Vandalia, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Vandalia, a city in Fayette County, Illinois.
Today
85°F
Sunny
Sunny, with a high near 85. South wind around 3 mph.
7-day forecast for Vandalia
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 3 mph S | 0% |
| Tonight | 63°F | Mostly Clear | 0 to 3 mph SE | 0% |
| Wednesday | 87°F | Sunny | 0 to 3 mph S | 4% |
| Wednesday Night | 68°F | Partly Cloudy then Chance Showers And Thunderstorms | 3 mph S | 53% |
| Thursday | 84°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph SW | 68% |
| Thursday Night | 67°F | Chance Showers And Thunderstorms | 2 mph S | 49% |
| Friday | 84°F | Chance Showers And Thunderstorms | 3 mph SW | 38% |
| Friday Night | 68°F | Chance Showers And Thunderstorms | 1 mph S | 25% |
| Saturday | 86°F | Chance Showers And Thunderstorms | 3 mph SW | 25% |
| Saturday Night | 70°F | Mostly Clear | 3 mph S | 13% |
| Sunday | 88°F | Sunny | 3 to 9 mph SW | 7% |
| Sunday Night | 72°F | Mostly Clear | 5 to 8 mph S | 5% |
| Monday | 90°F | Mostly Sunny | 5 to 8 mph SW | 7% |
| Monday Night | 73°F | Slight Chance Showers And Thunderstorms | 7 mph SW | 18% |
Forecast source: National Weather Service (api.weather.gov) for Vandalia (38.975, -89.111). Updated through the day.
Growing snapshot for Vandalia
Last spring frost
Apr 10
First fall frost
Oct 24
Growing season
196 days
Hardiness zone
6b
More local growing data for Vandalia: nearby ZIP 62471 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Vandalia, Il (1.9 mi from Vandalia). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.