Dahlgren, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dahlgren, a village in Jefferson County, Illinois.
Today
98°F
Sunny
Sunny. High near 98, with temperatures falling to around 96 in the afternoon. West southwest wind 6 to 9 mph.
7-day forecast for Dahlgren
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 98°F | Sunny | 6 to 9 mph WSW | 3% |
| Tonight | 72°F | Partly Cloudy | 1 to 6 mph SSW | 2% |
| Sunday | 96°F | Mostly Sunny | 5 to 8 mph WSW | 3% |
| Sunday Night | 67°F | Partly Cloudy then Chance Showers And Thunderstorms | 7 mph N | 40% |
| Monday | 86°F | Chance Showers And Thunderstorms | 6 to 10 mph NE | 56% |
| Monday Night | 60°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 to 10 mph NE | 56% |
| Tuesday | 76°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 6 to 13 mph NNE | 53% |
| Tuesday Night | 56°F | Mostly Cloudy | 5 to 14 mph N | 3% |
| Wednesday | 76°F | Mostly Sunny | 6 to 10 mph N | 3% |
| Wednesday Night | 55°F | Partly Cloudy | 2 to 10 mph N | 1% |
| Thursday | 77°F | Mostly Sunny | 3 to 8 mph N | 0% |
| Thursday Night | 57°F | Partly Cloudy | 2 to 6 mph NNE | 0% |
| Friday | 79°F | Partly Sunny | 2 to 9 mph NNE | 4% |
| Friday Night | 57°F | Partly Cloudy | 2 to 7 mph NNE | 4% |
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 Sep 19, 2026.