September weather forecastGreenwich, Australia

September

Weather in September

The first month of the spring, September, is a pleasant month in Greenwich, Australia, with an average temperature ranging between max 20.6°C (69.1°F) and min 12.2°C (54°F).

Temperature

September experiences an average high-temperature of a pleasant 20.6°C (69.1°F), barely different from August's 17.8°C (64°F). The average temperature during September nights in Greenwich is registered at a fresh 12.2°C (54°F).

Humidity

August and September, with an average relative humidity of 66%, are the least humid months.

Rainfall

September is the month with the least rainfall. Rain falls for 10.5 days and accumulates 35mm (1.38") of precipitation.

Sea temperature

September is the month with the coldest seawater, with an average sea temperature of 18.6°C (65.5°F).
Note: For the majority, swimming in water with a temperature of 18.6°C (65.5°F) is not enjoyable. The difficulty in managing breathing rises as the temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

In September, the average length of the day is 11h and 53min.
On the first day of September, sunrise is at 6:13 am and sunset at 5:37 pm. On the last day of the month, sunrise is at 5:33 am and sunset at 5:57 pm AEST.

Sunshine

In September, the average sunshine is 8.8h.

UV index

May through September, with an average maximum UV index of 4, are months with the lowest UV index in Greenwich. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: An average UV index of 4 in September transforms into this advice:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.

Updated: Jan 27, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The average high-temperature, in September, in Greenwich, is 20.6°C (69.1°F), while the average low-temperature is 12.2°C (54°F). The average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, in January is calculated to be 30°C (86°F).

August and September, with an average relative humidity of 66%, are the least humid months.

In September, the average relative humidity in Greenwich, Australia, is 66%.

September is the month with the least rainfall in Greenwich, Australia. Rain falls for 10.5 days and accumulates 35mm (1.38") of precipitation.

In Greenwich, Australia, during September, the rain falls for 10.5 days and regularly aggregates up to 35mm (1.38") of precipitation.

The month with the coldest seawater in Greenwich, Australia, is September, with an average sea temperature of 18.6°C (65.5°F).

In Greenwich, Australia, in September, the average water temperature is 18.6°C (65.5°F). For swimming, a surface water temperature of 18.6°C (65.5°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

In September, the average day length in Greenwich, Australia, is 11h and 53min.

In September, on the first day of the month, sunrise is at 6:13 am and sunset at 5:37 pm. On the last day of the month, in Greenwich, Australia, sunrise is at 5:33 am and sunset at 5:57 pm AEST.

In Greenwich, Australia, the average sunshine duration in September is 8.8h.

May through September, with an average maximum UV index of 4, are months with the lowest UV index in Greenwich.

In Greenwich, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health risk from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

17.8°C

20.6°C

22.4°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

15.1km/h

14.6km/h

14.9km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

10.1

10.5

13.5

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

17.9

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Greenwich, Australia

Average high temperature in September: 20.6°C

The warmest month (with the highest average high temperature) is January (27.3°C).
The month with the lowest average high temperature is July (16.6°C).

Average low temperature in September: 12.2°C

The month with the highest average low temperature is January (19.8°C).
The coldest month (with the lowest average low temperature) is July (9.7°C).

Average pressure in September
Greenwich, Australia

Average pressure in September: 1017.2mbar

The month with the highest atmospheric pressure is June (1020.9mbar).
The month with the lowest atmospheric pressure is January (1012.9mbar).

Average wind speed in September
Greenwich, Australia

Average wind speed in September: 13.9km/h

The windiest months (with the highest average wind speed) are January and August (14km/h).
The calmest month (with the lowest average wind speed) is April (12.2km/h).

Average humidity in September
Greenwich, Australia

Average humidity in September: 66%

The month with the highest relative humidity is February (75%).
The months with the lowest relative humidity are August and September (66%).

Average rainfall in September
Greenwich, Australia

Average rainfall in September: 35mm

The wettest month (with the highest rainfall) is February (92mm).
The driest month (with the least rainfall) is September (35mm).

Average rainfall days in September
Greenwich, Australia

Average rainfall days in September: 10.5 days

The month with the highest number of rainy days is March (18.8 days).
The month with the least rainy days is August (10.1 days).

Average sea temperature in September
Greenwich, Australia

Average sea temperature in September: 18.6°C

The best month for swimming (with the highest average sea temperature) is February (23.7°C).
The coldest month (with the lowest average sea temperature) is September (18.6°C).

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

Average daylight in September: 11h and 54min

The month with the longest days is December (Average daylight: 14h and 24min).
The month with the shortest days is June (Average daylight: 9h and 54min).

Average sunshine in September: 8h and 48min

The month with the most sunshine is November (Average sunshine: 9h and 48min).
The month with the least sunshine is June (Average sunshine: 5h and 54min).

Average sunshine days in September
Greenwich, Australia

Average sunshine days in September: 17 days

The month with the most sunshine days is August (17.9 days).
The month with the least sunshine days is March (8.8 days).

Average UV index in September
Greenwich, Australia

Average UV index in September: 4

The months with the highest UV index are January, February, November and December (UV index 6).
The months with the lowest UV index are May, June, July, August and September (UV index 4).

Average cloud cover in September
Greenwich, Australia

Average cloud cover in September: 26

The month with the most cloud cover is February (Cloud cover 42).
The month with the least cloud cover is August (Cloud cover 24).

Average visibility in September
Greenwich, Australia

Average visibility in September: 10km

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