Mount Vernon, IA Weather & Growing Conditions
Today
84°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 2pm. Partly sunny. High near 84, with temperatures falling to around 81 in the afternoon. Southwest wind 5 to 10 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 34% |
| Tonight | 64°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 84% |
| Wednesday | 76°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph N | 73% |
| Wednesday Night | 59°F | Chance Showers And Thunderstorms | 0 to 5 mph N | 43% |
| Thursday | 81°F | Chance Rain Showers then Mostly Sunny | 0 to 5 mph NE | 25% |
| Thursday Night | 60°F | Mostly Clear | 0 mph | 3% |
| Friday | 83°F | Mostly Sunny | 0 to 5 mph S | 3% |
| Friday Night | 65°F | Mostly Clear | 5 mph S | 10% |
| Saturday | 86°F | Mostly Sunny | 5 mph S | 10% |
| Saturday Night | 71°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 mph S | 20% |
| Sunday | 88°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 5 to 10 mph S | 20% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 38% |
| Monday | 87°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 38% |
| Monday Night | 70°F | Chance Showers And Thunderstorms | 5 to 10 mph E | 36% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mount Vernon, IA
Last spring frost
Apr 28
First fall frost
Oct 12
Growing season
166 days
Hardiness zone
5a
Explore more for Mount Vernon, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Cedar Rapids #1, Ia (10.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.