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 snowfall in September
- Average snowfall days 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
The transition into September is accompanied by a slight temperature decrease, with the average high-temperature shifting from a moderately hot 80.2°F (26.8°C) in August to a pleasant 73.2°F (22.9°C). September nights in South Windham cool down to an average low-temperature of 55.4°F (13°C).Humidity
The average relative humidity in September in South Windham, Connecticut, is 78%.Rainfall
The month with the least rainfall in South Windham is September, when the rain falls for 13.5 days and typically collects 1.73" (44mm) of precipitation.Snowfall
In South Windham, Connecticut, snow does not fall in June through October.Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 6:15 am and sunset at 7:21 pm. On the last day of September, sunrise is at 6:45 am and sunset at 6:31 pm EDT.
Sunshine
In South Windham, the average sunshine in September is 8.6h.UV index
In South Windham, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 4 in September translates into this advice:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Frequently asked questions
What is the temperature in September in South Windham?
What is the average humidity in September in South Windham?
What is the driest month in South Windham?
How much does it rain in South Windham in September?
When it does not snow in South Windham?
How many hours of daylight does South Windham have in September?
When are sunrise and sunset in September in South Windham?
How many hours of sunshine does South Windham have in September?
What is the UV index reading in September in South Windham?
Average temperature in September
South Windham, CT
- Average high temperature in September: 73.2°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in September: 55.4°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in September
South Windham, CT
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
South Windham, CT
- Average wind speed in September: 6.2mph
The windiest months (with the highest average wind speed) are January and March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity in September
South Windham, CT
- Average humidity in September: 78%
The months with the highest relative humidity are February and October (79%).
The month with the lowest relative humidity is April (72%).
Average rainfall in September
South Windham, CT
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is December (3.46").
The driest month (with the least rainfall) is September (1.73").
Average rainfall days in September
South Windham, CT
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (9.1 days).
Average snowfall in September
South Windham, CT
- Average snowfall in September: 0"
The month with the highest snowfall is March (4.41").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
South Windham, CT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
South Windham, CT
- Average daylight in September: 12h and 3min
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 12min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 42min).
Average sunshine days in September
South Windham, CT
- Average sunshine days in September: 14.6 days
The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is June (10.8 days).
Average UV index in September
South Windham, CT
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
South Windham, CT
- Average cloud cover in September: 37
The months with the most cloud cover are February, March, May and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
South Windham, CT
- Average visibility in September: 5mi
The months with the highest visibility are January, March, April, October, November and December (6mi).
The months with the lowest visibility are February, May, June, July, August and September (5mi).
South Windham, Connecticut, USA
Weather forecast for your location
2. Allow the app to use your location
