Chicago Climate by Month
Chicago, Illinois, United States
Warm summers and freezing winters, with rain spread through the year.
Warm summers and freezing winters, with rain spread through the year: that's Chicago's climate in short. Expect highs of 84°F (29°C) in July and 33°F (0°C) in January, with the coldest nights (January) near 18°F (-8°C). It gets 39 in (991 mm) of rain a year, spread across the months.
- Warmest month
- 84°F(29°C)
- Average high, July
- Coldest nights
- 18°F(-8°C)
- Average low, January
- Rain per year
- 39 in(991 mm)
- No clear rainy season
- Humidity
- 71%
- Sunniest: July
Best and worst months in Chicago
Best for weatherThe most comfortable weather comes in September, with highs around 76°F (25°C) and about 3.2 in (81 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 33°F (0°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Chicago weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 33°F(0°C) | 18°F(-8°C) | 2.1 in(53 mm) | 86% | 1.4 |
| FebFebruary | 37°F(3°C) | 21°F(-6°C) | 1.9 in(47 mm) | 73% | 2.4 |
| MarMarch | 47°F(8°C) | 31°F(-1°C) | 2.4 in(61 mm) | 75% | 3.5 |
| AprApril | 60°F(15°C) | 39°F(4°C) | 4.5 in(115 mm) | 66% | 4.4 |
| MayMay | 71°F(22°C) | 49°F(9°C) | 4.5 in(114 mm) | 69% | 5.1 |
| JunJune | 80°F(27°C) | 59°F(15°C) | 4.4 in(112 mm) | 69% | 5.7 |
| JulJuly | 84°F(29°C) | 64°F(18°C) | 3.6 in(92 mm) | 70% | 5.8 |
| AugAugust | 82°F(28°C) | 63°F(17°C) | 4.2 in(106 mm) | 73% | 5.1 |
| SepSeptemberBest | 76°F(25°C) | 56°F(13°C) | 3.2 in(81 mm) | 69% | 4.3 |
| OctOctober | 64°F(18°C) | 44°F(7°C) | 3.1 in(79 mm) | 63% | 2.8 |
| NovNovember | 49°F(9°C) | 33°F(1°C) | 2.9 in(73 mm) | 69% | 1.6 |
| DecDecember | 37°F(3°C) | 23°F(-5°C) | 2.3 in(58 mm) | 71% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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