Stonington, IL Weather & Growing Conditions
This Afternoon
90°F
Cloudy
Cloudy, with a high near 90. Southwest wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 90°F | Cloudy | 6 mph SW | 8% |
| Tonight | 70°F | Mostly Cloudy | 6 mph S | 5% |
| Sunday | 86°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph NNW | 34% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 9 to 13 mph NE | 56% |
| Monday | 73°F | Showers And Thunderstorms Likely | 9 to 13 mph ENE | 65% |
| Monday Night | 55°F | Chance Rain Showers | 8 to 12 mph ENE | 39% |
| Tuesday | 69°F | Chance Rain Showers | 13 mph NE | 38% |
| Tuesday Night | 52°F | Mostly Cloudy | 6 to 12 mph NNE | 7% |
| Wednesday | 70°F | Partly Sunny | 7 to 10 mph NNE | 3% |
| Wednesday Night | 53°F | Partly Cloudy | 3 to 9 mph NNE | 0% |
| Thursday | 73°F | Partly Sunny | 7 mph NNE | 1% |
| Thursday Night | 56°F | Mostly Cloudy | 2 to 6 mph NNE | 9% |
| Friday | 76°F | Partly Sunny then Slight Chance Rain Showers | 3 to 7 mph NNE | 15% |
| Friday Night | 55°F | Slight Chance Rain Showers then Partly Cloudy | 6 mph NE | 15% |
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 20, 2026.