Vandalia, IL Weather Forecast
Local 7-day forecast
Showers And Thunderstorms Likely
Track current conditions, temperature changes, wind, and the full daily outlook for Vandalia, IL in one place.
A chance of rain showers between 7am and 10am, then showers and thunderstorms likely. Partly sunny, with a high near 79. East wind around 6 mph. Chance of precipitation is 60%.
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: May 24, 2026 12:34 PM CDT.
The active forecast window currently covers May 26 to May 30, 2026 for Vandalia, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 26 to May 30, 2026
- Latest sync
- May 24, 2026 12:34 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Vandalia
Thursday looks like the warmest upcoming period in Vandalia at 83 degrees F.
Saturday Night is the coolest period ahead with temperatures near 58 degrees F.
The strongest winds are forecast for Saturday at about 10 mph NE.
Precipitation is mentioned in 10 upcoming forecast periods.
Forecast Details
- Last updated
- May 24, 2026 12:34 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
Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms between 7pm and 10pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Showers and thunderstorms likely. Partly sunny, with a high near 82. Chance of precipitation is 60%.
Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 65. Chance of precipitation is 60%.
A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83. 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 before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 78. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 59. Chance of precipitation is 40%.
A slight chance of rain showers before 7am, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 76. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 58. Chance of precipitation is 20%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
May 26
|
Showers And Thunderstorms Likely
|
79°F |
6 mph
E
|
|
Tuesday Night
May 26
|
Showers And Thunderstorms Likely
|
65°F |
5 mph
SE
|
|
Wednesday
May 27
|
Showers And Thunderstorms Likely
|
82°F |
5 mph
S
|
|
Wednesday Night
May 27
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
65°F |
3 mph
E
|
|
Thursday
May 28
|
Partly Sunny then Chance Showers And Thunderstorms
|
83°F |
5 mph
E
|
|
Thursday Night
May 28
|
Chance Showers And Thunderstorms
|
64°F |
6 mph
E
|
|
Friday
May 29
|
Chance Showers And Thunderstorms
|
78°F |
6 to 9 mph
E
|
|
Friday Night
May 29
|
Chance Showers And Thunderstorms
|
59°F |
9 mph
NE
|
|
Saturday
May 30
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
76°F |
10 mph
NE
|
|
Saturday Night
May 30
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
58°F |
8 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Vandalia.