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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

WhenTempForecastWindPrecip
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.