September weather forecastSheffield, IL
September
Weather in September
The first month of the autumn, September, is still a warm month in Sheffield, Illinois, with temperature in the range of an average high of 74.8°F (23.8°C) and an average low of 56.3°F (13.5°C).Temperature
September's onset sees an average high-temperature of a still moderately hot 74.8°F (23.8°C), exhibiting a slight fluctuation from the previous month. Sheffield records an average low of 56.3°F (13.5°C) throughout the nights in September.Humidity
In September, the average relative humidity is 77%.Rainfall
In Sheffield, in September, during 11.5 rainfall days, 2.05" (52mm) of precipitation is typically accumulated. Throughout the year, in Sheffield, there are 147.2 rainfall days, and 29.17" (741mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall in Sheffield.Daylight
In Sheffield, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:26 am and sunset at 7:31 pm. On the last day of September, sunrise is at 6:55 am and sunset at 6:41 pm CDT.
Sunshine
In September, the average sunshine is 9.2h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: A daily high UV index of 4 in September leads to these guidelines:
Preventative actions are necessary - Recommendations to ward off sunburn are given. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sheffield, IL
- Average high temperature in September: 74.8°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in September: 56.3°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 (16.7°F).
Average pressure in September
Sheffield, IL
- 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 (29.91"Hg).
Average wind speed in September
Sheffield, IL
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in September
Sheffield, IL
- Average humidity in September: 77%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Sheffield, IL
- Average rainfall in September: 2.05"
The wettest month (with the highest rainfall) is May (4.45").
The driest months (with the least rainfall) are January and December (1.42").
Average rainfall days in September
Sheffield, IL
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (5.6 days).
Average snowfall in September
Sheffield, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.66").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Sheffield, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Sheffield, IL
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 9h and 12min
The months with the most sunshine are June and July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Sheffield, IL
- Average sunshine days in September: 16.2 days
The month with the most sunshine days is November (18 days).
The month with the least sunshine days is June (10.2 days).
Average UV index in September
Sheffield, IL
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Sheffield, IL
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 58).
The months with the least cloud cover are August and September (Cloud cover 30).
Average visibility in September
Sheffield, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
