Chicago weather by month

Check out Chicago weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature in Chicago (°F)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
30°F maximum daytime temperature in January in Chicago30
34°F maximum daytime temperature in February in Chicago34
46°F maximum daytime temperature in March in Chicago46
59°F maximum daytime temperature in April in Chicago59
70°F maximum daytime temperature in May in Chicago70
81°F maximum daytime temperature in June in Chicago81
84°F maximum daytime temperature in July in Chicago84
82°F maximum daytime temperature in August in Chicago82
75°F maximum daytime temperature in September in Chicago75
63°F maximum daytime temperature in October in Chicago63
48°F maximum daytime temperature in November in Chicago48
36°F maximum daytime temperature in December in Chicago36
Min temperature (night-time)
14°F minimum night-time temperature in January in Chicago14
18°F minimum night-time temperature in February in Chicago18
28°F minimum night-time temperature in March in Chicago28
37°F minimum night-time temperature in April in Chicago37
48°F minimum night-time temperature in May in Chicago48
57°F minimum night-time temperature in June in Chicago57
63°F minimum night-time temperature in July in Chicago63
61°F minimum night-time temperature in August in Chicago61
54°F minimum night-time temperature in September in Chicago54
43°F minimum night-time temperature in October in Chicago43
32°F minimum night-time temperature in November in Chicago32
19°F minimum night-time temperature in December in Chicago19
Heat & Humidity
No heat & humidity in January in Chicago0
No heat & humidity in February in Chicago0
No heat & humidity in March in Chicago0
No heat & humidity in April in Chicago0
No heat & humidity in May in Chicago0
Low heat & humidity in June in ChicagoL
Moderate heat & humidity in July in ChicagoM
Moderate heat & humidity in August in ChicagoM
No heat & humidity in September in Chicago0
No heat & humidity in October in Chicago0
No heat & humidity in November in Chicago0
No heat & humidity in December in Chicago0
Sea temperature
39°F sea temperature in January in Chicago39
37°F sea temperature in February in Chicago37
37°F sea temperature in March in Chicago37
37°F sea temperature in April in Chicago37
43°F sea temperature in May in Chicago43
54°F sea temperature in June in Chicago54
66°F sea temperature in July in Chicago66
70°F sea temperature in August in Chicago70
66°F sea temperature in September in Chicago66
57°F sea temperature in October in Chicago57
48°F sea temperature in November in Chicago48
41°F sea temperature in December in Chicago41

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & Daylight in Chicago

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
10 hours of daylight per day in January in Chicago10
11 hours of daylight per day in February in Chicago11
12 hours of daylight per day in March in Chicago12
13 hours of daylight per day in April in Chicago13
15 hours of daylight per day in May in Chicago15
15 hours of daylight per day in June in Chicago15
15 hours of daylight per day in July in Chicago15
14 hours of daylight per day in August in Chicago14
12 hours of daylight per day in September in Chicago12
11 hours of daylight per day in October in Chicago11
10 hours of daylight per day in November in Chicago10
9 hours of daylight per day in December in Chicago9
UV Index (Maximum)
UV (maximum) index 1 (Low) in January in Chicago1
UV (maximum) index 2 (Low) in February in Chicago2
UV (maximum) index 4 (Moderate) in March in Chicago4
UV (maximum) index 6 (High) in April in Chicago6
UV (maximum) index 7 (High) in May in Chicago7
UV (maximum) index 9 (Very High) in June in Chicago9
UV (maximum) index 9 (Very High) in July in Chicago9
UV (maximum) index 8 (Very High) in August in Chicago8
UV (maximum) index 6 (High) in September in Chicago6
UV (maximum) index 4 (Moderate) in October in Chicago4
UV (maximum) index 2 (Low) in November in Chicago2
UV (maximum) index 1 (Low) in December in Chicago1

Rainfall in Chicago

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
12 days with some rainfall in January in Chicago12
10 days with some rainfall in February in Chicago10
13 days with some rainfall in March in Chicago13
13 days with some rainfall in April in Chicago13
11 days with some rainfall in May in Chicago11
10 days with some rainfall in June in Chicago10
10 days with some rainfall in July in Chicago10
9 days with some rainfall in August in Chicago9
9 days with some rainfall in September in Chicago9
9 days with some rainfall in October in Chicago9
11 days with some rainfall in November in Chicago11
12 days with some rainfall in December in Chicago12
Average monthly rainfall (inches)
1.7 inches monthly rainfall in January in Chicago1.7
1.5 inches monthly rainfall in February in Chicago1.5
2.6 inches monthly rainfall in March in Chicago2.6
3.8 inches monthly rainfall in April in Chicago3.8
3.3 inches monthly rainfall in May in Chicago3.3
3.8 inches monthly rainfall in June in Chicago3.8
3.9 inches monthly rainfall in July in Chicago3.9
3.8 inches monthly rainfall in August in Chicago3.8
3.4 inches monthly rainfall in September in Chicago3.4
2.7 inches monthly rainfall in October in Chicago2.7
2.8 inches monthly rainfall in November in Chicago2.8
2.4 inches monthly rainfall in December in Chicago2.4

More about Chicago

Chicago by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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The climate guide for Illinois (Chicago) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

What's the climate like in Chicago?

Chicago has a cold climate with hot summers and some rainfall in all months.

Metric (°C)  |  Imperial (°F)

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Tropical storm risk: Chicago, Illinois hurricane season

% of month affected by tropical storms
0
0
0
0
0
0
0
0
0
0
0
0
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

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More about the USA

Compare Chicago with the USA

Below the Chicago chart shows average maximum daytime temperature for Chicago, Illinois, USA and the USA (Washington).

Maximum daytime temperature (°F)

Chicago, Illinois, USA
USA (Washington)
41
34
45
46
55
59
66
70
75
81
84
84
88
82
86
75
79
63
68
48
57
36
46
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
30

Metric (°C)  |  Imperial (°F)

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