Tonica, IL Weather & Growing Conditions
This Afternoon
78°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Cloudy, with a high near 78. South southeast wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Slight Chance Showers And Thunderstorms | 5 mph SSE | 21% |
| Tonight | 67°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph E | 82% |
| Sunday | 70°F | Showers And Thunderstorms Likely | 5 to 15 mph NNE | 71% |
| Sunday Night | 58°F | Chance Rain Showers | 10 to 15 mph ENE | 44% |
| Monday | 65°F | Rain Showers Likely | 15 mph ENE | 60% |
| Monday Night | 54°F | Chance Rain Showers | 10 to 15 mph ENE | 53% |
| Tuesday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 53% |
| Tuesday Night | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 15 mph NE | 16% |
| Wednesday | 66°F | Partly Sunny | 5 to 10 mph NNE | 5% |
| Wednesday Night | 54°F | Mostly Cloudy | 5 to 10 mph NNE | 3% |
| Thursday | 69°F | Mostly Sunny | 5 mph NNE | 4% |
| Thursday Night | 55°F | Mostly Cloudy | 0 to 5 mph NE | 8% |
| Friday | 72°F | Partly Sunny | 0 to 5 mph NE | 7% |
| Friday Night | 54°F | Partly Cloudy | 0 to 5 mph NE | 7% |
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 Sep 19, 2026.