Vergennes, IL Weather & Growing Conditions
This Afternoon
98°F
Mostly Sunny
Mostly sunny. High near 98, with temperatures falling to around 96 in the afternoon. West southwest wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 98°F | Mostly Sunny | 7 mph WSW | 1% |
| Tonight | 72°F | Mostly Clear | 5 mph SSW | 2% |
| Sunday | 96°F | Mostly Sunny | 6 mph WSW | 2% |
| Sunday Night | 68°F | Partly Cloudy then Chance Showers And Thunderstorms | 5 mph NNE | 35% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 3 to 8 mph NE | 58% |
| Monday Night | 61°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 3 to 8 mph NNE | 58% |
| Tuesday | 76°F | Chance Showers And Thunderstorms then Partly Sunny | 6 to 12 mph NNE | 49% |
| Tuesday Night | 56°F | Partly Cloudy | 3 to 12 mph N | 2% |
| Wednesday | 75°F | Mostly Sunny | 6 to 10 mph N | 1% |
| Wednesday Night | 54°F | Partly Cloudy | 2 to 8 mph N | 0% |
| Thursday | 77°F | Mostly Sunny | 3 to 8 mph N | 1% |
| Thursday Night | 57°F | Partly Cloudy | 1 to 6 mph NNE | 1% |
| Friday | 79°F | Mostly Sunny then Slight Chance Rain Showers | 2 to 8 mph NNE | 15% |
| Friday Night | 57°F | Slight Chance Rain Showers then Partly Cloudy | 2 to 6 mph NE | 15% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Vergennes, IL
Last spring frost
Apr 6
First fall frost
Oct 22
Growing season
199 days
Hardiness zone
7a
Explore more for Vergennes, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Du Quoin 4 Se, Il (10.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.