Monthly climate guide
Cairns weather in September
Expect warm weather in Cairns in September: afternoons reach about 27°C (80°F), while nights drop to around 18°C (64°F). Around 22 mm of rain falls over the month (fairly dry), and skies are mostly sunny. Daytime highs are 2°C warmer than August and 2°C cooler than October.
What stands out in September
- Rain is well below Cairns's usual level (around 84% less).
- Humidity near 73% makes 27°C feel stickier than it sounds.
- Skies are at their clearest this time of year.
- It's one of the drier stretches of the year in Cairns.
Avg high
27°C
80°F
Avg low
18°C
64°F
Rainfall
22 mm
fairly dry
Humidity
73%
relative
Sky
30%
cloud · mostly sunny
Cairns weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 29°C / 84°F | 23°C / 73°F | 326 mm | 84% | 67% |
| February | 28°C / 83°F | 23°C / 73°F | 327 mm | 86% | 63% |
| March | 27°C / 80°F | 22°C / 72°F | 359 mm | 89% | 72% |
| April | 26°C / 79°F | 20°C / 69°F | 138 mm | 86% | 52% |
| May | 24°C / 76°F | 19°C / 65°F | 104 mm | 84% | 47% |
| June | 23°C / 74°F | 17°C / 62°F | 55 mm | 83% | 46% |
| July | 23°C / 74°F | 16°C / 61°F | 41 mm | 81% | 40% |
| August | 25°C / 76°F | 16°C / 61°F | 20 mm | 75% | 33% |
| September | 27°C / 80°F | 18°C / 64°F | 22 mm | 73% | 30% |
| October | 29°C / 83°F | 19°C / 67°F | 59 mm | 72% | 32% |
| November | 30°C / 86°F | 21°C / 70°F | 57 mm | 73% | 39% |
| December | 30°C / 87°F | 22°C / 72°F | 144 mm | 76% | 52% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- Sunglasses
Is September a good time to visit Cairns?
Compare the months in the chart above to find your ideal window.
Best time to visit Cairns →Other Australia cities in September
Cite or embed this data
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Cairns weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/australia/cairns/september
<a href="https://weathercompare.eu/weather/australia/cairns/september">Cairns weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/australia/cairns" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Cairns weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/australia/cairns/september">Cairns weather in September</a> – WeatherCompare</p>
Cairns in September: quick answers
Is September a good time to visit Cairns?
Yes. September is one of the best months for Cairns, with highs around 27°C and about 22 mm of rain.
How warm is Cairns in September?
Average highs are about 27°C (80°F) and average lows about 18°C (64°F), based on 10 years of daily data.
Does it rain a lot in Cairns in September?
Cairns typically gets around 22 mm of rain in September — fairly dry.
Figures are long-term averages for the area around Cairns (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.