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When is the best time to visit Cairns and the Great Barrier Reef?

Q: When is the best time to visit Cairns and the Great Barrier Reef?

May to October is the best time for Cairns and the reef. Those months are dry, under 95mm against over 400mm in January, the days are in the mid to high twenties and the water is calmest. The wet season runs December to March.

May to October, and it is not close. Those months are dry — under 95mm a month against over 400mm in January — the days sit in the mid to high twenties, and the water is calmest for the reef. The wet runs December to March and brings the stingers with it.

Checked on 6 October 2026.

Cairns is in the tropics, so it does not really have four seasons — it has a dry and a wet, and the difference between them is enormous. February averages 437mm of rain; August averages 26mm. That one fact decides when to go.

Cairns month by month

Month	Average top	Average overnight	Rain	What it gives you
January	31.5°C	23.8°C	404.8 mm	Warm water and empty beaches, in the heart of the wet.
February	31.3°C	23.8°C	437.5 mm	The wettest month — green, dramatic and the quietest time of year.
March	30.7°C	23.2°C	422.1 mm	Still wet, still warm, and the rainforest at its most alive.
April	29.4°C	21.8°C	201.8 mm	The rain drops away by half. Shoulder season and good value.
May	27.7°C	20.0°C	92.0 mm	The dry begins. Comfortable days and calming water.
June	26.1°C	18.0°C	45.5 mm	Excellent. Dry, mild, and the reef at its clearest.
July	25.9°C	17.2°C	33.2 mm	The pick of the year — coolest days, driest air, best visibility.
August	26.7°C	17.4°C	26.5 mm	The driest month of all, at 26mm. Perfect reef weather.
September	28.2°C	18.8°C	34.1 mm	Warming back up and still dry. Many people's favourite.
October	29.7°C	20.7°C	47.2 mm	Warm, dry and the last of the quiet before the build-up.
November	30.8°C	22.4°C	87.9 mm	The build-up — hot and humid, with storms arriving.
December	31.5°C	23.4°C	193.8 mm	Hot, wet and lush, with the warmest water of the year.

Bureau of Meteorology averages for Cairns Aero, over 83 years.

What this means for the reef

June to September is the best diving and snorkelling.Less rain means less run-off, which means clearer water.
The water is warm all yearit does not drop below the mid-twenties even in winter, so you are never cold in it.
Stinger season runs roughly November to May.Operators provide stinger suits and the reef sites are further offshore where the risk is lower, but it is why the dry season is the easy answer.
Wind matters more than rain.A calm wet-season day is better on the water than a windy dry-season one, and your skipper decides on the morning.

And for the rainforest

The wet season is when the Daintree is at its bestwaterfalls running, everything green, and the air thick with it.
Cape Tribulation stays openthrough the wet; the roads are sealed to it.
Fewer peoplebetween December and March, and the prices follow.

So when would we book?

August or Septemberif you can choose freely — dry, warm, and the clearest water of the year.
June or Julyfor the coolest, driest days, which makes the long walks easier.
May or Octoberat either shoulder, still dry and quieter.
December to Marchif your dates are fixed — the rainforest is spectacular, the water is at its warmest and it is the cheapest time to go.