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Cairns in September: Weather, Average temperature and Climate

Planning a trip and want to know what the weather in Cairns in September will be like? Take a look at our weather guide for Cairns, based on historical data.
Check flight prices to Cairns on Avionero:
September

Weather in Cairns in September 2025

Great Weather
Warm
☁️
Cloudy
🌊
Comfortable water
September is an ideal time to visit Cairns if you're seeking a destination with brilliant weather. Anticipate average maximum temperatures of +26°C and about 8 sunny days, ensuring you'll have ample opportunities to soak up the sunshine. It's worth noting, though, that there may be some rainfall, with approximately 20 mm of precipitation over an average of 10 rainy days. So, prepare your sunglasses, a beach towel, and great walking shoes, as it's most likely going to be amazing weather. Search flights in one click on Avionero.
Good to know:
  • September is usually the driest month of the year in Cairns

Average weather

☀️
+26°C
Avg. max. temperature
+10°C
Min.
+33°C
Max.
20 mm
Total precipitation
72%
Avg. humidity
3 m/s
Avg. wind
8 ☀️
Sunny Days
12 ⛅️
Cloudy
10 🌦
Rainy
Our opinion: Cairns has great weather in September.

Average temperature in Cairns in September

Here are the expected maximum, average and minimum temperatures in Cairns for September based on the historical data.
Last Year
Historical Data

Going from a maximum of +26°C during the day to a minimum of +19°C during the night, the temperature in September averages around +24°C.

The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +24°C to +24°C.

Is Cairns warm or cold in September?

Cairns is typically warm in September.

Maximum temperatures go up compared to the previous month from +24°C to +26°C. The minimum temperature also goes up from +19°C to +20°C.

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 +23°C to +27°C, with an average of +25°C. This is almost similar to the air temperature, which averages +26°C.

In September, water temperatures are average relative to the rest of the year:

The warmest water temperatures in Cairns are reached in February, when the average sea temperature rises to +29°C. The coldest water temperatures are in July, with an average of +24°C.

Can you swim in Cairns in September?

The water in Cairns in September is pretty comfortable (+25°C in average). Ideal for swimming, especially in outdoor pools and open water. Suitable for recreational and casual swimmers.
🦭
Cold
Below +16°C
🏄‍♂️
Fresh
16°C - 21°C
🏊
Comfortable
21°C - 25°C
👙
Warm
25°C - 28°C
🔥
Very warm
+28°C and up
Don’t forget a large beach towel or two for drying off.

Climate in Cairns in September

Cairns weather looks like this, on average, in September and the surrounding months.
AugustSeptemberOctober
Avg. temperature
+24°C+26°C+27°C
Min. temperature
+10°C+10°C+16°C
Max. temperature
+31°C+33°C+34°C
Rainfall
27 mm20 mm31 mm
Wind
3 m/s3 m/s3 m/s
Avg. water temperature
+24°C+25°C+26°C
Humidity
74%72%74%
Air pressure
1016 HPa1015 HPa1013 HPa
Sunny days
887
Cloudy days
111211
Rainy days
121012
Snowy days
000

September often has better weather than August. It’s getting warmer as September arrives. The average maximum temperature goes up from +24°C to +26°C 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

Wind speed in Cairns in September based on historical data.
Last Year
Historical Data

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

Amount of rainfall in mm during September in Cairns based on historical data.
Last Year
Historical Data
Typically, there is a 50% chance of rain on an average day in September, with total rainfall of approximately 70 mm. The maximum amount of rainfall per day is around 16 mm, which is considered light rain. September is a pretty wet month with over 15 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of galoshes.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Cairns wettest month is January, where a typical day has a 71% chance of precipitation and 290 mm of rainfall per day. September, on the other hand, is the driest month with a mere 33% chance of precipitation and 20 mm of rainfall per day.

How was the weather last September in Cairns?

This is the weather in Cairns in September 2023:
1 September
☀️
+24°C
2 September
☀️
+24°C
3 September
☁️
+23°C
4 September
☀️
+24°C
5 September
☀️
+24°C
6 September
☁️
+25°C
7 September
☁️
+24°C
8 September
☁️
+24°C
9 September
☁️
+25°C
10 September
🌧️
+24°C
11 September
☁️
+23°C
12 September
🌧️
+23°C
13 September
☁️
+23°C
14 September
☁️
+23°C
15 September
☁️
+23°C
16 September
☁️
+23°C
17 September
🌧️
+24°C
18 September
☁️
+23°C
19 September
☁️
+24°C
20 September
☁️
+24°C
21 September
☀️
+26°C
22 September
☁️
+25°C
23 September
🌧️
+25°C
24 September
🌧️
+24°C
25 September
🌧️
+23°C
26 September
🌧️
+23°C
27 September
☁️
+24°C
28 September
☁️
+24°C
29 September
☁️
+24°C
30 September
☁️
+24°C
In September 2023 Cairns had 5 sunny days, 18 cloudy days, and 7 rainy days. The average maximum temperature was +24°C, with an absolute maximum of +26°C and a minimum of +23°C. The average humidity was 79%, with a maximum of 100% and a minimum of 45%. The average wind speed was 4 m/s, with a maximum of 10 m/s and a minimum of 0 m/s.
Are you planning a trip in September?

Climate Change over Years

This is how Cairns climate have been changing during last 43 years period.

The climate in Cairns in September has not changed much over the last 43 years.

The average temperature was the lowest in 1982 (+24°C) and the highest in 2013 (+30°C). The driest year was 2002 with only 513 mm of rainfall, and the wettest year was 2023 with 3123 mm.

FAQ

Frequently asked questions about the weather in Cairns in September:

Is September a good time to visit Cairns?

Yes, September is a great time to go to Cairns, the weather couldn’t be better. Be ready to get outside, explore and enjoy. Check what other months that are a good time to visit Cairns.

Can you sunbathe in Cairns in September?

September is warm in Cairns. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.

Can you swim in Cairns in September?

Yes, the water temperature in Cairns in September is considered moderate and enjoyable for most people, averaging around +25°C.

Is Cairns rainy in September?

Cairns is usually dry in September. Plan your packing around outdoor activities and exploring.

Is it sunny in Cairns in September?

Usually, it’s not very sunny in Cairns in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.

Other cities in Australia

Check out the weather for 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.