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
September's onset brings a negligible change in high-temperatures, falling from a warm 80.6°F (27°C) in August to a still moderately hot 74.1°F (23.4°C). The nighttime temperature in Willow Springs dips to a moderate 58.6°F (14.8°C) on average during September.Humidity
In September, the average relative humidity in Willow Springs is 75%.Rainfall
In Willow Springs, in September, during 15 rainfall days, 2.68" (68mm) of precipitation is typically accumulated. Throughout the year, there are 166.8 rainfall days, and 34.96" (888mm) of precipitation is accumulated.Snowfall
In Willow Springs, snow does not fall in May through September.Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:24 pm. On the last day of September, in Willow Springs, sunrise is at 6:48 am and sunset at 6:34 pm CDT.
Sunshine
The average sunshine in September is 8.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: The average daily UV index of 4 in September transforms into the following instructions:
Exercise prevention - Protecting skin and eyes from harm is required. Avoiding the Sun during its peak radiation time around midday is a healthy practice. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Willow Springs?
What is the average humidity in September in Willow Springs?
How many days does it rain in September in Willow Springs?
When it does not snow in Willow Springs?
Does it snow in Willow Springs in September?
How many hours of daylight does Willow Springs have in September?
When are sunrise and sunset in September in Willow Springs?
How many hours of sunshine does Willow Springs have in September?
What is the UV index reading in September in Willow Springs?
Average temperature in September
Willow Springs, IL
- Average high temperature in September: 74.1°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (28.9°F).
- Average low temperature in September: 58.6°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in September
Willow Springs, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Willow Springs, IL
- Average wind speed in September: 7.4mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in September
Willow Springs, IL
- Average humidity in September: 75%
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Willow Springs, IL
- Average rainfall in September: 2.68"
The wettest month (with the highest rainfall) is May (4.61").
The driest months (with the least rainfall) are November and December (1.77").
Average rainfall days in September
Willow Springs, IL
- Average rainfall days in September: 15 days
The month with the highest number of rainy days is June (19.4 days).
The month with the least rainy days is February (5.9 days).
Average snowfall in September
Willow Springs, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Willow Springs, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.3 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
Willow Springs, IL
- Average daylight in September: 12h and 3min
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 5min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Willow Springs, IL
- Average sunshine days in September: 11.9 days
The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is June (8.2 days).
Average UV index in September
Willow Springs, IL
- Average UV index in September: 4
The months with the highest UV index are July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Willow Springs, IL
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Willow Springs, IL
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Willow Springs, Illinois, USA
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