Annual mean 11°C · wettest around October · prevailing wind SW
Warmest
26.0 °C
Coldest
-2.5 °C
Wettest
38%
Windiest
6.7 m/s
Prevailing
SW
5.7 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Chicago over the whole year is 11°C. July is the hottest month, with highs of about 26°C; January is the coldest, with lows of about -4°C. Chicago has no sharply defined rainy season: the chance of rain on a given day runs from 29% in February, the driest month, to 34% in October, the wettest. Winds in Chicago are highest in March, averaging 6.0 m/s (22 km/h), and lightest in July, at 4.1 m/s (15 km/h). The prevailing wind is from the SW. The clearest skies in Chicago come in August, when the sky is typically 45% covered; January is the cloudiest month, at 69%.
Month by month Chicago climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
-2°C
-4°C
-9°C
29%
69%
5.9 m/s
0
0
1
February
1°C
-3°C
-6°C
29%
59%
5.9 m/s
1
0
6
March
6°C
2°C
-1°C
33%
60%
6.0 m/s
2
0
14
April
11°C
7°C
5°C
33%
60%
5.8 m/s
14
0
34
May
17°C
13°C
13°C
34%
57%
5.0 m/s
40
9
55
June
24°C
19°C
22°C
31%
47%
4.7 m/s
58
30
47
July
26°C
22°C
26°C
32%
46%
4.1 m/s
56
49
27
August
26°C
21°C
25°C
32%
45%
4.2 m/s
61
45
31
September
23°C
17°C
21°C
31%
47%
4.6 m/s
66
24
56
October
15°C
11°C
11°C
34%
54%
5.4 m/s
30
3
56
November
7°C
4°C
1°C
31%
58%
5.8 m/s
4
0
21
December
2°C
-1°C
-4°C
32%
65%
5.7 m/s
0
0
5
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Chicago weather by season
Year round, Chicago has days of about -2°C at their warmest in January, its coolest month, and 26°C in July, its warmest; the coolest hours of the day run from -4°C to 22°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around October and least likely around February. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Chicago weather in winterDecember to February
High 0°CLow -2°CRain 30%
Winter in Chicago has typical daily highs of about 0°C and lows of about -2°C, with a 30% chance of rain on a given day.
Chicago weather in springMarch to May
High 11°CLow 7°CRain 33%
Spring in Chicago has typical daily highs of about 11°C and lows of about 7°C, with a 33% chance of rain on a given day.
Chicago weather in summerJune to August
High 25°CLow 21°CRain 32%
Summer in Chicago has typical daily highs of about 25°C and lows of about 21°C, with a 32% chance of rain on a given day.
Chicago weather in autumnSeptember to November
High 15°CLow 11°CRain 32%
Autumn in Chicago has typical daily highs of about 15°C and lows of about 11°C, with a 32% chance of rain on a given day.
When is the rainy season in Chicago?
Chicago has no sharply defined rainy season: the chance of rain on a given day runs from 29% in February, the driest month, to 34% in October, the wettest.
What time of year is Chicago windiest?
Winds in Chicago are highest in March, averaging 6.0 m/s (22 km/h), and lightest in July, at 4.1 m/s (15 km/h). The prevailing wind is from the SW.
What is the average temperature in Chicago year round?
The average temperature in Chicago over the whole year is 11°C. July is the hottest month, with highs of about 26°C; January is the coldest, with lows of about -4°C.