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
With the onset of September, the average high-temperature subtly recedes from August's warm 79.3°F (26.3°C) to a pleasant 72.1°F (22.3°C). Throughout the month of September, the average temperature in River Forest dips to a moderate 60.4°F (15.8°C) at night.Humidity
In River Forest, the average relative humidity in September is 74%.Rainfall
In River Forest, in September, during 14.5 rainfall days, 2.72" (69mm) of precipitation is typically accumulated. Throughout the year, there are 157.8 rainfall days, and 33.7" (856mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in River Forest.Daylight
In River Forest, the average length of the day in September is 12h and 28min.On the first day of September in River Forest, Illinois, sunrise is at 6:17 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:34 pm CDT.
Sunshine
In River Forest, Illinois, the average sunshine in September is 9h.UV index
In River Forest, Illinois, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 4 during September translates into the following guidance:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Frequently asked questions
What are the temperatures in River Forest in September?
What is the average humidity in September in River Forest?
How much does it rain in River Forest in September?
When it does not snow in River Forest?
Does it snow in River Forest in September?
What is the average length of the day in September in River Forest?
When is the sunrise / sunset in September in River Forest?
How many hours of sunshine does River Forest have in September?
What is the UV index reading in September in River Forest?
Average temperature in September
River Forest, IL
- Average high temperature in September: 72.1°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (28.9°F).
- Average low temperature in September: 60.4°F
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (19.4°F).
Average pressure in September
River Forest, 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
River Forest, IL
- Average wind speed in September: 8.3mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in September
River Forest, IL
- Average humidity in September: 74%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
River Forest, IL
- Average rainfall in September: 2.72"
The wettest month (with the highest rainfall) is May (4.49").
The driest month (with the least rainfall) is December (1.57").
Average rainfall days in September
River Forest, IL
- Average rainfall days in September: 14.5 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in September
River Forest, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.69").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
River Forest, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
River Forest, 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: 9h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
River Forest, IL
- Average sunshine days in September: 13.4 days
The month with the most sunshine days is December (16.7 days).
The month with the least sunshine days is July (9.9 days).
Average UV index in September
River Forest, IL
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
River Forest, IL
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
River Forest, 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).
River Forest, Illinois, USA
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