Harman US

Darmstadt, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Darmstadt, a community in St. Clair County, Illinois.

Overnight
71°F
Partly Cloudy
Partly cloudy, with a low around 71. South wind around 6 mph.

7-day forecast for Darmstadt

WhenTempForecastWindPrecip
Overnight 71°F Partly Cloudy 6 mph S 6%
Saturday 97°F Mostly Sunny 2 to 7 mph SW 6%
Saturday Night 72°F Partly Cloudy 3 mph S 3%
Sunday 94°F Mostly Sunny 2 to 6 mph W 19%
Sunday Night 67°F Mostly Cloudy then Chance Showers And Thunderstorms 5 mph N 45%
Monday 82°F Showers And Thunderstorms Likely 5 to 9 mph N 59%
Monday Night 60°F Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms 6 to 10 mph N 59%
Tuesday 72°F Slight Chance Rain Showers then Partly Sunny 8 to 12 mph N 21%
Tuesday Night 54°F Mostly Cloudy 5 to 10 mph N 7%
Wednesday 74°F Mostly Sunny 5 to 9 mph N 3%
Wednesday Night 54°F Partly Cloudy 2 to 7 mph N 2%
Thursday 76°F Mostly Sunny 2 to 7 mph N 1%
Thursday Night 57°F Partly Cloudy 2 to 6 mph N 2%
Friday 76°F Mostly Sunny 3 to 7 mph NE 4%

Forecast source: National Weather Service (api.weather.gov) for Darmstadt (38.319, -89.729). Updated through the day.

Growing snapshot for Darmstadt

Last spring frost
Apr 12
First fall frost
Oct 22
Growing season
191 days
Hardiness zone
7a

More local growing data for Darmstadt: nearby ZIP 62257 weather · frost dates · planting calendar · Illinois frost dates

Nearby towns & communities

All Illinois locations ›

Climate data from the nearest NOAA station, Sparta 1 W, Il (11.6 mi from Darmstadt). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.