Vandalia, IL Weather & Growing Conditions
Overnight
56°F
Chance Light Rain
A chance of rain. Mostly cloudy, with a low around 56. South wind 9 to 13 mph, with gusts as high as 26 mph. Chance of precipitation is 50%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Chance Light Rain | 9 to 13 mph S | 51% |
| Wednesday | 62°F | Slight Chance Light Rain then Mostly Cloudy | 7 to 13 mph SW | 19% |
| Wednesday Night | 43°F | Partly Cloudy | 6 mph SW | 1% |
| Thursday | 63°F | Mostly Sunny | 5 to 10 mph W | 0% |
| Thursday Night | 43°F | Mostly Cloudy | 3 mph NW | 1% |
| Friday | 56°F | Partly Sunny | 5 to 10 mph N | 1% |
| Friday Night | 34°F | Partly Cloudy | 2 to 7 mph N | 0% |
| Saturday | 55°F | Mostly Sunny | 5 mph N | 0% |
| Saturday Night | 32°F | Partly Cloudy | 2 mph NW | 0% |
| Sunday | 60°F | Sunny | 1 to 6 mph NW | 1% |
| Sunday Night | 33°F | Clear | 2 mph NW | 1% |
| Monday | 64°F | Sunny | 0 to 6 mph SW | 0% |
| Monday Night | 37°F | Clear | 2 mph SW | 0% |
| Tuesday | 67°F | Sunny | 1 to 5 mph W | 1% |
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 Nov 4, 2026.