September weather forecastChesterfield, IN
September
Weather in September
The first month of the autumn, September, is still a warm month in Chesterfield, Indiana, with temperature in the range of an average low of 56.8°F (13.8°C) and an average high of 74.3°F (23.5°C).Temperature
September brings a minor shift in the average high-temperature, adjusting from a warm 79.9°F (26.6°C) in August to a still moderately hot 74.3°F (23.5°C). During September, Chesterfield consistently records a temperature low averaging a moderate 56.8°F (13.8°C).Humidity
In Chesterfield, Indiana, the average relative humidity in September is 78%.Rainfall
In September, the rain falls for 13.2 days. Throughout September, 1.54" (39mm) of precipitation is accumulated. Throughout the year, there are 146.5 rainfall days, and 22.32" (567mm) of precipitation is accumulated.Snowfall
In Chesterfield, snow does not fall in May through September.Daylight
In Chesterfield, the average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 7:10 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 7:38 am and sunset at 7:25 pm EDT.
Sunshine
The average sunshine in September in Chesterfield is 8.2h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In September, the maximum UV index of 4 transforms into these recommendations:
Make use of precautions - Shielding skin and eyes from injury is a requirement. To guard against the harmful effects of the Sun, minimize exposure during midday. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chesterfield, IN
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (32.2°F).
- Average low temperature in September: 56.8°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).
Average pressure in September
Chesterfield, IN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Chesterfield, IN
- Average wind speed in September: 6.8mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in September
Chesterfield, IN
- Average humidity in September: 78%
The months with the highest relative humidity are January and December (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Chesterfield, IN
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is May (2.8").
The driest month (with the least rainfall) is February (1.22").
Average rainfall days in September
Chesterfield, IN
- Average rainfall days in September: 13.2 days
The month with the highest number of rainy days is May (18.1 days).
The month with the least rainy days is February (6.3 days).
Average snowfall in September
Chesterfield, IN
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.24").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Chesterfield, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (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, IN
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 8h and 12min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Chesterfield, IN
- Average sunshine days in September: 14.3 days
The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is May (10.7 days).
Average UV index in September
Chesterfield, IN
- 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, October, November and December (UV index 2).
Average cloud cover in September
Chesterfield, IN
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Chesterfield, IN
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
