September weather forecastThornhill, Canada
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Thornhill, Canada, with an average temperature ranging between max 20.7°C (69.3°F) and min 13.6°C (56.5°F).Temperature
September's onset brings a negligible change in high-temperatures, falling from a moderately hot 24.6°C (76.3°F) in August to an agreeable 20.7°C (69.3°F). An average low-temperature of 13.6°C (56.5°F) is observed in Thornhill during the September nights.Humidity
The average relative humidity in September in Thornhill, Canada, is 76%.Rainfall
In Thornhill, in September, during 12.7 rainfall days, 30mm (1.18") of precipitation is typically accumulated. In Thornhill, during the entire year, the rain falls for 136.9 days and collects up to 456mm (17.95") of precipitation.Snowfall
May through September are months without snowfall in Thornhill.Daylight
In September, the average length of the day is 12h and 29min.On the first day of September in Thornhill, sunrise is at 6:42 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:00 pm EDT.
Sunshine
In Thornhill, the average sunshine in September is 9.4h.UV index
In Thornhill, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.Note: In September, a regular UV index of 4 translates into these guidelines:
Guard yourself - Avoiding sunburn is suggested. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Thornhill, Canada
- Average high temperature in September: 20.7°C
The warmest month (with the highest average high temperature) is July (25.1°C).
The month with the lowest average high temperature is January (-2.7°C).
- Average low temperature in September: 13.6°C
The month with the highest average low temperature is July (17.4°C).
The coldest month (with the lowest average low temperature) is January (-8°C).
Average pressure in September
Thornhill, Canada
- Average pressure in September: 1017mbar
The month with the highest atmospheric pressure is March (1018.3mbar).
The month with the lowest atmospheric pressure is June (1013.1mbar).
Average wind speed in September
Thornhill, Canada
- Average wind speed in September: 12.6km/h
The windiest month (with the highest average wind speed) is January (17.8km/h).
The calmest month (with the lowest average wind speed) is July (11km/h).
Average humidity in September
Thornhill, Canada
- Average humidity in September: 76%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are April, July and August (75%).
Average rainfall in September
Thornhill, Canada
- Average rainfall in September: 30mm
The wettest month (with the highest rainfall) is July (60mm).
The driest month (with the least rainfall) is February (23mm).
Average rainfall days in September
Thornhill, Canada
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is July (16.7 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in September
Thornhill, Canada
- Average snowfall in September: 0mm
The month with the highest snowfall is February (82mm).
The months with the least snowfall are May, June, July, August and September (0mm).
Average snowfall days in September
Thornhill, Canada
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Thornhill, Canada
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 9h and 24min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in September
Thornhill, Canada
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is December (16.9 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in September
Thornhill, Canada
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Thornhill, Canada
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 67).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility in September
Thornhill, Canada
- Average visibility in September: 10km
The months with the highest visibility are August, September and October (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, November and December (9km).
