Harman US

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

WhenTempForecastWindPrecip
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.