Cairns weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: May, August – November
What is the weather like in Cairns in September?
In September, Cairns is warm: daytime highs average 25 °C, and even at night it stays warm at around 21 °C. The sea averages 24.8 °C – pleasant for swimming. The sun shines for around 9 hours a day. Rain falls on about 5 days, adding up to 18 mm. The air is often humid and muggy. All in all, September is an excellent month for a holiday in Cairns.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 80 | 94 | 95 |
| Day | 23° | 25° | 26° |
| Night | 20° | 21° | 23° |
| Sea | 24° | 25° | 26° |
| Sun | 8 h | 9 h | 9 h |
| Rain days | 5 | 5 | 7 |
More details for September
- Daylight
- 11 h 59 min06:13 – 18:12
- UV index
- 11 · extremeclear sky, noon (estimate)
- Muggy days
- 16 daysdew point 18 °C or more
- Wind
- 16 km/haverage daily peak
- Cloud cover
- 45 %on average
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+10Australia/Brisbane
How the score comes together
- Temperatureweight 35 %92 %
- Seaweight 25 %100 %
- Sunshineweight 20 %93 %
- Few rainy daysweight 20 %92 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Insect repellent
Cairns in September: quick answers
Is Cairns hot in September?
Warm rather than hot: in September, daytime highs in Cairns average 25 °C and nights cool to about 21 °C.
Can you swim in Cairns in September?
Yes. In September the sea averages 24.8 °C – pleasant for swimming.
Does it rain much in Cairns in September?
Rain falls on about 5 days, adding up to 18 mm.
Cairns month by month
The whole year in CairnsAll destinations: Australia
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)