Vandalia, IL Weather & Growing Conditions
Overnight
71°F
Mostly Clear
Mostly clear, with a low around 71. Southeast wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 71°F | Mostly Clear | 5 mph SE | 3% |
| Saturday | 95°F | Mostly Sunny | 2 to 6 mph SW | 11% |
| Saturday Night | 71°F | Partly Cloudy | 3 mph SW | 4% |
| Sunday | 91°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 2 to 7 mph NW | 31% |
| Sunday Night | 64°F | Showers And Thunderstorms Likely | 5 to 8 mph NE | 55% |
| Monday | 76°F | Showers And Thunderstorms Likely | 7 to 12 mph NE | 71% |
| Monday Night | 56°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 6 to 12 mph NE | 71% |
| Tuesday | 70°F | Slight Chance Rain Showers | 10 mph NE | 21% |
| Tuesday Night | 53°F | Partly Cloudy | 5 to 10 mph N | 11% |
| Wednesday | 73°F | Mostly Sunny | 6 to 9 mph N | 5% |
| Wednesday Night | 53°F | Partly Cloudy | 2 to 8 mph N | 2% |
| Thursday | 75°F | Mostly Sunny | 3 to 8 mph N | 2% |
| Thursday Night | 55°F | Partly Cloudy | 2 to 7 mph NE | 2% |
| Friday | 77°F | Mostly Sunny | 3 to 8 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Vandalia, IL
Last spring frost
Apr 10
First fall frost
Oct 24
Growing season
196 days
Hardiness zone
6b
Explore more for Vandalia, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Vandalia, Il (1.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.