Des Plaines Climate by Month
Des Plaines, Illinois, United States
Warm summers and freezing winters, with rain spread through the year.
Des Plaines has warm summers and freezing winters, with rain spread through the year. Afternoon highs range from 33°F (0°C) in January to 85°F (29°C) in July, and January nights average 17°F (-8°C). About 37 in (949 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 85°F(29°C)
- Average high, July
- Coldest nights
- 17°F(-8°C)
- Average low, January
- Rain per year
- 37 in(949 mm)
- No clear rainy season
- Humidity
- 71%
- Sunniest: July
Best and worst months in Des Plaines
Best for weatherThe most comfortable weather comes in September, with highs around 76°F (25°C) and about 3.3 in (83 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)
Des Plaines weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 33°F(0°C) | 17°F(-8°C) | 2.0 in(50 mm) | 88% | 1.4 |
| FebFebruary | 37°F(3°C) | 20°F(-7°C) | 1.8 in(45 mm) | 76% | 2.4 |
| MarMarch | 47°F(9°C) | 30°F(-1°C) | 2.3 in(58 mm) | 75% | 3.6 |
| AprApril | 60°F(15°C) | 39°F(4°C) | 4.2 in(107 mm) | 59% | 4.5 |
| MayMay | 71°F(22°C) | 49°F(9°C) | 4.3 in(110 mm) | 68% | 5.1 |
| JunJune | 81°F(27°C) | 59°F(15°C) | 4.3 in(108 mm) | 69% | 5.8 |
| JulJuly | 85°F(29°C) | 64°F(18°C) | 3.4 in(87 mm) | 69% | 5.9 |
| AugAugust | 83°F(28°C) | 63°F(17°C) | 4.3 in(109 mm) | 73% | 5.1 |
| SepSeptemberBest | 76°F(25°C) | 55°F(13°C) | 3.3 in(83 mm) | 70% | 4.3 |
| OctOctober | 64°F(18°C) | 43°F(6°C) | 2.9 in(73 mm) | 65% | 2.7 |
| NovNovember | 49°F(9°C) | 32°F(0°C) | 2.6 in(65 mm) | 71% | 1.7 |
| DecDecember | 37°F(3°C) | 22°F(-6°C) | 2.1 in(54 mm) | 73% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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