Vandalia, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Vandalia, a city in Fayette County, Illinois.
This Afternoon
74°F
Slight Chance T-storms
A slight chance of thunderstorms and a slight chance of rain before 4pm, then a chance of rain and a slight chance of thunderstorms. Cloudy, with a high near 74. South wind around 18 mph, with gusts as high as 26 mph. Chance of precipitation is 50%.
7-day forecast for Vandalia
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Slight Chance T-storms | 18 mph S | 46% |
| Tonight | 54°F | Rain | 9 to 14 mph S | 94% |
| Wednesday | 63°F | Slight Chance Light Rain then Mostly Cloudy | 7 to 13 mph SW | 15% |
| Wednesday Night | 41°F | Partly Cloudy | 5 mph SW | 0% |
| Thursday | 65°F | Sunny | 5 to 12 mph W | 0% |
| Thursday Night | 42°F | Mostly Cloudy | 3 mph NW | 4% |
| Friday | 58°F | Mostly Cloudy | 3 to 9 mph NW | 7% |
| Friday Night | 36°F | Partly Cloudy | 1 to 6 mph N | 2% |
| Saturday | 56°F | Mostly Sunny | 3 mph NW | 0% |
| Saturday Night | 32°F | Partly Cloudy | 1 mph NW | 1% |
| Sunday | 61°F | Sunny | 1 to 7 mph W | 6% |
| Sunday Night | 32°F | Mostly Clear | 3 mph NW | 5% |
| Monday | 64°F | Sunny | 1 to 8 mph W | 2% |
| Monday Night | 37°F | Mostly Clear | 3 mph SW | 1% |
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 Nov 4, 2026.