Chillicothe, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Chillicothe, a city in Peoria County, Illinois.
Tonight
68°F
Mostly Cloudy then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 4am and 5am, then patchy fog and a chance of showers and thunderstorms. Mostly cloudy, with a low around 68. East southeast wind around 8 mph, with gusts as high as 17 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Chillicothe
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 68°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 8 mph ESE | 25% |
| Saturday | 84°F | Patchy Fog then Chance Showers And Thunderstorms | 7 mph SSE | 33% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 3 to 7 mph NNE | 67% |
| Sunday | 75°F | Rain Showers | 3 to 13 mph NNE | 75% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 10 to 14 mph NE | 69% |
| Monday | 66°F | Showers And Thunderstorms Likely | 14 mph ENE | 69% |
| Monday Night | 54°F | Chance Rain Showers | 10 to 15 mph NE | 43% |
| Tuesday | 65°F | Chance Rain Showers | 13 mph NE | 29% |
| Tuesday Night | 51°F | Mostly Cloudy | 5 to 13 mph NNE | 5% |
| Wednesday | 69°F | Mostly Sunny | 8 mph NNE | 4% |
| Wednesday Night | 53°F | Partly Cloudy | 2 to 7 mph NNE | 4% |
| Thursday | 70°F | Mostly Sunny | 2 to 6 mph NNE | 3% |
| Thursday Night | 55°F | Partly Cloudy | 1 to 5 mph NNE | 4% |
| Friday | 72°F | Mostly Sunny | 2 to 6 mph NNE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Chillicothe (40.916, -89.503). Updated through the day.
Growing snapshot for Chillicothe
Last spring frost
Apr 20
First fall frost
Oct 17
Growing season
178 days
Hardiness zone
6a
More local growing data for Chillicothe: nearby ZIP 61562 weather · frost dates · planting calendar · Illinois frost dates
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West Peoria
Climate data from the nearest NOAA station, Lacon, Il (10.5 mi from Chillicothe). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.