Harman US

Stonington, IL Weather & Growing Conditions

This Afternoon
90°F
Cloudy
Cloudy, with a high near 90. Southwest wind around 6 mph.

7-day forecast

WhenTempForecastWindPrecip
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.