September weather forecast
Darwin, Australia

Weather in September

September, the first month of the spring in Darwin, is still a hot month, with an average temperature fluctuating between 24°C (75.2°F) and 31.7°C (89.1°F).

Temperature

In September, the average high-temperature is almost the same as in August - a still hot 31.7°C (89.1°F). In Darwin, Australia, the average low-temperature is 24°C (75.2°F).

Heat index

In September, the average heat index is calculated to be a very hot 38°C (100.4°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'feels like', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, metabolic differences, pregnancy), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in September is 64%.

Rainfall

In Darwin, during 7.4 rainfall days, 14mm (0.55") of precipitation is typically accumulated. In Darwin, Australia, during the entire year, the rain falls for 191.8 days and collects up to 1282mm (50.47") of precipitation.

Sea temperature

In Darwin, in September, the average water temperature is 27.8°C (82°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In Darwin, the average length of the day in September is 12h and 2min.
On the first day of September, sunrise is at 6:50 am and sunset at 6:42 pm. On the last day of the month, sunrise is at 6:30 am and sunset at 6:42 pm ACST.

Sunshine

The average sunshine in September is 9.8h.

UV index

The months with the lowest UV index are January through October and December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in September in Darwin?

The average high-temperature, in September, in Darwin, is 31.7°C (89.1°F), while the average low-temperature is 24°C (75.2°F). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in September is calculated to be 38°C (100.4°F).

What is the average humidity in September in Darwin?

The average relative humidity in September in Darwin is 64%.

How much does it rain in Darwin in September?

In September, the rain falls for 7.4 days. Throughout September, 14mm (0.55") of precipitation is accumulated.

How warm is the water in September in Darwin?

In Darwin, Australia, in September, the average water temperature is 27.8°C (82°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

What is the average length of the day in September in Darwin?

In September, the average day length in Darwin is 12h and 2min.

When are sunrise and sunset in September in Darwin?

In September, on the first day of the month, sunrise is at 6:50 am and sunset at 6:42 pm. On the last day of the month, in Darwin, sunrise is at 6:30 am and sunset at 6:42 pm ACST.

How many hours of sunshine does Darwin have in September?

In September, the average sunshine duration in Darwin, Australia, is 9.8h.

What is the month with the lowest UV index in Darwin?

January through October and December, with an average maximum UV index of 7, are months with the lowest UV index in Darwin, Australia.

What is the UV index intensity in September in Darwin?

In September, the average daily maximum UV index in Darwin is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to Sun's UV rays.

Average temperature in September
Darwin, Australia

Average temperature in September - Darwin, Australia
  • Average high temperature in September: 31.7°C

The warmest month (with the highest average high temperature) is November (33.3°C).
The month with the lowest average high temperature is July (29.4°C).

  • Average low temperature in September: 24°C

The month with the highest average low temperature is December (27.8°C).
The coldest month (with the lowest average low temperature) is July (21.7°C).

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Average pressure in September
Darwin, Australia

Average pressure in September - Darwin, Australia
  • Average pressure in September: 1012.2mbar

The months with the highest atmospheric pressure are July and August (1013.2mbar).
The month with the lowest atmospheric pressure is January (1006.3mbar).

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Average wind speed in September
Darwin, Australia

Average wind speed in September - Darwin, Australia
  • Average wind speed in September: 9.9km/h

The windiest month (with the highest average wind speed) is January (15.3km/h).
The calmest month (with the lowest average wind speed) is September (9.9km/h).

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Average humidity in September
Darwin, Australia

Average humidity in September - Darwin, Australia
  • Average humidity in September: 64%

The months with the highest relative humidity are January and February (78%).
The month with the lowest relative humidity is June (57%).

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Average rainfall in September
Darwin, Australia

Average rainfall in September - Darwin, Australia
  • Average rainfall in September: 14mm

The wettest month (with the highest rainfall) is January (340mm).
The driest months (with the least rainfall) are June, July and August (2mm).

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Average rainfall days in September
Darwin, Australia

Average rainfall days in September - Darwin, Australia
  • Average rainfall days in September: 7.4 days

The month with the highest number of rainy days is January (28.3 days).
The month with the least rainy days is June (1.9 days).

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Average sea temperature in September
Darwin, Australia

Average sea temperature in September - Darwin, Australia
  • Average sea temperature in September: 27.8°C

The best month for swimming (with the highest average sea temperature) is December (31.5°C).
The coldest month (with the lowest average sea temperature) is July (25.8°C).

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Average daylight in September /
Average sunshine in September
Darwin, Australia

Average daylight in September / Average sunshine in September - Darwin, Australia
  • Average daylight in September: 12h and 2min

The month with the longest days is December (Average daylight: 12h and 51min).
The month with the shortest days is June (Average daylight: 11h and 25min).

  • Average sunshine in September: 9h and 48min

The months with the most sunshine are June and August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 7h and 30min).

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Average sunshine days in September
Darwin, Australia

Average sunshine days in September - Darwin, Australia
  • Average sunshine days in September: 20.3 days

The month with the most sunshine days is July (28.4 days).
The month with the least sunshine days is February (0.9 days).

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Average UV index in September
Darwin, Australia

Average UV index in September - Darwin, Australia
  • Average UV index in September: 7

The month with the highest UV index is November (UV index 8).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October and December (UV index 7).

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Average cloud cover in September
Darwin, Australia

Average cloud cover in September - Darwin, Australia
  • Average cloud cover in September: 13

The month with the most cloud cover is January (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 9).

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Average visibility in September
Darwin, Australia

Average visibility in September - Darwin, Australia
  • Average visibility in September: 10km

The months with the highest visibility are April, May, June, July, August, September, October and November (10km).
The months with the lowest visibility are January, February, March and December (9km).

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