Weather in Mount Vernon, IL
Updated 2026-09-26 12:30 local time · ZIP codes 62864
Overcast
No government weather alerts were returned for this location at the latest update.
Next hours
69°10% rain69°10% rain69°10% rain68°10% rain68°10% rain68°10% rain68°10% rain
68°11% rain68°11% rain67°11% rain67°11% rain
66°7% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Key weather changes ahead
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 11%).
It feels like 64°F with winds near 7 mph.
69°F, 10% rain chance and 4 mph wind.
Visibility is around 6 mi; gusts may reach 15 mph.
Current temperature is 69°F, wind 7 mph, rain chance up to 11%.
UV index is 3.
Local weather characteristics in Mount Vernon
Illinois has four distinct seasons with hot, humid summers, cold winters, strong frontal changes and frequent spring and summer thunderstorms.
Mount Vernon is part of the Midwest weather region. The forecast point is near 38.32°N latitude and 88.91°W longitude. Local temperature, wind and precipitation can still differ from nearby places, especially where terrain, coastlines or urban development create small-scale weather changes.
Mount Vernon weather today
Overcast and 69°F in Mount Vernon, IL. Today's high is 70°F with a 10% rain chance. Winds are around 7 mph with gusts near 8 mph. Relative humidity is 37%, pressure is 30.13 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Mount Vernon
Sunrise is at 06:47 AM and sunset is at 06:46 PM. Tomorrow's forecast calls for Sunny with a high near 80°F and a low near 59°F. The maximum rain chance is 5%.