Bloomington, Illinois Climate by Month
Bloomington, Illinois, United States
Warm summers and freezing winters, with rain spread through the year.
Bloomington has warm summers and freezing winters, with rain spread through the year. Afternoon highs range from 34°F (1°C) in January to 86°F (30°C) in July, and January nights average 18°F (-8°C). About 38 in (973 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 86°F(30°C)
- Average high, July
- Coldest nights
- 18°F(-8°C)
- Average low, January
- Rain per year
- 38 in(973 mm)
- No clear rainy season
- Humidity
- 71%
- Sunniest: July
Best and worst months in Bloomington
Best for weatherThe most comfortable weather comes in May and September, with highs around 77°F (25°C) and about 4.1 in (105 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 34°F (1°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 May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Bloomington weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 34°F(1°C) | 18°F(-8°C) | 1.9 in(47 mm) | 84% | 1.5 |
| FebFebruary | 39°F(4°C) | 21°F(-6°C) | 1.6 in(41 mm) | 71% | 2.6 |
| MarMarch | 51°F(11°C) | 31°F(0°C) | 2.8 in(72 mm) | 69% | 3.7 |
| AprApril | 63°F(17°C) | 41°F(5°C) | 4.1 in(104 mm) | 60% | 4.5 |
| MayMayBest | 74°F(24°C) | 52°F(11°C) | 4.6 in(117 mm) | 66% | 5.2 |
| JunJune | 83°F(28°C) | 61°F(16°C) | 4.3 in(108 mm) | 67% | 5.9 |
| JulJuly | 86°F(30°C) | 65°F(18°C) | 4.3 in(109 mm) | 70% | 6.0 |
| AugAugust | 85°F(29°C) | 63°F(17°C) | 3.2 in(81 mm) | 70% | 5.3 |
| SepSeptemberBest | 79°F(26°C) | 55°F(13°C) | 3.6 in(92 mm) | 67% | 4.5 |
| OctOctober | 66°F(19°C) | 44°F(7°C) | 2.8 in(72 mm) | 68% | 3.0 |
| NovNovember | 51°F(10°C) | 32°F(0°C) | 2.6 in(65 mm) | 79% | 1.9 |
| DecDecember | 39°F(4°C) | 23°F(-5°C) | 2.6 in(65 mm) | 85% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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