Chicago weather in August
August is one of the best months to visit Chicago: highs of 25°C (77°F) and about 105 mm (4.1 in) of rain on average. Nights average 20°C (68°F) and cloud cover 48% (NASA POWER, 2001–2025 averages). It is the 2nd wettest month of the year and the 2nd warmest. Compared with July, it is about as warm and about as wet; September brings highs of 22°C (71°F) and 86 mm (3.4 in) of rain.
Is August a good time to visit Chicago?
best month Weather score 73/100.
Yes. August is one of the best months for weather in Chicago.
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Does it rain a lot in Chicago in August?
Some rain is normal: about 105 mm (4.1 in) falls in an average August. It is the 2nd wettest month of the year.
How warm is Chicago in August?
Days average 25°C (77°F) and nights 20°C (68°F).
Chicago weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 0°C (32°F) | -5°C (23°F) | 48 mm | 71% | least pleasant |
| February | 0°C (33°F) | -5°C (23°F) | 54 mm | 70% | least pleasant |
| March | 5°C (41°F) | -1°C (31°F) | 62 mm | 66% | least pleasant |
| April | 10°C (50°F) | 4°C (39°F) | 95 mm | 63% | least pleasant |
| May | 15°C (59°F) | 9°C (47°F) | 117 mm | 64% | fair |
| June | 21°C (70°F) | 15°C (59°F) | 102 mm | 56% | best |
| July | 25°C (77°F) | 20°C (68°F) | 95 mm | 48% | best |
| August | 25°C (77°F) | 20°C (68°F) | 105 mm | 48% | best |
| September | 22°C (71°F) | 16°C (62°F) | 86 mm | 46% | best |
| October | 15°C (59°F) | 10°C (49°F) | 99 mm | 58% | fair |
| November | 9°C (47°F) | 4°C (38°F) | 61 mm | 63% | least pleasant |
| December | 3°C (37°F) | -2°C (29°F) | 58 mm | 73% | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months
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