Chillicothe, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Chillicothe, a city in Peoria County, Illinois.
Today
59°F
Slight Chance Light Rain then Slight Chance Drizzle
A slight chance of rain before 8am, then a slight chance of drizzle. Cloudy, with a high near 59. Southwest wind around 13 mph, with gusts as high as 25 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Chillicothe
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 59°F | Slight Chance Light Rain then Slight Chance Drizzle | 13 mph SW | 19% |
| Tonight | 45°F | Slight Chance Drizzle then Cloudy | 12 mph SW | 10% |
| Thursday | 55°F | Cloudy then Chance Light Rain | 9 to 13 mph W | 28% |
| Thursday Night | 42°F | Chance Light Rain then Mostly Cloudy | 5 to 8 mph NW | 28% |
| Friday | 51°F | Partly Sunny | 9 mph N | 3% |
| Friday Night | 33°F | Partly Cloudy | 0 to 6 mph NNW | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 33°F | Mostly Clear | 2 mph W | 2% |
| Sunday | 57°F | Sunny | 2 to 7 mph W | 2% |
| Sunday Night | 35°F | Clear | 0 to 3 mph W | 1% |
| Monday | 62°F | Sunny | 0 to 7 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 1 to 5 mph WSW | 0% |
| Tuesday | 63°F | Sunny | 3 mph WNW | 1% |
| Tuesday Night | 40°F | Mostly Clear | 1 mph NNW | 0% |
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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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 Nov 4, 2026.