Mount Vernon, IL Weather Forecast
Local 7-day forecast
Slight Chance Rain Showers then Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Mount Vernon, IL in one place.
A slight chance of rain showers between 9am and 1pm, then a chance of showers and thunderstorms between 2pm and 4pm, then a chance of showers and thunderstorms between 4pm and 5pm, then a slight chance of showers and thunderstorms. Partly sunny. High near 83, with temperatures falling to around 81 in the afternoon. South southwest wind 13 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 40%.
Local Weather Overview
This forecast page for Mount Vernon, 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 15, 2026 8:20 AM CDT.
The active forecast window currently covers Apr 15 to Apr 21, 2026 for Mount Vernon, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 15 to Apr 21, 2026
- Latest sync
- Apr 15, 2026 8:20 AM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Mount Vernon
Friday looks like the warmest upcoming period in Mount Vernon at 86 degrees F.
Sunday Night is the coolest period ahead with temperatures near 39 degrees F.
The strongest winds are forecast for Today at about 13 to 18 mph SSW.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 15, 2026 8:20 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- PAH
- Radar station
- KVWX
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 before 7pm, then a chance of showers and thunderstorms between 10pm and 2am, then showers and thunderstorms between 2am and 5am, then a chance of showers and thunderstorms. Mostly cloudy. Low around 64, with temperatures rising to around 67 overnight. South southwest wind 9 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.
Showers and thunderstorms likely. Mostly sunny, with a high near 81. Southwest wind 9 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.
Showers and thunderstorms likely before 7pm, then a slight chance of showers and thunderstorms between 7pm and 1am. Mostly clear, with a low around 60. South southwest wind 2 to 8 mph. Chance of precipitation is 60%.
A chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 86. South wind 2 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 10pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 58. South southwest wind around 12 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Showers and thunderstorms likely. Partly sunny, with a high near 72. West southwest wind 13 to 17 mph, with gusts as high as 24 mph.
A chance of showers and thunderstorms. Partly cloudy, with a low around 40. West northwest wind 8 to 13 mph, with gusts as high as 21 mph.
A slight chance of rain showers before 7am. Sunny, with a high near 62. West northwest wind 8 to 13 mph, with gusts as high as 20 mph.
Clear, with a low around 39. North wind 3 to 8 mph.
Sunny, with a high near 69. South wind 3 to 9 mph.
Mostly clear, with a low around 48. South wind around 7 mph.
Sunny, with a high near 75. South southwest wind 6 to 13 mph, with gusts as high as 20 mph.
Mostly clear, with a low around 56. South southwest wind around 9 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Apr 15
|
Slight Chance Rain Showers then Chance Showers And Thunderstorms
|
83°F |
13 to 18 mph
SSW
|
|
Tonight
Apr 15
|
Chance Showers And Thunderstorms
|
64°F |
9 to 16 mph
SSW
|
|
Thursday
Apr 16
|
Showers And Thunderstorms Likely
|
81°F |
9 to 14 mph
SW
|
|
Thursday Night
Apr 16
|
Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms
|
60°F |
2 to 8 mph
SSW
|
|
Friday
Apr 17
|
Mostly Sunny then Chance Showers And Thunderstorms
|
86°F |
2 to 13 mph
S
|
|
Friday Night
Apr 17
|
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
58°F |
12 mph
SSW
|
|
Saturday
Apr 18
|
Showers And Thunderstorms Likely
|
72°F |
13 to 17 mph
WSW
|
|
Saturday Night
Apr 18
|
Chance Showers And Thunderstorms
|
40°F |
8 to 13 mph
WNW
|
|
Sunday
Apr 19
|
Slight Chance Rain Showers then Sunny
|
62°F |
8 to 13 mph
WNW
|
|
Sunday Night
Apr 19
|
Clear
|
39°F |
3 to 8 mph
N
|
|
Monday
Apr 20
|
Sunny
|
69°F |
3 to 9 mph
S
|
|
Monday Night
Apr 20
|
Mostly Clear
|
48°F |
7 mph
S
|
|
Tuesday
Apr 21
|
Sunny
|
75°F |
6 to 13 mph
SSW
|
|
Tuesday Night
Apr 21
|
Mostly Clear
|
56°F |
9 mph
SSW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Mount Vernon.
