September weather forecastChatham, Canada
September
Weather in September
September, the first month of the autumn in Chatham, is still a pleasant month, with an average temperature fluctuating between 13.8°C (56.8°F) and 21.5°C (70.7°F).Temperature
September's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from August's moderately hot 24.8°C (76.6°F) to a pleasant 21.5°C (70.7°F). In Chatham, September is marked by an average low-temperature of 13.8°C (56.8°F).Humidity
In Chatham, the average relative humidity in September is 78%.Rainfall
In Chatham, in September, during 13.3 rainfall days, 46mm (1.81") of precipitation is typically accumulated. Throughout the year, in Chatham, there are 155.6 rainfall days, and 650mm (25.59") of precipitation is accumulated.Snowfall
In Chatham, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:54 am and sunset at 8:02 pm. On the last day of September, in Chatham, sunrise is at 7:25 am and sunset at 7:11 pm EDT.
Sunshine
In September, the average sunshine in Chatham is 8.3h.UV index
In Chatham, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 4 transforms into these recommendations:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chatham, Canada
- Average high temperature in September: 21.5°C
The warmest month (with the highest average high temperature) is July (25.4°C).
The month with the lowest average high temperature is January (-1.9°C).
- Average low temperature in September: 13.8°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 (-7°C).
Average pressure in September
Chatham, Canada
- Average pressure in September: 1017.2mbar
The month with the highest atmospheric pressure is November (1018.9mbar).
The month with the lowest atmospheric pressure is June (1013.5mbar).
Average wind speed in September
Chatham, Canada
- Average wind speed in September: 13km/h
The windiest month (with the highest average wind speed) is January (17.6km/h).
The calmest month (with the lowest average wind speed) is July (11.1km/h).
Average humidity in September
Chatham, Canada
- Average humidity in September: 78%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are April, May and October (76%).
Average rainfall in September
Chatham, Canada
- Average rainfall in September: 46mm
The wettest month (with the highest rainfall) is May (76mm).
The driest months (with the least rainfall) are January and February (36mm).
Average rainfall days in September
Chatham, Canada
- Average rainfall days in September: 13.3 days
The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is February (6.9 days).
Average snowfall in September
Chatham, Canada
- Average snowfall in September: 0mm
The month with the highest snowfall is February (108mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Chatham, Canada
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Chatham, Canada
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in September
Chatham, Canada
- Average sunshine days in September: 14.6 days
The month with the most sunshine days is September (14.6 days).
The month with the least sunshine days is January (10.2 days).
Average UV index in September
Chatham, Canada
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Chatham, Canada
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Chatham, Canada
- Average visibility in September: 9km
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (9km).
The month with the lowest visibility is January (8km).
