Peoria, Illinois Climate by Month
Peoria, Illinois, United States
Hot summers and freezing winters, with rain spread through the year.
Peoria has hot summers and freezing winters, with rain spread through the year. July is the warmest month, with highs around 87°F (30°C); January is the coolest at 34°F (1°C), and nights dip to 17°F (-8°C). It gets 37 in (942 mm) of rain a year, spread across the months.
- Warmest month
- 87°F(30°C)
- Average high, July
- Coldest nights
- 17°F(-8°C)
- Average low, January
- Rain per year
- 37 in(942 mm)
- No clear rainy season
- Humidity
- 70%
- Sunniest: July
Best and worst months in Peoria
Best for weatherThe most comfortable weather comes in May and September, with highs around 77°F (25°C) and about 3.8 in (97 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)
Peoria weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 34°F(1°C) | 17°F(-8°C) | 1.7 in(44 mm) | 85% | 1.5 |
| FebFebruary | 39°F(4°C) | 21°F(-6°C) | 1.7 in(42 mm) | 70% | 2.6 |
| MarMarch | 52°F(11°C) | 32°F(0°C) | 2.7 in(68 mm) | 67% | 3.8 |
| AprApril | 64°F(18°C) | 42°F(5°C) | 4.1 in(105 mm) | 59% | 4.5 |
| MayMayBest | 75°F(24°C) | 52°F(11°C) | 4.3 in(110 mm) | 65% | 5.3 |
| JunJune | 83°F(29°C) | 62°F(17°C) | 4.7 in(119 mm) | 66% | 5.9 |
| JulJuly | 87°F(30°C) | 66°F(19°C) | 4.1 in(105 mm) | 71% | 6.0 |
| AugAugust | 86°F(30°C) | 64°F(18°C) | 2.9 in(73 mm) | 71% | 5.4 |
| SepSeptemberBest | 79°F(26°C) | 55°F(13°C) | 3.3 in(84 mm) | 66% | 4.6 |
| OctOctober | 66°F(19°C) | 44°F(7°C) | 2.8 in(72 mm) | 67% | 3.0 |
| NovNovember | 51°F(11°C) | 33°F(0°C) | 2.5 in(64 mm) | 66% | 1.9 |
| DecDecember | 39°F(4°C) | 23°F(-5°C) | 2.2 in(56 mm) | 86% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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