North America › United States › Chicago
30-year normals (1991-2020)
Chicago has a humid continental climate, classified as Dfb in the Köppen system. The warmest month is July with an average high of 27°C, while the coldest month is January with lows dropping to -7°C. The annual temperature range of 34°C is typical of continental climates with distinct seasons.
The driest month is February with only 7 rain days and 52mm of precipitation. For travellers, February through to the following month typically offers the best balance of warm temperatures and dry conditions. Average humidity ranges from 65% to 65% throughout the year.
Based on temperature and rainfall data, the best months to visit Chicago are September, October, May. These months offer the most comfortable temperatures with relatively low rainfall, ideal for sightseeing and outdoor activities.
Full Best Time to Visit GuideWarmest Month
27°C
July
Coldest Month
-7°C
January
Driest Month
7 days
February
Annual Range
34°C
-7° to 27°
| Month | High | Low | Rain Days | Sun | Details |
|---|---|---|---|---|---|
| January | -1°C | -7°C | 9 | 6h | View |
| February | 1°C | -6°C | 7 | 7h | View |
| March | 5°C | -2°C | 10 | 8h | View |
| April | 11°C | 4°C | 12 | 9h | View |
| May | 18°C | 11°C | 13 | 11h | View |
| June | 24°C | 18°C | 12 | 12h | View |
| July | 27°C | 21°C | 11 | 12h | View |
| August | 26°C | 20°C | 11 | 12h | View |
| September | 22°C | 16°C | 9 | 10h | View |
| October | 16°C | 10°C | 9 | 8h | View |
| November | 8°C | 3°C | 9 | 6h | View |
| December | 2°C | -3°C | 9 | 5h | View |
January
9 rain days, 6h sun
February
7 rain days, 7h sun
March
10 rain days, 8h sun
April
12 rain days, 9h sun
May
13 rain days, 11h sun
June
12 rain days, 12h sun
July
11 rain days, 12h sun
August
11 rain days, 12h sun
September
9 rain days, 10h sun
October
9 rain days, 8h sun
November
9 rain days, 6h sun
December
9 rain days, 5h sun
Chicago in July
Data Sources for Chicago
Climate normals represent 30-year averages (1991-2020). Individual years may vary.