Stonington, IL Weather & Growing Conditions
Today
89°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a high near 89. West southwest wind around 7 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 89°F | Chance Showers And Thunderstorms | 7 mph WSW | 32% |
| Tonight | 70°F | Mostly Cloudy | 6 mph S | 9% |
| Sunday | 86°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph NNW | 31% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 9 to 13 mph NE | 56% |
| Monday | 73°F | Showers And Thunderstorms Likely | 9 to 14 mph ENE | 65% |
| Monday Night | 55°F | Chance Rain Showers | 13 mph NE | 50% |
| Tuesday | 68°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 14 mph NE | 21% |
| Tuesday Night | 52°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 6 to 13 mph NNE | 21% |
| Wednesday | 71°F | Mostly Sunny | 10 mph NNE | 3% |
| Wednesday Night | 53°F | Partly Cloudy | 3 to 9 mph NNE | 2% |
| Thursday | 73°F | Mostly Sunny | 6 to 9 mph NNE | 2% |
| Thursday Night | 55°F | Partly Cloudy | 3 to 8 mph NNE | 2% |
| Friday | 75°F | Mostly Sunny | 5 to 9 mph NE | 2% |
| Friday Night | 54°F | Partly Cloudy | 3 to 8 mph NE | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Stonington, IL
Last spring frost
Apr 14
First fall frost
Oct 24
Growing season
192 days
Hardiness zone
6a
Explore more for Stonington, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Decatur Wtp, Il (17.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.