September weather forecastAviston, IL
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Aviston, Illinois, with an average temperature ranging between min 59.9°F (15.5°C) and max 78.8°F (26°C).Temperature
The transition into September shows a subtle variation to a still moderately hot 78.8°F (26°C) from August's 83.8°F (28.8°C) in the average high-temperature. Throughout September nights, Aviston registers an average low-temperature of 59.9°F (15.5°C).Humidity
The average relative humidity in September is 75%.Rainfall
In Aviston, Illinois, during September, the rain falls for 12 days and regularly aggregates up to 1.77" (45mm) of precipitation. Throughout the year, there are 151.1 rainfall days, and 30.43" (773mm) of precipitation is accumulated.Snowfall
In Aviston, snow does not fall in May through September.Daylight
In September, the average length of the day in Aviston is 12h and 25min.On the first day of the month, sunrise is at 6:28 am and sunset at 7:28 pm. On the last day of September, sunrise is at 6:54 am and sunset at 6:42 pm CDT.
Sunshine
In Aviston, the average sunshine in September is 9.3h.UV index
In Aviston, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: The average daily UV index of 5 in September transforms into the following instructions:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Aviston, IL
- Average high temperature in September: 78.8°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.8°F).
- Average low temperature in September: 59.9°F
The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).
Average pressure in September
Aviston, IL
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Aviston, IL
- Average wind speed in September: 6.2mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in September
Aviston, IL
- Average humidity in September: 75%
The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Aviston, IL
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is June (3.66").
The driest month (with the least rainfall) is February (1.5").
Average rainfall days in September
Aviston, IL
- Average rainfall days in September: 12 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (8 days).
Average snowfall in September
Aviston, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.85").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Aviston, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.5 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
Aviston, IL
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 18min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).
Average sunshine days in September
Aviston, IL
- Average sunshine days in September: 15.8 days
The month with the most sunshine days is October (18.8 days).
The month with the least sunshine days is July (11 days).
Average UV index in September
Aviston, IL
- Average UV index in September: 5
The months with the highest UV index are May, 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
Aviston, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility in September
Aviston, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
