Cairns
Australia
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Cairns, Australia

The first month of the spring, September, is still a warm month in Cairns, Australia, with temperature in the range of an average low of 19.5°C (67.1°F) and an average high of 25.8°C (78.4°F).

Temperature

In September, the average high-temperature is practically the same as in August - a still moderately hot 25.8°C (78.4°F). In September, the average low-temperature is 19.5°C (67.1°F).

Humidity

September and October, with an average relative humidity of 74%, are the least humid months.

Rainfall

The month with the least rainfall in Cairns is September when the rain falls for 7.2 days and typically collects 9mm (0.35") of precipitation.

Sea temperature

In September, the average sea temperature is 24.8°C (76.6°F).
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 24.8°C (76.6°F) water. (FYI: The Olympic swimming competition requires a water temperature between 25°C (77°F) and 28°C (82.4°F).)

Daylight

The average length of the day in Cairns, Australia, is 12h.

Sunshine

In September, the average sunshine in Cairns is 9.1h.

UV index

The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high threat to health from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in September in Cairns?

In September, the average high-temperature is 25.8°C (78.4°F), and the average low-temperature is 19.5°C (67.1°F).

What are the least humid months in Cairns?

September and October, with an average relative humidity of 74%, are the least humid months in Cairns.

What is the average humidity in September in Cairns?

In Cairns, the average relative humidity in September is 74%.

How many days does it rain in September in Cairns?

In Cairns, Australia, in September, during 7.2 rainfall days, 9mm (0.35") of precipitation is typically accumulated.

What is the driest month in Cairns?

The month with the least rainfall is September when the rain falls for 7.2 days and typically collects 9mm (0.35") of precipitation.

How warm is the water in September in Cairns?

In Cairns, Australia, the average seawater temperature in September is 24.8°C (76.6°F). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 24.8°C (76.6°F) water may be enjoyable.

How many hours of daylight does Cairns have in September?

In Cairns, the average length of the day in September is 12h.

How many hours of sunshine does Cairns have in September?

In September, the average sunshine is 9.1h.

What is the UV index reading in September in Cairns?

The average daily maximum UV index in September in Cairns is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from the exposure to the Sun's UV radiation.
Average temperature in September - Cairns, Australia
  • Average high temperature in September: 25.8°C

The warmest month (with the highest average high temperature) is February (29.4°C).
The month with the lowest average high temperature is July (23.2°C).

  • Average low temperature in September: 19.5°C

Months with the highest average low temperature are January and February (24.3°C).
The coldest month (with the lowest average low temperature) is August (18°C).

Average humidity in September - Cairns, Australia
  • Average humidity in September: 74%

The month with the highest relative humidity is March (81%).
Months with the lowest relative humidity are September and October (74%).

Average rainfall in September - Cairns, Australia
  • Average rainfall in September: 9mm

The wettest month (with the highest rainfall) is January (162mm).
The driest month (with the lowest rainfall) is September (9mm).

Average rainfall days in September - Cairns, Australia
  • Average rainfall days in September: 7.2 days

The month with the highest number of rainy days is January (22.4 days).
The month with the lowest number of rainy days is September (7.2 days).

Average sea temperature in September - Cairns, Australia
  • Average sea temperature in September: 24.8°C

The best month for swimming (with the highest average sea temperature) is January (29.5°C).
The coldest month (with the lowest average sea temperature) is July (23.8°C).

Average daylight in September / Average sunshine in September - Cairns, Australia
  • Average daylight in September: 12h

The month with the longest days is December (Average daylight: 13.1h).
The month with shortest days is June (Average daylight: 11.1h).

  • Average sunshine in September: 9.1h

Months with most sunshine are October and November (Average sunshine: 10.8h).
The month with least sunshine is June (Average sunshine: 5.9h).

Average UV index in September - Cairns, Australia
  • Average UV index in September: 6

Months with the highest UV index are January, February and November (UV index 7).
The month with the lowest UV index is July (UV index 5).