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 sea temperature 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
In Chicago, the average high-temperature in September slightly decreases from a moderately hot 77.5°F in August to an agreeable 71.1°F. Throughout September, a steady low-temperature average of 61.2°F is noted.Humidity
In Chicago, the average relative humidity in September is 75%.Rainfall
In Chicago, in September, during 14.5 rainfall days, 3.23" of precipitation is typically accumulated. Throughout the year, in Chicago, Illinois, there are 160.2 rainfall days, and 36.97" of precipitation is accumulated.Snowfall
June through October are months without snowfall in Chicago.Ocean temperature
In Chicago, the average seawater temperature in September is 68.5°F.Note: The majority of people do not enjoy swimming in 68.5°F. The difficulty in controlling breathing escalates as the temperature descends from 69.8°F to 59°F.
Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:16 am and sunset at 7:24 pm. On the last day of September, in Chicago, sunrise is at 6:46 am and sunset at 6:34 pm CDT.
Sunshine
In September, the average sunshine in Chicago is 9.1h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Exercise caution. Those with pale skin may experience burns in less than half an hour. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
FAQ
What is the usual temperature for Chicago in September?
What is the average humidity in September in Chicago?
How much does it rain in Chicago in September?
When it does not snow in Chicago?
What is the ocean temperature in September in Chicago?
How many hours of daylight does Chicago have in September?
When is the sunrise / sunset in September in Chicago?
How many hours of sunshine does Chicago have in September?
What is the UV index intensity in September in Chicago?
Average temperature in September
Chicago, IL
- Average high temperature in September: 71.1°F
The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in September: 61.2°F
The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).
Average pressure in September
Chicago, 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
Chicago, IL
- Average wind speed in September: 9.3mph
The windiest month (with the highest average wind speed) is January (12.5mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).
Average humidity in September
Chicago, IL
- Average humidity in September: 75%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Chicago, IL
- Average rainfall in September: 3.23"
The wettest month (with the highest rainfall) is June (4.88").
The driest month (with the least rainfall) is December (1.65").
Average rainfall days in September
Chicago, IL
- Average rainfall days in September: 14.5 days
The month with the highest number of rainy days is July (18.5 days).
The month with the least rainy days is February (5.5 days).
Average snowfall in September
Chicago, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.54").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Chicago, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Chicago, IL
- Average sea temperature in September: 68.6°F
The best month for swimming (with the highest average sea temperature) is August (73.9°F).
The coldest month (with the lowest average sea temperature) is February (36.9°F).
Average daylight in September /
Average sunshine in September
Chicago, 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 1min
The months with the most sunshine are July and August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Chicago, IL
- Average sunshine days in September: 12.1 days
The month with the most sunshine days is December (15.5 days).
The month with the least sunshine days is July (9.3 days).
Average UV index in September
Chicago, IL
- Average UV index in September: 4
The months with the highest UV index are 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
Chicago, IL
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility in September
Chicago, 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).
Chicago, Illinois, USA
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