September weather forecastChesterfield, MA
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Chesterfield, Massachusetts, with temperature in the range of an average high of 71.1°F (21.7°C) and an average low of 51.3°F (10.7°C).Temperature
September's arrival comes with a mild decrease in the average high-temperature, moving subtly from a moderately hot 79°F (26.1°C) in August to a pleasant 71.1°F (21.7°C). Throughout September, the average low-temperature dips to a fresh 51.3°F (10.7°C).Humidity
The average relative humidity in September is 78%.Rainfall
In Chesterfield, during September, the rain falls for 10.5 days and regularly aggregates up to 1.65" (42mm) of precipitation. Throughout the year, there are 141.4 rainfall days, and 24.45" (621mm) of precipitation is accumulated.Snowfall
In Chesterfield, snow does not fall in June through September.Daylight
In Chesterfield, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:24 pm. On the last day of September, in Chesterfield, sunrise is at 6:48 am and sunset at 6:34 pm EDT.
Sunshine
In Chesterfield, the average sunshine in September is 8.8h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, a daily UV index of 4 turns into the following recommendations:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chesterfield, MA
- Average high temperature in September: 71.1°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 (28.8°F).
- Average low temperature in September: 51.3°F
The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure in September
Chesterfield, MA
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Chesterfield, MA
- Average wind speed in September: 5.3mph
The windiest months (with the highest average wind speed) are February and March (7.7mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Chesterfield, MA
- Average humidity in September: 78%
The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is April (73%).
Average rainfall in September
Chesterfield, MA
- Average rainfall in September: 1.65"
The wettest month (with the highest rainfall) is October (2.6").
The driest month (with the least rainfall) is August (1.57").
Average rainfall days in September
Chesterfield, MA
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is May (14.6 days).
The month with the least rainy days is January (8.4 days).
Average snowfall in September
Chesterfield, MA
- Average snowfall in September: 0"
The month with the highest snowfall is February (6.3").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Chesterfield, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Chesterfield, 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 48min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in September
Chesterfield, MA
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is January (16.9 days).
The month with the least sunshine days is April (12.7 days).
Average UV index in September
Chesterfield, MA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in September
Chesterfield, MA
- Average cloud cover in September: 36
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Chesterfield, MA
- Average visibility in September: 5mi
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).
