Chicago, Illinois - Detailed climate information and monthly weather forecast

Average temperature
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average sea temperature
Average daylight
Average sunshine
Average UV index

An aerial view of the city of Chicago in Illinois, on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street

The average high temperature in January:
-0.3°C
The average high temperature in February:
2.1°C
The average high temperature in March:
8.2°C
The average high temperature in April:
15.1°C
The average high temperature in May:
21.2°C
The average high temperature in June:
26.6°C

The average high temperature in July:
29°C
The average high temperature in August:
27.8°C
The average high temperature in September:
24.1°C
The average high temperature in October:
17.1°C
The average high temperature in November:
9.2°C
The average high temperature in December:
1.8°C

The warmest month (with the highest average high temperature) is July (29°C).
The month with the lowest average high temperature is January (-0.3°C).

The average low temperature in January:
-7.7°C
The average low temperature in February:
-5.7°C
The average low temperature in March:
-0.6°C
The average low temperature in April:
5.4°C
The average low temperature in May:
10.9°C
The average low temperature in June:
16.7°C

The average low temperature in July:
19.7°C
The average low temperature in August:
19°C
The average low temperature in September:
14.2°C
The average low temperature in October:
7.6°C
The average low temperature in November:
1.4°C
The average low temperature in December:
-5.2°C

The month with the highest average low temperature is July (19.7°C).
The coldest month (with the lowest average low temperature) is January (-7.7°C).

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The average humidity in July:
68.5%
The average humidity in August:
70.7%
The average humidity in September:
71.1%
The average humidity in October:
68.6%
The average humidity in November:
72.5%
The average humidity in December:
75.5%

The month with the highest relative humidity is December (75.5%).
The month with the lowest relative humidity is May (64.1%).

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The average rainfall in January:
52.3mm
The average rainfall in February:
49.3mm
The average rainfall in March:
69.1mm
The average rainfall in April:
92.5mm
The average rainfall in May:
104.9mm
The average rainfall in June:
103.1mm

The average rainfall in July:
101.9mm
The average rainfall in August:
101.3mm
The average rainfall in September:
84.1mm
The average rainfall in October:
82.3mm
The average rainfall in November:
86.9mm
The average rainfall in December:
65.3mm

The wettest month (with the highest rainfall) is May (104.9mm).
The driest month (with the lowest rainfall) is February (49.3mm).

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The average rainfall days in January:
10.7 days
The average rainfall days in February:
8.8 days
The average rainfall days in March:
11.2 days
The average rainfall days in April:
11.1 days
The average rainfall days in May:
11.4 days
The average rainfall days in June:
10.3 days

The average rainfall days in July:
9.9 days
The average rainfall days in August:
9 days
The average rainfall days in September:
8.2 days
The average rainfall days in October:
10.2 days
The average rainfall days in November:
11.2 days
The average rainfall days in December:
11.1 days

The month with the highest number of rainy days is May (11.4 days).
The month with the lowest number of rainy days is September (8.2 days).

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The average snowfall in January:
292.1mm
The average snowfall in February:
231.1mm
The average snowfall in March:
137.2mm
The average snowfall in April:
25.4mm
The average snowfall in May:
0mm
The average snowfall in June:
0mm

The month with the highest snowfall is January (292.1mm).
Months with the lowest snowfall are May, June, July, August and September (0mm).

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The average snowfall days in January:
8.1 days
The average snowfall days in February:
5.5 days
The average snowfall days in March:
3.8 days
The average snowfall days in April:
0.7 days
The average snowfall days in May:
0 days
The average snowfall days in June:
0 days

The average snowfall days in July:
0 days
The average snowfall days in August:
0 days
The average snowfall days in September:
0 days
The average snowfall days in October:
0.1 days
The average snowfall days in November:
1.8 days
The average snowfall days in December:
6.7 days

The month with the highest number of snowfall days is January (8.1 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

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The average sea temperature in January:
4°C
The average sea temperature in February:
3°C
The average sea temperature in March:
3°C
The average sea temperature in April:
3°C
The average sea temperature in May:
6°C
The average sea temperature in June:
12°C

The average sea temperature in July:
19°C
The average sea temperature in August:
21°C
The average sea temperature in September:
19°C
The average sea temperature in October:
14°C
The average sea temperature in November:
9°C
The average sea temperature in December:
5°C

The best month for swimming (with the highest average sea temperature) is August (21°C).
Coldest months (with the lowest average sea temperature) are February, March and April (3°C).

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