September weather forecastMount Carroll, IL
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Mount Carroll, Illinois, with an average temperature ranging between max 73°F (22.8°C) and min 54.5°F (12.5°C).Temperature
The arrival of September correlates with a minor temperature reduction, down from August's warm 79.2°F (26.2°C) to a pleasant 73°F (22.8°C). Mount Carroll, during the month of September, experiences an average low-temperature of 54.5°F (12.5°C).Humidity
The average relative humidity in September is 79%.Rainfall
In Mount Carroll, Illinois, in September, during 9.7 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. Throughout the year, there are 123.8 rainfall days, and 17.05" (433mm) of precipitation is accumulated.Snowfall
In Mount Carroll, snow does not fall in May through September.Daylight
The average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:26 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:42 pm CDT.
Sunshine
In September, the average sunshine is 8.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Guard yourself - An obligation to protect skin and eyes from harm exists. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mount Carroll, IL
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in September
Mount Carroll, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Mount Carroll, IL
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in September
Mount Carroll, IL
- Average humidity in September: 79%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Mount Carroll, IL
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is May (2.52").
The driest months (with the least rainfall) are January and February (0.67").
Average rainfall days in September
Mount Carroll, IL
- Average rainfall days in September: 9.7 days
The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is February (3.9 days).
Average snowfall in September
Mount Carroll, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.48").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Mount Carroll, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.6 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
Mount Carroll, IL
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 54min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January and February (Average sunshine: 3h and 42min).
Average sunshine days in September
Mount Carroll, IL
- Average sunshine days in September: 18.9 days
The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is June (11.1 days).
Average UV index in September
Mount Carroll, IL
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Mount Carroll, IL
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in September
Mount Carroll, IL
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
