Harman US

Sims, IL Weather & Growing Conditions

Overnight
70°F
Mostly Clear
Mostly clear. Low around 70, with temperatures rising to around 72 overnight. South southeast wind around 1 mph.

7-day forecast

WhenTempForecastWindPrecip
Overnight 70°F Mostly Clear 1 mph SSE 2%
Saturday 98°F Sunny 1 to 7 mph SW 6%
Saturday Night 71°F Partly Cloudy 1 to 5 mph SSW 2%
Sunday 95°F Mostly Sunny 3 to 7 mph W 4%
Sunday Night 66°F Mostly Cloudy then Chance Showers And Thunderstorms 7 mph NNE 45%
Monday 82°F Showers And Thunderstorms Likely 6 to 12 mph NE 61%
Monday Night 58°F Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms 6 to 12 mph NNE 61%
Tuesday 74°F Slight Chance Showers And Thunderstorms 8 to 12 mph NNE 24%
Tuesday Night 54°F Slight Chance Showers And Thunderstorms then Mostly Cloudy 5 to 12 mph N 21%
Wednesday 75°F Mostly Sunny 6 to 10 mph N 4%
Wednesday Night 54°F Partly Cloudy 2 to 9 mph N 1%
Thursday 76°F Mostly Sunny 3 to 8 mph N 2%
Thursday Night 55°F Partly Cloudy 2 to 8 mph NNE 4%
Friday 78°F Mostly Sunny 3 to 9 mph NNE 4%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Sims, IL

Last spring frost
Apr 7
First fall frost
Oct 26
Growing season
201 days
Hardiness zone
6b

Explore more for Sims, IL: full frost dates · planting calendar · Illinois frost dates

Climate data from the nearest NOAA station, Fairfield Radio Wfiw, Il (11.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.