Tonica, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Tonica, a village in Lasalle County, Illinois.
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. South southwest wind around 5 mph, with gusts as high as 15 mph.
7-day forecast for Tonica
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 5 mph SSW | 1% |
| Tonight | 68°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph S | 15% |
| Wednesday | 82°F | Chance Showers And Thunderstorms | 5 mph WSW | 54% |
| Wednesday Night | 66°F | Showers And Thunderstorms | 0 to 5 mph NW | 88% |
| Thursday | 80°F | Chance Showers And Thunderstorms | 0 to 5 mph SE | 69% |
| Thursday Night | 64°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph ESE | 24% |
| Friday | 82°F | Mostly Sunny | 0 mph | 11% |
| Friday Night | 65°F | Mostly Clear | 0 to 5 mph S | 11% |
| Saturday | 85°F | Mostly Sunny | 5 mph SSW | 8% |
| Saturday Night | 71°F | Mostly Clear | 5 to 10 mph SSW | 8% |
| Sunday | 87°F | Sunny | 10 to 15 mph SSW | 10% |
| Sunday Night | 71°F | Slight Chance Showers And Thunderstorms | 10 mph SSW | 26% |
| Monday | 87°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 10 mph SSW | 26% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 mph SW | 36% |
Forecast source: National Weather Service (api.weather.gov) for Tonica (41.216, -89.070). Updated through the day.
Growing snapshot for Tonica
Last spring frost
Apr 24
First fall frost
Oct 18
Growing season
176 days
Hardiness zone
5b
More local growing data for Tonica: nearby ZIP 61370 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Cedar Point
Dana
Dayton
Earlville
Grand Ridge
Harding
Kangley
LaSalle
Leland
Leonore
Lostant
Marseilles
Mendota
Millington
Naplate
Newark
North Utica
Oglesby
Ottawa
Peru
Ransom
Rutland
Seneca
Serena
Sheridan
Streator
Triumph
Troy Grove
Wedron
Wenona
Climate data from the nearest NOAA station, Peru, Il (10.3 mi from Tonica). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.