United States of America
Chicago sees feels-like daytime highs peak around 33.5°C in July and nighttime lows bottom out near -6.1°C in January. May is the wettest month (~91 mm), while January is the driest (~27 mm). For sunshine, August leads with about 67% clear skies.
Based on mild feels-like temperatures and low rain chances, the most comfortable months are September, May, and June — expect around 18.9–26°C with roughly 29% chance of rain on a given day in September.
| Month | Low / High °C | Rain % | Rainfall | Clear skies | Wind |
|---|---|---|---|---|---|
| January | -6.1° / -1.1° | 10% | 27 mm | 41% | 22.8 kph |
| February | -4.9° / 0.2° | 10% | 27 mm | 44% | 21.9 kph |
| March | 0.5° / 6.5° | 20% | 47 mm | 47% | 21.1 kph |
| April | 7.4° / 13.9° | 29% | 73 mm | 48% | 19.9 kph |
| May☀ | 14° / 20.9° | 35% | 91 mm | 50% | 17.6 kph |
| June☀ | 21.5° / 29.1° | 36% | 89 mm | 57% | 15.2 kph |
| July | 25.8° / 33.5° | 36% | 87 mm | 65% | 14.1 kph |
| August | 25° / 31.9° | 34% | 91 mm | 67% | 14.3 kph |
| September☀ | 18.9° / 26° | 29% | 78 mm | 66% | 16.8 kph |
| October | 11.2° / 17.9° | 26% | 72 mm | 59% | 19.8 kph |
| November | 3° / 9.1° | 23% | 62 mm | 49% | 21.8 kph |
| December | -3.7° / 1.4° | 16% | 43 mm | 43% | 22.4 kph |
Feels-like temperatures from long-term historical data; ☀ marks the most comfortable months (mild temperatures, low rain).
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