September weather forecastDeerfield, WI
September
Weather in September
September, the first month of the autumn in Deerfield, is still a pleasant month, with an average temperature varying between 71.4°F (21.9°C) and 52°F (11.1°C).Temperature
Deerfield's September weather features a light decline in high-temperatures, reducing from a warm 77.4°F (25.2°C) in August to a pleasant 71.4°F (21.9°C). In September, the average low-temperature in Deerfield records at a fresh 52°F (11.1°C) during the nights.Humidity
In Deerfield, the average relative humidity in September is 81%.Rainfall
In Deerfield, in September, it is raining for 11.9 days, with typically 2.32" (59mm) of accumulated precipitation. Throughout the year, there are 134.9 rainfall days, and 26.34" (669mm) of precipitation is accumulated.Snowfall
In Deerfield, snow does not fall in June through September.Daylight
In Deerfield, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:21 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:38 pm CDT.
Sunshine
The average sunshine in September is 8.5h.UV index
The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: An average maximum UV index of 3 in September leads to these recommendations:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Deerfield, WI
- Average high temperature in September: 71.4°F
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (24.1°F).
- Average low temperature in September: 52°F
The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (11.7°F).
Average pressure in September
Deerfield, WI
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Deerfield, WI
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is April (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in September
Deerfield, WI
- Average humidity in September: 81%
The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is April (76%).
Average rainfall in September
Deerfield, WI
- Average rainfall in September: 2.32"
The wettest month (with the highest rainfall) is June (3.5").
The driest months (with the least rainfall) are January and February (1.1").
Average rainfall days in September
Deerfield, WI
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (4 days).
Average snowfall in September
Deerfield, WI
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.41").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Deerfield, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Deerfield, WI
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 30min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in September
Deerfield, WI
- Average sunshine days in September: 16.2 days
The month with the most sunshine days is December (17.5 days).
The month with the least sunshine days is June (10.7 days).
Average UV index in September
Deerfield, WI
- Average UV index in September: 3
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, November and December (UV index 1).
Average cloud cover in September
Deerfield, WI
- Average cloud cover in September: 36
The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in September
Deerfield, WI
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
