Mount Vernon, IL Weather & Growing Conditions
Today
88°F
Sunny
Sunny, with a high near 88. Wind around 0 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 0 mph | 0% |
| Tonight | 64°F | Mostly Clear | 1 mph ENE | 0% |
| Wednesday | 90°F | Sunny | 0 mph | 0% |
| Wednesday Night | 69°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 2 mph S | 18% |
| Thursday | 88°F | Chance Showers And Thunderstorms | 3 mph SSW | 42% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 2 mph S | 60% |
| Friday | 88°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 3 mph WSW | 60% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 1 mph WNW | 42% |
| Saturday | 89°F | Chance Showers And Thunderstorms | 2 mph SW | 42% |
| Saturday Night | 70°F | Partly Cloudy | 2 mph SSW | 13% |
| Sunday | 91°F | Mostly Sunny | 2 to 7 mph SSW | 8% |
| Sunday Night | 72°F | Mostly Clear | 6 mph SSW | 4% |
| Monday | 93°F | Sunny | 3 to 7 mph SSW | 6% |
| Monday Night | 73°F | Partly Cloudy | 6 mph SSW | 10% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mount Vernon, IL
Last spring frost
Apr 11
First fall frost
Oct 22
Growing season
193 days
Hardiness zone
6b
Explore more for Mount Vernon, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Mt Vernon 3 Ne, Il (2.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.