Historical weather data, all-time temperature records, and monthly climate averages for East Peoria, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in East Peoria sits in that classic Midwest in-between zone — the average high of 57° feels like spring, but a 7% chance of snow keeps things honest. The date's range tells the real story: it's touched 83° (1988) and dropped to 20° (1982), a 63-degree spread across 82 years of records. There's a 38% chance you'll see some precipitation today, so don't leave the umbrella behind.
East Peoria plays the full Midwest hand — from a scorching 105° on June 25, 1988, to a brutal -25° on January 17, 1977, a swing of 130 degrees across its recorded history. The wettest single day on record dropped 5.19 inches on July 15, 2020, while the snowiest dumped 12.2 inches on January 13, 1979. This is a city that has seen genuine weather extremes on both ends of the thermometer.
Summers are the main event in East Peoria, with the warmest week of the year (July 9–15) averaging a high of 86° and a full summer season that runs comfortably warm from June through August. Winters are cold and real — the coolest week averages just 31° — so January and February are for the hardy. If you're watching for rain, late April is the wettest stretch of the year, averaging over an inch of precipitation in a single week.