September weather forecastShelbyville, IL
September
Weather in September
September, the first month of the autumn in Shelbyville, is also a moderately hot month, with an average temperature ranging between min 58.6°F (14.8°C) and max 77.2°F (25.1°C).Temperature
Shelbyville's shift into September is marked by a subtle change to a still moderately hot 77.2°F (25.1°C) from August's 81.7°F (27.6°C) in temperature. September nights cool down to an average low-temperature of 58.6°F (14.8°C).Humidity
The average relative humidity in September is 75%.Rainfall
In Shelbyville, in September, during 9.9 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. In Shelbyville, during the entire year, the rain falls for 116.5 days and collects up to 11.54" (293mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
In Shelbyville, the average length of the day in September is 12h and 26min.On the first day of September in Shelbyville, sunrise is at 6:24 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:38 pm CDT.
Sunshine
In Shelbyville, the average sunshine in September is 9h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: A typical high UV index of 5 in September suggests the following recommendations:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. It's recommended to limit sun exposure when its radiation is at its peak during midday. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Shelbyville, IL
- Average high temperature in September: 77.2°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (34.3°F).
- Average low temperature in September: 58.6°F
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).
Average pressure in September
Shelbyville, 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 (29.92"Hg).
Average wind speed in September
Shelbyville, IL
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in September
Shelbyville, IL
- Average humidity in September: 75%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Shelbyville, IL
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is June (1.46").
The driest month (with the least rainfall) is February (0.55").
Average rainfall days in September
Shelbyville, IL
- Average rainfall days in September: 9.9 days
The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is February (4.9 days).
Average snowfall in September
Shelbyville, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.83").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Shelbyville, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (5.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Shelbyville, IL
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
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 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Shelbyville, IL
- Average sunshine days in September: 18.6 days
The month with the most sunshine days is December (22.1 days).
The month with the least sunshine days is June (13.5 days).
Average UV index in September
Shelbyville, IL
- Average UV index in September: 5
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, November and December (UV index 2).
Average cloud cover in September
Shelbyville, IL
- Average cloud cover in September: 30
The months with the most cloud cover are January and February (Cloud cover 55).
The months with the least cloud cover are June and September (Cloud cover 30).
Average visibility in September
Shelbyville, IL
- 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).
