September weather forecastThornleigh, Australia
September
Weather in September
The first month of the spring, September, is a pleasant month in Thornleigh, Australia, with temperature in the range of an average low of 10.6°C (51.1°F) and an average high of 21.6°C (70.9°F).Temperature
As August transitions into September, Thornleigh notices a gentle rise in the average high-temperature, transitioning from a comfortable 18.3°C (64.9°F) to a pleasant 21.6°C (70.9°F). Thornleigh's September nights cool down to an average low-temperature of 10.6°C (51.1°F).Humidity
September is the least humid month, with an average relative humidity of 65%.Rainfall
In Thornleigh, during September, the rain falls for 9.1 days and regularly aggregates up to 29mm (1.14") of precipitation. Throughout the year, in Thornleigh, there are 149.1 rainfall days, and 546mm (21.5") of precipitation is accumulated.Daylight
The average length of the day in September in Thornleigh is 11h and 53min.On the first day of the month, sunrise is at 6:13 am and sunset at 5:37 pm. On the last day of September, in Thornleigh, sunrise is at 5:33 am and sunset at 5:57 pm AEST.
Sunshine
The average sunshine in September is 8.6h.UV index
The months with the lowest UV index are May through September, with an average maximum UV index of 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: A maximum UV index of 4 in September translates into the following recommendations:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Thornleigh, Australia
- Average high temperature in September: 21.6°C
The warmest month (with the highest average high temperature) is January (29.2°C).
The month with the lowest average high temperature is June (16.8°C).
- Average low temperature in September: 10.6°C
The month with the highest average low temperature is January (18.8°C).
The coldest month (with the lowest average low temperature) is July (8.1°C).
Average pressure in September
Thornleigh, Australia
- Average pressure in September: 1017.2mbar
The month with the highest atmospheric pressure is June (1021mbar).
The month with the lowest atmospheric pressure is January (1012.9mbar).
Average wind speed in September
Thornleigh, Australia
- Average wind speed in September: 10.1km/h
The windiest month (with the highest average wind speed) is December (10.2km/h).
The calmest month (with the lowest average wind speed) is April (8.8km/h).
Average humidity in September
Thornleigh, Australia
- Average humidity in September: 65%
The month with the highest relative humidity is June (76%).
The month with the lowest relative humidity is September (65%).
Average rainfall in September
Thornleigh, Australia
- Average rainfall in September: 29mm
The wettest month (with the highest rainfall) is February (87mm).
The driest month (with the least rainfall) is May (27mm).
Average rainfall days in September
Thornleigh, Australia
- Average rainfall days in September: 9.1 days
The month with the highest number of rainy days is March (17.6 days).
The month with the least rainy days is August (7.9 days).
Average daylight in September /
Average sunshine in September
Thornleigh, 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: 10h and 0min).
- Average sunshine in September: 8h and 36min
The months with the most sunshine are November and December (Average sunshine: 9h and 24min).
The month with the least sunshine is June (Average sunshine: 5h and 48min).
Average sunshine days in September
Thornleigh, Australia
- Average sunshine days in September: 19.5 days
The month with the most sunshine days is August (21 days).
The month with the least sunshine days is February (10.4 days).
Average UV index in September
Thornleigh, 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
Thornleigh, Australia
- Average cloud cover in September: 28
The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in September
Thornleigh, Australia
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
