Mount Vernon, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Vernon, a city in Linn County, Iowa.
Today
85°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 3pm. Partly sunny. High near 85, with temperatures falling to around 82 in the afternoon. West wind 5 to 10 mph. Chance of precipitation is 30%.
7-day forecast for Mount Vernon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph W | 33% |
| Tonight | 64°F | Chance Showers And Thunderstorms then 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 | 44% |
| Thursday | 80°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 | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 mph S | 20% |
| Sunday | 87°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 | 86°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) for Mount Vernon (41.924, -91.424). Updated through the day.
Growing snapshot for Mount Vernon
Last spring frost
Apr 28
First fall frost
Oct 12
Growing season
166 days
Hardiness zone
5a
More local growing data for Mount Vernon: nearby ZIP 52314 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Alburnett
Bertram
Cedar Rapids
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Hiawatha
Marion
Palo
Prairieburg
Robins
Springville
Walker
Climate data from the nearest NOAA station, Cedar Rapids #1, Ia (10.7 mi from Mount Vernon). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.