Chillicothe, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Chillicothe, a city in Peoria County, Illinois.
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. South southwest wind around 6 mph.
7-day forecast for Chillicothe
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 6 mph SSW | 0% |
| Tonight | 67°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph S | 21% |
| Wednesday | 82°F | Chance Showers And Thunderstorms | 2 to 6 mph SSW | 48% |
| Wednesday Night | 66°F | Showers And Thunderstorms | 1 to 5 mph N | 86% |
| Thursday | 80°F | Showers And Thunderstorms Likely | 3 mph S | 74% |
| Thursday Night | 64°F | Partly Cloudy | 2 mph SE | 14% |
| Friday | 83°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 mph S | 19% |
| Friday Night | 66°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 1 mph NNW | 19% |
| Saturday | 86°F | Mostly Sunny | 2 to 6 mph SSW | 10% |
| Saturday Night | 71°F | Mostly Clear | 2 to 7 mph S | 10% |
| Sunday | 88°F | Sunny | 7 to 10 mph SSW | 8% |
| Sunday Night | 72°F | Slight Chance Showers And Thunderstorms | 6 to 9 mph SSW | 24% |
| Monday | 88°F | Slight Chance Showers And Thunderstorms | 6 to 10 mph SSW | 24% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 9 mph SW | 32% |
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
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Bay View Gardens
Bellevue
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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 Aug 4, 2026.