Vandalia, IL Weather & Growing Conditions
Tonight
70°F
Partly Cloudy
Partly cloudy, with a low around 70. Southeast wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Partly Cloudy | 7 mph SE | 12% |
| Saturday | 96°F | Mostly Sunny | 6 mph SW | 7% |
| Saturday Night | 71°F | Mostly Cloudy | 3 mph S | 4% |
| Sunday | 92°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 to 6 mph W | 21% |
| Sunday Night | 64°F | Chance Showers And Thunderstorms | 7 mph N | 46% |
| Monday | 79°F | Rain Showers Likely | 6 to 10 mph NE | 57% |
| Monday Night | 58°F | Showers And Thunderstorms Likely | 6 to 12 mph NE | 57% |
| Tuesday | 72°F | Chance Showers And Thunderstorms then Partly Sunny | 10 mph NE | 28% |
| Tuesday Night | 53°F | Mostly Cloudy | 5 to 10 mph N | 5% |
| Wednesday | 74°F | Mostly Sunny | 6 to 9 mph N | 3% |
| Wednesday Night | 54°F | Partly Cloudy | 2 to 8 mph N | 3% |
| Thursday | 75°F | Mostly Sunny | 2 to 8 mph N | 3% |
| Thursday Night | 56°F | Partly Cloudy | 2 to 7 mph NE | 3% |
| Friday | 76°F | Mostly Sunny | 3 to 7 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.