Vandalia, IL Weather Forecast
Local 7-day forecast
Partly Sunny 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 showers and thunderstorms after 4pm. Partly sunny, with a high near 88. Southwest wind around 5 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: Jul 10, 2026 8:52 AM CDT.
The active forecast window currently covers Jul 10 to Jul 16, 2026 for Vandalia, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 10 to Jul 16, 2026
- Latest sync
- Jul 10, 2026 8:52 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Vandalia
Wednesday looks like the warmest upcoming period in Vandalia at 90 degrees F.
Sunday Night is the coolest period ahead with temperatures near 66 degrees F.
The strongest winds are forecast for Sunday at about 3 to 8 mph NE.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 10, 2026 8:52 AM CDT
- Coverage
- 7 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 chance of showers and thunderstorms between 7pm and 10pm, then showers and thunderstorms likely between 10pm and 11pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 69. West wind around 2 mph. Chance of precipitation is 60%.
A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 84. North wind 1 to 5 mph. Chance of precipitation is 50%.
A chance of showers and thunderstorms. Partly cloudy, with a low around 67. Northeast wind 1 to 5 mph. Chance of precipitation is 30%.
A chance of rain showers. Mostly sunny, with a high near 85. Northeast wind 3 to 8 mph. Chance of precipitation is 30%.
A slight chance of rain showers before 7pm. Mostly clear, with a low around 66. Chance of precipitation is 20%.
Sunny, with a high near 87.
Mostly clear, with a low around 67.
Sunny, with a high near 88.
Mostly clear, with a low around 70.
Sunny, with a high near 90.
Mostly clear, with a low around 71.
Sunny, with a high near 90.
Mostly clear, with a low around 71.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Jul 10
|
Partly Sunny then Slight Chance Showers And Thunderstorms
|
88°F |
5 mph
SW
|
|
Tonight
Jul 10
|
Chance Showers And Thunderstorms
|
69°F |
2 mph
W
|
|
Saturday
Jul 11
|
Chance Showers And Thunderstorms
|
84°F |
1 to 5 mph
N
|
|
Saturday Night
Jul 11
|
Chance Showers And Thunderstorms
|
67°F |
1 to 5 mph
NE
|
|
Sunday
Jul 12
|
Chance Rain Showers
|
85°F |
3 to 8 mph
NE
|
|
Sunday Night
Jul 12
|
Slight Chance Rain Showers then Mostly Clear
|
66°F |
2 to 6 mph
NE
|
|
Monday
Jul 13
|
Sunny
|
87°F |
3 to 7 mph
NE
|
|
Monday Night
Jul 13
|
Mostly Clear
|
67°F |
0 to 5 mph
NE
|
|
Tuesday
Jul 14
|
Sunny
|
88°F |
1 to 5 mph
E
|
|
Tuesday Night
Jul 14
|
Mostly Clear
|
70°F |
2 mph
NE
|
|
Wednesday
Jul 15
|
Sunny
|
90°F |
0 to 3 mph
SE
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
71°F |
2 mph
S
|
|
Thursday
Jul 16
|
Sunny
|
90°F |
1 to 5 mph
SW
|
|
Thursday Night
Jul 16
|
Mostly Clear
|
71°F |
3 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Vandalia.