September weather forecastNorth Riverside, IL
September
Weather in September
The first month of the autumn, September, is also an agreeable month in North Riverside, Illinois, with an average temperature ranging between min 59.5°F (15.3°C) and max 72.9°F (22.7°C).Temperature
In September, the average high-temperature marginally drops from a moderately hot 79.3°F (26.3°C) in August to a pleasant 72.9°F (22.7°C). During September, the temperature is averaged to a low of 59.5°F (15.3°C) at night.Humidity
In September, the average relative humidity in North Riverside, Illinois, is 74%.Rainfall
In North Riverside, in September, it is raining for 7.5 days, with typically 0.51" (13mm) of accumulated precipitation. Throughout the year, in North Riverside, there are 92 rainfall days, and 7.4" (188mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:47 am and sunset at 6:34 pm CDT.
Sunshine
In North Riverside, the average sunshine in September is 9.1h.UV index
In September, the average daily maximum UV index in North Riverside, Illinois, is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index, 4 during September, leads to the following recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
North Riverside, IL
- Average high temperature in September: 72.9°F
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (29.1°F).
- Average low temperature in September: 59.5°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 (19.2°F).
Average pressure in September
North Riverside, 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
North Riverside, IL
- Average wind speed in September: 8.1mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in September
North Riverside, IL
- Average humidity in September: 74%
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
North Riverside, IL
- Average rainfall in September: 0.51"
The wettest month (with the highest rainfall) is May (1.1").
The driest months (with the least rainfall) are February, March, November and December (0.39").
Average rainfall days in September
North Riverside, IL
- Average rainfall days in September: 7.5 days
The month with the highest number of rainy days is June (11.7 days).
The month with the least rainy days is January (3.1 days).
Average snowfall in September
North Riverside, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
North Riverside, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (7.3 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
North Riverside, IL
- Average daylight in September: 12h and 30min
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 6min
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 48min).
Average sunshine days in September
North Riverside, IL
- Average sunshine days in September: 19.9 days
The month with the most sunshine days is December (23.7 days).
The month with the least sunshine days is June (14.3 days).
Average UV index in September
North Riverside, 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
North Riverside, 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
North Riverside, 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).
