Chillicothe, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Chillicothe, a city in Peoria County, Illinois.
This Afternoon
69°F
Light Rain Likely
Rain likely and a slight chance of thunderstorms. Mostly cloudy, with a high near 69. South wind around 14 mph, with gusts as high as 28 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Chillicothe
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Light Rain Likely | 14 mph S | 72% |
| Tonight | 54°F | Light Rain | 14 mph S | 86% |
| Wednesday | 58°F | Chance Light Rain then Mostly Cloudy | 14 mph SW | 25% |
| Wednesday Night | 46°F | Mostly Cloudy | 10 mph SW | 8% |
| Thursday | 57°F | Mostly Cloudy then Slight Chance Light Rain | 7 to 12 mph WSW | 15% |
| Thursday Night | 42°F | Chance Light Rain | 6 mph NW | 29% |
| Friday | 53°F | Slight Chance Light Rain | 9 mph N | 19% |
| Friday Night | 35°F | Partly Cloudy | 0 to 7 mph N | 3% |
| Saturday | 52°F | Mostly Sunny | 0 to 3 mph WNW | 2% |
| Saturday Night | 35°F | Partly Cloudy | 2 mph W | 4% |
| Sunday | 57°F | Sunny | 2 to 7 mph W | 14% |
| Sunday Night | 35°F | Mostly Clear | 1 to 5 mph W | 4% |
| Monday | 62°F | Sunny | 2 to 9 mph SW | 2% |
| Monday Night | 40°F | Mostly Clear | 2 to 7 mph WSW | 1% |
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
Nearby towns & communities
Banner
Bartonville
Bay View Gardens
Bellevue
Brimfield
Dunlap
Elmwood
Glasford
Hanna City
Kingston Mines
Lake Camelot
Mapleton
Mossville
Norwood
Peoria
Peoria Heights
Princeville
Rome
Smithville
Spring Bay
Trivoli
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 Nov 4, 2026.