September weather forecastChester, MA
September
Weather in September
September, the first month of the autumn in Chester, is also an agreeable month, with an average temperature varying between 52.5°F (11.4°C) and 70.7°F (21.5°C).Temperature
The onset of September is marked by a minor decrease in temperature, transitioning from a moderately hot 77.7°F (25.4°C) in August to an agreeable 70.7°F (21.5°C). Nighttime temperature dips to a mean of 52.5°F (11.4°C) during September.Humidity
The average relative humidity in September is 80%.Rainfall
September is the month with the least rainfall. Rain falls for 13.1 days and accumulates 2.13" (54mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September, sunrise is at 6:17 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:34 pm EDT.
Sunshine
The average sunshine in September is 8.3h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Make use of precautions - Shielding skin and eyes from injury is a requirement. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chester, MA
- Average high temperature in September: 70.7°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (28.9°F).
- Average low temperature in September: 52.5°F
The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure in September
Chester, MA
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Chester, MA
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is January (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in September
Chester, MA
- Average humidity in September: 80%
The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is April (74%).
Average rainfall in September
Chester, MA
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is October (3.35").
The driest month (with the least rainfall) is September (2.13").
Average rainfall days in September
Chester, MA
- Average rainfall days in September: 13.1 days
The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is February (6.8 days).
Average snowfall in September
Chester, MA
- Average snowfall in September: 0"
The month with the highest snowfall is February (7.87").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Chester, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (12.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Chester, MA
- 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 months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 6min).
Average sunshine days in September
Chester, MA
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is June (11.8 days).
Average UV index in September
Chester, MA
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Chester, MA
- Average cloud cover in September: 42
The month with the most cloud cover is February (Cloud cover 54).
The months with the least cloud cover are July and August (Cloud cover 38).
Average visibility in September
Chester, MA
- Average visibility in September: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
