Vandalia, IL Weather Forecast
Local 7-day forecast
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Vandalia, IL in one place.
A slight chance of rain showers before 4pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 70. East wind around 7 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Vandalia, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Apr 9, 2026 3:37 PM CDT.
The active forecast window currently covers Apr 11 to Apr 15, 2026 for Vandalia, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 11 to Apr 15, 2026
- Latest sync
- Apr 9, 2026 3:37 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Vandalia
Tuesday looks like the warmest upcoming period in Vandalia at 82 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 57 degrees F.
The strongest winds are forecast for Sunday at about 9 to 21 mph S.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 9, 2026 3:37 PM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KILX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 58. Chance of precipitation is 20%.
Mostly cloudy, with a high near 77.
A chance of rain showers between 7pm and 1am, then showers and thunderstorms likely. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.
Showers and thunderstorms likely before 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 80. Chance of precipitation is 60%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.
A chance of showers and thunderstorms. Partly sunny, with a high near 82. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 50%.
A chance of showers and thunderstorms. Mostly cloudy, with a high near 79. Chance of precipitation is 50%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 57. Chance of precipitation is 40%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Apr 11
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
70°F |
7 mph
E
|
|
Saturday Night
Apr 11
|
Slight Chance Showers And Thunderstorms then Mostly Cloudy
|
58°F |
6 to 9 mph
SE
|
|
Sunday
Apr 12
|
Mostly Cloudy
|
77°F |
9 to 21 mph
S
|
|
Sunday Night
Apr 12
|
Showers And Thunderstorms Likely
|
62°F |
16 mph
SW
|
|
Monday
Apr 13
|
Showers And Thunderstorms Likely
|
80°F |
14 to 17 mph
SW
|
|
Monday Night
Apr 13
|
Chance Showers And Thunderstorms
|
66°F |
15 mph
S
|
|
Tuesday
Apr 14
|
Chance Showers And Thunderstorms
|
82°F |
13 to 18 mph
SW
|
|
Tuesday Night
Apr 14
|
Chance Showers And Thunderstorms
|
64°F |
15 mph
S
|
|
Wednesday
Apr 15
|
Chance Showers And Thunderstorms
|
79°F |
14 to 17 mph
SW
|
|
Wednesday Night
Apr 15
|
Chance Showers And Thunderstorms
|
57°F |
8 to 13 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Vandalia.