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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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
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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.