Darmstadt, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Darmstadt, a community in St. Clair County, Illinois.
Tonight
55°F
Rain
Rain before 3am, then a slight chance of drizzle. Mostly cloudy, with a low around 55. Southwest wind 7 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
7-day forecast for Darmstadt
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Rain | 7 to 14 mph SW | 84% |
| Wednesday | 64°F | Slight Chance Drizzle then Mostly Cloudy | 5 to 12 mph W | 11% |
| Wednesday Night | 43°F | Mostly Clear | 5 mph SW | 0% |
| Thursday | 66°F | Sunny | 3 to 9 mph W | 0% |
| Thursday Night | 44°F | Mostly Cloudy | 3 mph NW | 6% |
| Friday | 59°F | Mostly Cloudy | 5 to 10 mph NW | 4% |
| Friday Night | 39°F | Partly Cloudy | 5 mph N | 1% |
| Saturday | 56°F | Partly Sunny | 1 to 5 mph NW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 1 mph NW | 0% |
| Sunday | 62°F | Sunny | 1 to 6 mph W | 6% |
| Sunday Night | 35°F | Mostly Clear | 2 mph NW | 5% |
| Monday | 66°F | Sunny | 1 to 7 mph W | 2% |
| Monday Night | 39°F | Mostly Clear | 2 mph SW | 0% |
| Tuesday | 69°F | Sunny | 5 mph W | 0% |
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 Nov 4, 2026.