September weather forecastChalk River, Canada
September
Weather in September
September, the first month of the autumn in Chalk River, is still a comfortable month, with an average temperature fluctuating between 8.9°C (48°F) and 19.6°C (67.3°F).Temperature
September signals a slight drop in average high-temperature, sliding from August's warm 24.2°C (75.6°F) to a refreshing 19.6°C (67.3°F). Throughout September, Chalk River's nights cool down to an average of 8.9°C (48°F).Humidity
In Chalk River, the average relative humidity in September is 79%.Rainfall
In September, in Chalk River, Canada, the rain falls for 11.3 days. Throughout September, 40mm (1.57") of precipitation is accumulated. In Chalk River, during the entire year, the rain falls for 126 days and collects up to 575mm (22.64") of precipitation.Snowfall
In Chalk River, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 32min.On the first day of September in Chalk River, Canada, sunrise is at 6:31 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:51 pm EDT.
Sunshine
In Chalk River, the average sunshine in September is 8.3h.UV index
In Chalk River, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: A daily maximum UV index of 3 in September translates into the following instructions:
Undertake protective steps - Recommendations to avoid sunburn are issued. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chalk River, Canada
- Average high temperature in September: 19.6°C
The warmest month (with the highest average high temperature) is July (25.8°C).
The month with the lowest average high temperature is January (-6.8°C).
- Average low temperature in September: 8.9°C
The month with the highest average low temperature is July (13.3°C).
The coldest month (with the lowest average low temperature) is January (-15.1°C).
Average pressure in September
Chalk River, Canada
- Average pressure in September: 1016.9mbar
The month with the highest atmospheric pressure is March (1018.3mbar).
The month with the lowest atmospheric pressure is June (1012.5mbar).
Average wind speed in September
Chalk River, Canada
- Average wind speed in September: 9.3km/h
The windiest month (with the highest average wind speed) is April (12km/h).
The calmest month (with the lowest average wind speed) is August (9.1km/h).
Average humidity in September
Chalk River, Canada
- Average humidity in September: 79%
The months with the highest relative humidity are January and February (92%).
The month with the lowest relative humidity is May (69%).
Average rainfall in September
Chalk River, Canada
- Average rainfall in September: 40mm
The wettest month (with the highest rainfall) is April (68mm).
The driest month (with the least rainfall) is November (37mm).
Average rainfall days in September
Chalk River, Canada
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is August (14.8 days).
The month with the least rainy days is February (3.9 days).
Average snowfall in September
Chalk River, Canada
- Average snowfall in September: 0mm
The month with the highest snowfall is January (239mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Chalk River, Canada
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (17.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Chalk River, Canada
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 8h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 1h and 54min).
Average sunshine days in September
Chalk River, Canada
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is September (16.3 days).
The month with the least sunshine days is February (11.3 days).
Average UV index in September
Chalk River, Canada
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in September
Chalk River, Canada
- Average cloud cover in September: 42
The months with the most cloud cover are January and February (Cloud cover 77).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in September
Chalk River, Canada
- Average visibility in September: 8km
The months with the highest visibility are May, June and July (9km).
The months with the lowest visibility are January and February (6km).
