to Cairns
Virgin Australia offers direct flights to Cairns from major Australian cities, including:
