Best Time to Snorkel the Great Barrier Reef

You can snorkel the Great Barrier Reef all year. For dry, clear days choose June to October; for the warmest water choose December to March, when you will wear a stinger suit.

Quick answer

There is no closed season. Winter (June to August) brings dry weather and water around 24°C. Summer (December to February) brings water around 29°C, more rain and stingers. Wind affects your day more than the month, so allow two or three days in case conditions change.

The reef season by season

- June to August: dry and sunny, water about 24°C. Whale season starts, so look out for humpbacks. A 2–3mm wetsuit keeps you comfortable.
- September to November: water warming to about 26–28°C, often settled weather. Coral spawning happens on a few nights in late spring, usually November or December.
- December to February: the warmest water, about 29°C, and the wettest months, with short heavy downpours. Stinger season: wear a lycra stinger suit.
- March to May: water about 26°C, rain easing, and plenty of young fish on the reef. Stingers can still be around until about May.

Questions visitors ask

“Can I still snorkel in stinger season?”

Yes. Reef trips run all year. Marine stingers are present in the warmer months, broadly November to May, and a full-length lycra stinger suit is the simple protection. Many reef boats carry them; check your tour’s inclusions. See using a wetsuit.

“When is the reef least crowded?”

February is usually the quietest month, and July (Australian school holidays) the busiest. Book ahead in school holidays.

“When is the water clearest?”

Clear water follows calm days. The drier months from June to October often give good visibility, but any month can be beautiful when the wind drops.

“I only have one day – what if the weather is bad?”

Book early in your stay so you have spare days if a trip is rescheduled for weather. Most reef boats sail in rain; strong wind is what affects comfort and visibility.