Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
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.
Frequently asked questions
What is the temperature in September in Greenwich?
What are the least humid months in Greenwich?
What is the average humidity in September in Greenwich?
What is the driest month in Greenwich?
How many days does it rain in September in Greenwich?
What month is the sea coldest in Greenwich?
What is the sea water temperature in September in Greenwich?
What is the average length of the day in September in Greenwich?
When are sunrise and sunset in September in Greenwich?
How long on average sun shines in September in Greenwich?
What are the months with the lowest UV index in Greenwich?
How high is the UV index in September in Greenwich?
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 5min
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 5min
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).
Greenwich, Australia
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