Chillicothe, IL Weather & Growing Conditions
Tonight
45°F
Slight Chance Drizzle then Cloudy
A slight chance of drizzle before 10pm. Cloudy, with a low around 45. Southwest wind around 13 mph, with gusts as high as 22 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 45°F | Slight Chance Drizzle then Cloudy | 13 mph SW | 10% |
| Thursday | 54°F | Mostly Cloudy then Chance Light Rain | 8 to 15 mph W | 33% |
| Thursday Night | 40°F | Slight Chance Light Rain then Mostly Cloudy | 10 mph NNW | 20% |
| Friday | 48°F | Mostly Sunny | 7 to 13 mph N | 2% |
| Friday Night | 31°F | Mostly Clear | 1 to 5 mph NNW | 0% |
| Saturday | 51°F | Sunny | 1 to 5 mph NW | 0% |
| Saturday Night | 32°F | Mostly Clear | 2 mph W | 0% |
| Sunday | 58°F | Sunny | 2 to 7 mph W | 0% |
| Sunday Night | 35°F | Mostly Clear | 3 mph W | 0% |
| Monday | 62°F | Sunny | 2 to 9 mph SW | 0% |
| Monday Night | 40°F | Clear | 3 to 7 mph WSW | 0% |
| Tuesday | 62°F | Sunny | 5 mph WNW | 2% |
| Tuesday Night | 40°F | Mostly Clear | 2 mph NNW | 1% |
| Veterans Day | 61°F | Mostly Sunny | 1 to 5 mph N | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Chillicothe, IL
Last spring frost
Apr 22
First fall frost
Oct 14
Growing season
174 days
Hardiness zone
5b
Explore more for Chillicothe, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Princeville, Il (7.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.