Darmstadt, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Darmstadt, a community in St. Clair County, Illinois.
Today
87°F
Sunny
Sunny, with a high near 87. Northeast wind around 1 mph.
7-day forecast for Darmstadt
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 1 mph NE | 0% |
| Tonight | 65°F | Mostly Clear | 2 mph SE | 0% |
| Wednesday | 89°F | Sunny | 0 to 5 mph S | 3% |
| Wednesday Night | 70°F | Partly Cloudy then Chance Showers And Thunderstorms | 5 mph S | 49% |
| Thursday | 87°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph S | 67% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 2 mph S | 54% |
| Friday | 87°F | Chance Showers And Thunderstorms | 2 mph SW | 54% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 1 mph S | 40% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 3 mph S | 40% |
| Saturday Night | 71°F | Partly Cloudy | 5 mph S | 10% |
| Sunday | 91°F | Sunny | 3 to 7 mph S | 7% |
| Sunday Night | 73°F | Mostly Clear | 5 to 8 mph S | 5% |
| Monday | 93°F | Sunny | 5 to 8 mph SW | 5% |
| Monday Night | 74°F | Partly Cloudy | 8 mph S | 11% |
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 Aug 4, 2026.