September weather forecastBlue Mound, IL
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Blue Mound, Illinois, with temperature in the range of an average high of 77.2°F (25.1°C) and an average low of 58.5°F (14.7°C).Temperature
Blue Mound's weather in September displays an average high-temperature of a still moderately hot 77.2°F (25.1°C), showing minor disparity from August's 81.5°F (27.5°C). During the nights in September, the temperature averages to a refreshing 58.5°F (14.7°C).Humidity
In September, the average relative humidity is 75%.Rainfall
In Blue Mound, in September, during 11.5 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. In Blue Mound, Illinois, during the entire year, the rain falls for 139.6 days and collects up to 24.25" (616mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:25 am and sunset at 7:27 pm. On the last day of September, sunrise is at 6:52 am and sunset at 6:40 pm CDT.
Sunshine
In Blue Mound, the average sunshine in September is 9.1h.UV index
In Blue Mound, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In September, a daily UV index of 5 turns into the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Blue Mound, 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 (33.6°F).
- Average low temperature in September: 58.5°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in September
Blue Mound, 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
Blue Mound, IL
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).
Average humidity in September
Blue Mound, IL
- Average humidity in September: 75%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Blue Mound, IL
- Average rainfall in September: 1.5"
The wettest months (with the highest rainfall) are April and May (2.91").
The driest months (with the least rainfall) are February and December (1.38").
Average rainfall days in September
Blue Mound, IL
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (6.9 days).
Average snowfall in September
Blue Mound, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.8").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Blue Mound, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.6 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
Blue Mound, 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 6min
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
Blue Mound, IL
- Average sunshine days in September: 17.4 days
The month with the most sunshine days is October (19.7 days).
The month with the least sunshine days is May (11.6 days).
Average UV index in September
Blue Mound, 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
Blue Mound, IL
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are June and September (Cloud cover 30).
Average visibility in September
Blue Mound, 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).
