Weather in Cairns in September 2025
- September is usually the driest month of the year in Cairns
Average weather
Average temperature in Cairns in September
The expected average maximum temperature in September is +75°F with a maximum of +79°F and a minimum of +66°F.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +75°F to +75°F.
Is Cairns warm or cold in September?
Cairns is typically warm in September.
Maximum temperatures go up compared to the previous month from +75°F to +79°F. The minimum temperature also goes up from +66°F to +68°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Cairns:
Water temperature in Cairns in September
Water in Cairns in September is Comfortable. It varies from +74°F to +80°F, with an average of +77°F. This is almost similar to the air temperature, which averages +79°F.
In September, water temperatures are average relative to the rest of the year:
Can you swim in Cairns in September?
Climate in Cairns in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +75°F | +79°F | +81°F | ||||
| Min. temperature | ||||||
| +50°F | +50°F | +61°F | ||||
| Max. temperature | ||||||
| +88°F | +91°F | +93°F | ||||
| Rainfall | ||||||
| 27 mm | 20 mm | 31 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +75°F | +77°F | +80°F | ||||
| Humidity | ||||||
| 74% | 72% | 74% | ||||
| Air pressure | ||||||
| 1016 HPa | 1015 HPa | 1013 HPa | ||||
| Sunny days | ||||||
| 8 | 8 | 7 | ||||
| Cloudy days | ||||||
| 11 | 12 | 11 | ||||
| Rainy days | ||||||
| 12 | 10 | 12 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September often has better weather than August. It’s getting warmer as September arrives. The average maximum temperature goes up from +75°F to +79°F during the day. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 27 mm to 20 mm. It feels drier, as humidity decreases from 74% to 72%. The average wind speed doesn’t change much during September, staying around 3 m/s. The amount of sunny days stay about the same, averaging 8 sunny days during the month.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 4 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Cairns is gradually increasing during September, going from 1 m/s to 4 m/s over the course of the month.
Rain
How was the weather last September in Cairns?
Climate Change Over the Years
The climate in Cairns in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1982 (+76°F) and the highest in 2013 (+86°F). The driest year was 2002 with only 513 mm of rainfall, and the wettest year was 2023 with 3123 mm.
FAQ
Is September a good time to visit Cairns?
Can you sunbathe in Cairns in September?
Can you swim in Cairns in September?
Is Cairns rainy in September?
Is it sunny in Cairns in September?
Other cities in Australia
Monthly weather in Cairns
Source of the data
For this page, we’ve looked at the typical weather in Cairns, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.