Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Donnellson's weather in September displays an average high-temperature of a still warm 77.7°F (25.4°C), showing minor disparity from August's 82.6°F (28.1°C). During September, Donnellson consistently records a temperature low averaging a moderate 59.2°F (15.1°C).Humidity
In September, the average relative humidity in Donnellson is 75%.Rainfall
In Donnellson, Illinois, during September, the rain falls for 11.4 days and regularly aggregates up to 1.57" (40mm) of precipitation. In Donnellson, during the entire year, the rain falls for 138.5 days and collects up to 24.33" (618mm) of precipitation.Snowfall
In Donnellson, snow does not fall in April through October.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:27 am and sunset at 7:27 pm. On the last day of September, in Donnellson, sunrise is at 6:53 am and sunset at 6:41 pm CDT.
Sunshine
The average sunshine in September in Donnellson is 9.3h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A daily high UV index of 5 in September leads to these guidelines:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Donnellson in September?
What is the average humidity in September in Donnellson?
How many days does it rain in September in Donnellson?
When it does not snow in Donnellson?
What is the average length of the day in September in Donnellson?
When is the sunrise / sunset in September in Donnellson?
How long on average sun shines in September in Donnellson?
What is the UV index intensity in September in Donnellson?
Average temperature in September
Donnellson, IL
- Average high temperature in September: 77.7°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (35.4°F).
- Average low temperature in September: 59.2°F
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure in September
Donnellson, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Donnellson, IL
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in September
Donnellson, IL
- Average humidity in September: 75%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Donnellson, IL
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is June (3.35").
The driest month (with the least rainfall) is February (1.34").
Average rainfall days in September
Donnellson, IL
- Average rainfall days in September: 11.4 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (7 days).
Average snowfall in September
Donnellson, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.81").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Donnellson, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.2 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
Donnellson, IL
- Average daylight in September: 12h and 2min
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 30min).
- Average sunshine in September: 9h and 2min
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 18min).
Average sunshine days in September
Donnellson, IL
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in September
Donnellson, 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
Donnellson, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June and September (Cloud cover 29).
Average visibility in September
Donnellson, 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).
Donnellson, Illinois, USA
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