Cairns weather in September
September in Cairns: warm, dry, with clean air — an excellent time to visit.
#3 of 12 months in Cairns · #127 of 604 destinations to visit in September · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Cairns climate normals — September
| Daytime high | 25°C / 78°F | 🌤 warm |
|---|---|---|
| Nighttime low | 21°C / 69°F | |
| Feels like (high) | 27°C / 81°F | |
| Rainfall | 21 mm / 0.8 in | ☀️ dry |
| Rainy days | 6 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 19°C / 66°F | |
| Sunshine | 10.8 h/day | |
| Daylight | 12 h | |
| Wind | 18 km/h / 11 mph | |
| Air quality (US AQI) | 29 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Cairns?
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Cairns in September — FAQ
- Is September a good time to visit Cairns?
- September in Cairns: warm, dry, with clean air — an excellent time to visit. It ranks #3 of 12 months for Cairns on SeasonMap's comfort score (87/100).
- What is the weather like in Cairns in September?
- In September, Cairns averages a daily high of 25.4°C and a low of 20.6°C, with about 20.5 mm of rain over roughly 5.8 rainy days.
- What is the air quality in Cairns in September?
- Cairns has a mean US Air Quality Index of about 29 in September.