September · Australia
Best time to visit Great Barrier Reef in September Weather, crowds & prices
Weather in Great Barrier Reef in September
Average temperature 23°C, 59 mm of rain, about 29 days with 6+ hours of sunshine and 75% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
8.2/10
Ranked #4 of 12 months
- Avg temp
- 23°C
- Rainfall
- 59 mm
- Humidity
- 75%
- Days with 6h+ sun
- 29
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Great Barrier Reef scores 8.2/10 for nature and wildlife travel - an above-average month (#4 of 12). Expect around 23°C, 59 mm of rain, and roughly 29 days with 6+ hours of sunshine this month.
From June to October, dry southeasterly winds clear the reef's water to 30m visibility—prime snorkeling season.
September in Great Barrier Reef — reliably good (4th best month)
September averages 23°C (74°F) — warm for the outdoors: start trails early, use shaded routes at midday, and carry more water than you think you need.
Rainfall runs 59 mm, so plan one flexible day in three; you still get about 29 days with 6+ hours of sunshine and 12 hours of daylight.
It scores 8.2/10 here, 4th of 12 months, against 9/10 in the destination's best month.
Pack light clothing, a hat and real sun protection, a packable rain layer, footwear you can get muddy.
Plan for mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Great Barrier Reef in September?
- In September, Great Barrier Reef averages 23°C, 59 mm of rain, and about 29 days with 6+ hours of sunshine. Its climate-comfort score is 8.2/10.
- Is September a good time to visit Great Barrier Reef?
- September earns a 8.2/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Great Barrier Reef in September?
- Expect about 59 mm of rain in September. Average humidity is 75% and there are about 29 days with 6+ hours of sunshine.
Curated in Great Barrier Reef
Tickets & experiences
Things to do in Great Barrier Reef
Great Barrier Reef, Australia. Live activities and tours from GetYourGuide, matched to this destination.