Tonica, IL Weather & Growing Conditions
This Afternoon
61°F
Slight Chance Rain Showers
A slight chance of rain showers and a slight chance of drizzle. Cloudy. High near 61, with temperatures falling to around 55 in the afternoon. West southwest wind around 15 mph, with gusts as high as 25 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 61°F | Slight Chance Rain Showers | 15 mph WSW | 9% |
| Tonight | 47°F | Slight Chance Rain Showers then Cloudy | 10 to 15 mph SW | 7% |
| Thursday | 55°F | Mostly Cloudy then Chance Rain | 10 to 15 mph W | 41% |
| Thursday Night | 40°F | Chance Rain then Mostly Cloudy | 10 mph NNW | 30% |
| Friday | 49°F | Partly Sunny | 5 to 10 mph N | 2% |
| Friday Night | 31°F | Mostly Clear | 0 to 5 mph NNW | 0% |
| Saturday | 52°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 33°F | Mostly Clear | 0 to 5 mph W | 0% |
| Sunday | 58°F | Sunny | 5 to 10 mph W | 0% |
| Sunday Night | 35°F | Mostly Clear | 0 to 5 mph W | 0% |
| Monday | 62°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 40°F | Clear | 5 mph WSW | 0% |
| Tuesday | 63°F | Sunny | 5 mph WNW | 2% |
| Tuesday Night | 39°F | Partly Cloudy | 0 mph | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Tonica, IL
Last spring frost
Apr 24
First fall frost
Oct 18
Growing season
176 days
Hardiness zone
5b
Explore more for Tonica, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Peru, Il (10.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.