Mild
Average highs are around 24°C, so days are mild rather than hot.
September verdict
Chicago, Illinois, United States in September
Weather score56Good
Good for holiday weather
Average highs are around 24°C, so days are mild rather than hot. Sunshine averages 7.4h per day, enough for a balanced month. Rainfall averages 93mm, so some wet days are possible.
September weather
Monthly averages
Temp
24°C
Rain
93mm
Sun
7.4h
Sea
20°C
Weather score
56
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 93mm, so some wet days are possible.
Some sun
Sunshine averages 7.4h per day, enough for a balanced month.
Cool sea
Sea temperatures average 20°C, so the water can feel cool.
Map
Weather map
Compare Chicago, Illinois, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September24°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsMay to September
This stretch sets the upper range for average daytime heat.
Rain
September93mm average rain
September is wetter than Chicago's yearly average, so flexible plans matter more.
Driest monthsJanuary to February and October
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September7.4 hours average sun
September sits close to Chicago's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September20°C average sea
September sits in the warmer sea-temperature season, usually making swimming easier to enjoy.
Warmest seaJuly to September
Sea temperatures are usually near 21°C in this stretch, so swimming comfort is at its strongest.
Weather score
September56 weather score
September sits close to Chicago's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
Hotels in Chicago, Illinois, United States
Marriott
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