September weather forecastSterling, CT
September
Weather in September
September, the first month of the autumn in Sterling, is still a pleasant month, with an average temperature ranging between max 72.5°F (22.5°C) and min 55.9°F (13.3°C).Temperature
With the arrival of September, Sterling experiences a modest decline in average high-temperatures, transitioning from a warm 79.7°F (26.5°C) in August to a pleasant 72.5°F (22.5°C). Sterling's nighttime temperature during September is consistently averaged at a mild 55.9°F (13.3°C).Humidity
The months with the highest humidity in Sterling, Connecticut, are February, June, July and September, with an average relative humidity of 79%.Rainfall
September is the month with the least rainfall. Rain falls for 13.4 days and accumulates 1.73" (44mm) of precipitation.Snowfall
In Sterling, snow does not fall in June through October.Daylight
In Sterling, the average length of the day in September is 12h and 28min.On the first day of September in Sterling, sunrise is at 6:14 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:30 pm EDT.
Sunshine
In Sterling, Connecticut, the average sunshine in September is 8.5h.UV index
In Sterling, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: In September, an average UV index of 4 transforms into the following instructions:
Take precautions - Protection against skin and eye damage is obliged. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sterling, CT
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (34°F).
- Average low temperature in September: 55.9°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).
Average pressure in September
Sterling, 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
Sterling, CT
- Average wind speed in September: 6.8mph
The windiest months (with the highest average wind speed) are January and March (9.4mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in September
Sterling, CT
- Average humidity in September: 79%
The months with the highest relative humidity are February, June, July and September (79%).
The month with the lowest relative humidity is April (72%).
Average rainfall in September
Sterling, CT
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is December (3.39").
The driest month (with the least rainfall) is September (1.73").
Average rainfall days in September
Sterling, CT
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in September
Sterling, CT
- Average snowfall in September: 0"
The month with the highest snowfall is March (3.62").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Sterling, CT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (7.7 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
Sterling, CT
- 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 12min).
- Average sunshine in September: 8h and 30min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in September
Sterling, CT
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in September
Sterling, 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
Sterling, CT
- Average cloud cover in September: 37
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Sterling, CT
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, September, October, November and December (6mi).
The months with the lowest visibility are May, June, July and August (5mi).
