Belleville, Illinois Climate by Month
Belleville, Illinois, United States
Hot summers and cold winters, with rain spread through the year.
Belleville has hot summers and cold winters, with rain spread through the year. Expect highs of 89°F (32°C) in July and 40°F (4°C) in January, with the coldest nights (January) near 23°F (-5°C). About 41 in (1035 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 89°F(32°C)
- Average high, July
- Coldest nights
- 23°F(-5°C)
- Average low, January
- Rain per year
- 41 in(1035 mm)
- No clear rainy season
- Humidity
- 69%
- Sunniest: June
Best and worst months in Belleville
Best for weatherMay and October are the best time for weather in Belleville: highs near 74°F (23°C) and about 3.9 in (98 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 40°F (4°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 October.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Belleville weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 40°F(4°C) | 23°F(-5°C) | 2.4 in(60 mm) | 84% | 1.8 |
| FebFebruary | 46°F(8°C) | 26°F(-3°C) | 2.4 in(61 mm) | 70% | 2.7 |
| MarMarch | 56°F(14°C) | 35°F(2°C) | 3.4 in(86 mm) | 67% | 3.8 |
| AprApril | 68°F(20°C) | 45°F(7°C) | 4.0 in(101 mm) | 64% | 4.8 |
| MayMayBest | 78°F(26°C) | 56°F(14°C) | 4.9 in(124 mm) | 66% | 5.4 |
| JunJune | 86°F(30°C) | 65°F(18°C) | 4.1 in(103 mm) | 66% | 6.1 |
| JulJuly | 89°F(32°C) | 68°F(20°C) | 3.9 in(98 mm) | 69% | 6.1 |
| AugAugust | 88°F(31°C) | 67°F(19°C) | 3.3 in(84 mm) | 69% | 5.6 |
| SepSeptember | 82°F(28°C) | 58°F(15°C) | 3.8 in(97 mm) | 64% | 4.7 |
| OctOctoberBest | 70°F(21°C) | 47°F(8°C) | 2.8 in(72 mm) | 66% | 3.3 |
| NovNovember | 56°F(13°C) | 36°F(2°C) | 3.1 in(79 mm) | 66% | 2.1 |
| DecDecember | 44°F(7°C) | 27°F(-3°C) | 2.8 in(70 mm) | 71% | 1.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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