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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

WhenTempForecastWindPrecip
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.