What to expect in Great Barrier Reef in December
December is a mixed month in Great Barrier Reef. You get 31° / 24°, but manageable crowds at the big attractions. Worth it for the right traveller.
Great Barrier Reef weather in December
Typical conditions in Great Barrier Reef during December, based on long-run climate normals rather than any single year. Treat it as a planning guide, not a forecast.
| Average high | 31°C 88°F |
|---|---|
| Average low | 24°C 75°F |
| Rainfall | Wet 65/100 |
| Total rainfall | 181 mm7.1 in |
| Rainy days | 14 |
| Sea temperature | 29°C 83°F |
| Daylight | 13 h 8 min |
| How it feels | Hot — midday shade matters |
Rainfall figures are for Cairns.
Average highs sit around 31°C with lows near 24°C. Expect a fair amount of rain, so plan indoor backups.
Crowds & demand
Crowd levels are Moderate for Great Barrier Reef — manageable crowds at the big attractions.
Prices & value
This month counts as shoulder season: prices close to the yearly average.
What to pack
Lightweight, breathable clothes, strong sun protection and a refillable bottle — highs near 31°C make midday heat the main constraint. Add a compact rain shell and shoes you do not mind soaking; this is one of the wetter months.
What it costs
Costs in December sit around the yearly average for Great Barrier Reef — neither a bargain nor a squeeze. Booking a few weeks out is usually enough. Compared with the most expensive month of the year, you are looking at roughly 14% less.
Who this month suits
- Anyone travelling on a budget
- Visitors who want to catch a festival
Events & what’s on
Look out for Coral Spawning, Marine Stinger Season while you’re there.
- Coral Spawning — Reef corals release synchronized clouds of eggs and sperm on warm summer nights.
- Marine Stinger Season — Box jellyfish and Irukandji risk closes unprotected beaches to swimmers each wet season.
Great Barrier Reef in December compared with nearby months
If your dates are flexible by a few weeks, this is what shifting them actually buys you.
| Month | Temp | Crowds | Price | Score |
|---|---|---|---|---|
| October | 29° / 21° | Moderate | $$ | 60 |
| November | 30° / 23° | Moderate | $$ | 62 |
| December · This month | 31° / 24° | Moderate | $$ | 48 |
| January | 31° / 24° | Moderate | $$ | 55 |
| February | 31° / 24° | Low | $ | 57 |
These months score higher for Great Barrier Reef on the same blend of weather, crowds and price. Same destination, better odds.
Or go somewhere else in December
If the destination is negotiable but the month is not, these places are at their best in December.
Figures are climate normals and modelled estimates — a planning guide, not a forecast. We separate fact, estimate and recommendation. Updated October 2026
