September weather forecastSidell, IL
September
Weather in September
The first month of the autumn, September, is still a warm month in Sidell, Illinois, with an average temperature varying between 77.2°F (25.1°C) and 58.6°F (14.8°C).Temperature
The shift into September records an average high-temperature of a still warm 77.2°F (25.1°C), subtly varied from August's 81.1°F (27.3°C). In Sidell, the average temperature during the nights of September drops to a refreshing 58.6°F (14.8°C).Humidity
The average relative humidity in September is 76%.Rainfall
In Sidell, Illinois, in September, during 11 rainfall days, 1.1" (28mm) of precipitation is typically accumulated. In Sidell, during the entire year, the rain falls for 133.4 days and collects up to 19.49" (495mm) of precipitation.Snowfall
In Sidell, snow does not fall in May through October.Daylight
In Sidell, the average length of the day in September is 12h and 26min.On the first day of September in Sidell, sunrise is at 6:19 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:34 pm CDT.
Sunshine
The average sunshine in September is 9h.UV index
The average daily maximum UV index in September in Sidell is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 5 in September translates into this advice:
Exercise prevention - Protecting skin and eyes from harm is required. To avoid the Sun's strongest rays, limit exposure around the mid-day period. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sidell, IL
- Average high temperature in September: 77.2°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (33.8°F).
- Average low temperature in September: 58.6°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (21.7°F).
Average pressure in September
Sidell, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Sidell, IL
- Average wind speed in September: 6.9mph
The windiest months (with the highest average wind speed) are January and February (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.1mph).
Average humidity in September
Sidell, IL
- Average humidity in September: 76%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Sidell, IL
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is April (2.76").
The driest month (with the least rainfall) is February (0.94").
Average rainfall days in September
Sidell, IL
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (6.3 days).
Average snowfall in September
Sidell, IL
- Average snowfall in September: 0"
The month with the highest snowfall is December (1.61").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Sidell, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.9 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
Sidell, IL
- 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: 9h and 0min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in September
Sidell, IL
- Average sunshine days in September: 17.2 days
The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in September
Sidell, IL
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Sidell, IL
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are June, August and September (Cloud cover 31).
Average visibility in September
Sidell, 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).
