Darmstadt, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Darmstadt, a community in St. Clair County, Illinois.
This Afternoon
97°F
Mostly Sunny
Mostly sunny, with a high near 97. Heat index values as high as 102. West wind 3 to 7 mph.
7-day forecast for Darmstadt
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 97°F | Mostly Sunny | 3 to 7 mph W | 10% |
| Tonight | 72°F | Partly Cloudy | 3 mph S | 2% |
| Sunday | 94°F | Mostly Sunny | 2 to 6 mph W | 4% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 3 to 7 mph NE | 59% |
| Monday | 82°F | Showers And Thunderstorms Likely | 3 to 8 mph NE | 57% |
| Monday Night | 59°F | Chance Showers And Thunderstorms | 3 to 8 mph NE | 47% |
| Tuesday | 73°F | Chance Showers And Thunderstorms then Partly Sunny | 6 to 12 mph N | 39% |
| Tuesday Night | 54°F | Mostly Cloudy | 3 to 10 mph N | 1% |
| Wednesday | 74°F | Mostly Sunny | 6 to 9 mph N | 0% |
| Wednesday Night | 53°F | Partly Cloudy | 2 to 7 mph N | 0% |
| Thursday | 76°F | Mostly Sunny | 2 to 6 mph N | 1% |
| Thursday Night | 57°F | Mostly Cloudy | 1 to 5 mph N | 4% |
| Friday | 79°F | Slight Chance Rain Showers | 1 to 6 mph NE | 15% |
| Friday Night | 56°F | Slight Chance Rain Showers then Partly Cloudy | 5 mph NE | 15% |
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
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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.