Cairns Weather in September

Cairns in September averages 25°C (77°F) during the day and 20°C (68°F) at night. This is the driest month of the year.

Rainfall in Cairns in September

Dry conditions dominate this month. A great time for outdoor fun and exploration. Climate statistics over the past 30 years suggest around 4 days of rain, with 23 mm (0.9 in) average for the month. Rain days are few and the total is low, so this is a largely dry month. Any showers that do occur tend to be brief.

Temperature in Cairns in September

Cairns in September is worth a visit. The temperature is perfect, with 25°C (77°F) during the day and 20°C (68°F) at night. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With lows of 20°C (68°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Cairns in September

Expect a lot of sunshine this month, with about 249 hours of sun. These sunny conditions add to the overall experience.

Average water temperature in September

The water is 24°C (75°F) this month — warm enough that getting in requires no effort at all. Good conditions for swimming, snorkeling, or just floating around.

So this is a great month to visit if you prefer dry days with pleasant temperatures.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Australia, check out our Cairns's climate page.

Cairns Temperature in September

Min Temperature 20°C (68°F)  

Max Temperature 25°C (77°F)  

Water Temperature 24°C (75°F)  

Chance of Rain 12%  

Precipitation 23 mm (0.9 in)  

Rainy days 4 days  

Humidity 55%  

Sunshine 249 hours  

Percentage Sunshine  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Cairns typically stay consistent throughout September, with daily highs averaging around 25°C (77°F). Nights are pleasant, with lows typically ranging from 18°C (64°F) to 20°C (68°F).

Average temperatures in September

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Historical weather for Cairns in September

Browse day-by-day weather records for Cairns spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Cairns historical weather extremes in September

Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Cairns.

• Cairns recorded its highest September temperature of 33°C (91°F) on September 15, 2003.
• The coldest September day was on September 17, 2024, with a maximum of 22°C (72°F).
• The coldest night in September in Cairns was on September 5, 2019, with a minimum of 10°C (50°F).

What to Wear in Cairns in September

Warm but pleasant conditions in Cairns in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Light rain is possible, so consider bringing a small umbrella or rain jacket. With water temperatures around 24°C (75°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Cairns in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

10/10

Cycling

8/10

Walking

8/10

Barbeque

10/10

Camping

10/10

Outdoor sports

8/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Australia, check out our Cairns's climate page.

More climate data for Cairns

Temperature Rainfall Sunshine Humidity Water Temp

See the full Cairns climate overview or explore weather in Australia.