Dahlgren, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dahlgren, a village in Jefferson County, Illinois.
Today
87°F
Sunny
Sunny, with a high near 87. East southeast wind around 2 mph.
7-day forecast for Dahlgren
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 2 mph ESE | 0% |
| Tonight | 62°F | Mostly Clear | 2 mph SSE | 0% |
| Wednesday | 89°F | Sunny | 1 to 5 mph SSW | 1% |
| Wednesday Night | 69°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 1 to 5 mph S | 19% |
| Thursday | 86°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 3 mph SSW | 39% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 2 mph S | 47% |
| Friday | 87°F | Chance Showers And Thunderstorms | 1 to 6 mph SW | 51% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 3 mph SSW | 47% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 3 mph SW | 31% |
| Saturday Night | 70°F | Mostly Clear | 2 mph SSW | 13% |
| Sunday | 91°F | Sunny | 3 to 8 mph SSW | 10% |
| Sunday Night | 73°F | Mostly Clear | 7 mph SSW | 7% |
| Monday | 93°F | Sunny | 7 to 13 mph SSW | 7% |
| Monday Night | 75°F | Mostly Clear | 12 mph SSW | 8% |
Forecast source: National Weather Service (api.weather.gov) for Dahlgren (38.198, -88.685). Updated through the day.
Growing snapshot for Dahlgren
Last spring frost
Apr 11
First fall frost
Oct 22
Growing season
193 days
Hardiness zone
6b
More local growing data for Dahlgren: nearby ZIP 62810 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mt Vernon 3 Ne, Il (11.5 mi from Dahlgren). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.