Harman US

Mount Zion, IL Weather & Growing Conditions

Today
91°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 11am and 1pm. Mostly cloudy, with a high near 91. South southwest wind around 8 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Today 91°F Slight Chance Showers And Thunderstorms 8 mph SSW 17%
Tonight 69°F Mostly Cloudy then Slight Chance Showers And Thunderstorms 7 mph SSW 16%
Sunday 83°F Chance Showers And Thunderstorms 3 to 12 mph NNW 46%
Sunday Night 59°F Chance Showers And Thunderstorms 12 to 16 mph NE 61%
Monday 70°F Showers And Thunderstorms Likely 16 mph NE 70%
Monday Night 54°F Chance Rain Showers 15 mph NE 46%
Tuesday 67°F Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms 16 mph NE 22%
Tuesday Night 51°F Slight Chance Showers And Thunderstorms then Mostly Cloudy 8 to 13 mph NNE 20%
Wednesday 70°F Mostly Sunny 12 mph NNE 4%
Wednesday Night 52°F Partly Cloudy 5 to 10 mph NNE 3%
Thursday 71°F Mostly Sunny 6 to 10 mph NNE 3%
Thursday Night 54°F Partly Cloudy 5 to 9 mph NNE 3%
Friday 74°F Mostly Sunny 6 to 10 mph NE 2%
Friday Night 53°F Partly Cloudy 5 to 9 mph NE 2%

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

Growing snapshot for Mount Zion, IL

Last spring frost
Apr 16
First fall frost
Oct 22
Growing season
187 days
Hardiness zone
6a

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

Climate data from the nearest NOAA station, Decatur Ap, Il (4.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.