Summer temperatures · Illinois
How hot does Peoria get in summer?
In a typical summer, June to August, Peoria averages highs around 85°F and lows around 64°F.
About 23 days a year reach 90°F or hotter, and a day at 100°F comes along less than once a year. About 101 days a year get to 80°F or warmer. That makes it the 60th hottest summer of the 129 US cities we track.
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The hottest high in the forecast for the next 48 hours is about 48°F.
Peoria’s summer highs average about 85°F, warm enough that the Illinois River becomes the most popular place in town in July.
Live 48-hour forecast from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Summer at a glance
| Average summer high | 85°F |
|---|---|
| Average summer low | 64°F |
| Days a year at 80°F or warmer | 101 |
| Days a year at 90°F or hotter | 23 |
| Days a year at 100°F or hotter | fewer than one |
| Average winter high, for comparison | 37°F |
Summer here is June to August. Counts are averages a year.
Cities with about the same summer
- Sacramento, California: highs around 91°F, lows around 58°F
- Cincinnati, Ohio: highs around 85°F, lows around 64°F
- Dayton, Ohio: highs around 84°F, lows around 64°F
More about the weather here
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00014842.