Tonica, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Tonica, a village in Lasalle County, Illinois.
Today
83°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Cloudy, with a high near 83. East southeast wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Tonica
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Showers And Thunderstorms Likely | 5 mph ESE | 63% |
| Tonight | 67°F | Showers And Thunderstorms Likely | 5 mph WSW | 86% |
| Sunday | 72°F | Showers And Thunderstorms Likely | 5 to 15 mph NNE | 65% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms | 15 mph ENE | 48% |
| Monday | 65°F | Rain Showers Likely | 15 mph ENE | 61% |
| Monday Night | 53°F | Chance Rain Showers | 10 to 15 mph NE | 44% |
| Tuesday | 64°F | Slight Chance Rain Showers | 10 to 15 mph NE | 23% |
| Tuesday Night | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 15 mph NNE | 17% |
| Wednesday | 67°F | Mostly Sunny | 5 to 10 mph NNE | 5% |
| Wednesday Night | 53°F | Partly Cloudy | 5 to 10 mph NNE | 1% |
| Thursday | 69°F | Mostly Sunny | 5 to 10 mph NNE | 2% |
| Thursday Night | 54°F | Partly Cloudy | 5 mph NE | 2% |
| Friday | 73°F | Mostly Sunny | 5 mph NE | 3% |
| Friday Night | 53°F | Partly Cloudy | 5 mph NE | 2% |
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 Sep 19, 2026.