What to expect in Great Barrier Reef in May
May is a strong choice for Great Barrier Reef: 28° / 20°, with manageable crowds at the big attractions and prices close to the yearly average.
Great Barrier Reef weather in May
Typical conditions in Great Barrier Reef during May, based on long-run climate normals rather than any single year. Treat it as a planning guide, not a forecast.
| Average high | 28°C 82°F |
|---|---|
| Average low | 20°C 68°F |
| Rainfall | Moderate 30/100 |
| Total rainfall | 89 mm3.5 in |
| Rainy days | 14 |
| Sea temperature | 26°C 78°F |
| Daylight | 11 h 19 min |
| How it feels | Warm and comfortable |
Rainfall figures are for Cairns.
Average highs sit around 28°C with lows near 20°C. It is one of the drier months — pack light.
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
Light layers for 28°C days and something with sleeves for evenings, which cool to around 20°C.
What it costs
Costs in May 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 21% less.
Who this month suits
- Travellers who want the most reliable weather
- Anyone travelling on a budget
Events & what’s on
No major festivals fall in May, so the destination feels like its everyday self.
Great Barrier Reef in May 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 |
|---|---|---|---|---|
| March | 31° / 23° | Low | $ | 59 |
| April | 30° / 22° | Moderate | $$ | 60 |
| May · This month | 28° / 20° | Moderate | $$ | 59 |
| June | 26° / 18° | High | $$ | 59 |
| July | 25° / 17° | High | $$ | 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 May
If the destination is negotiable but the month is not, these places are at their best in May.
Figures are climate normals and modelled estimates — a planning guide, not a forecast. We separate fact, estimate and recommendation. Updated October 2026
