Mount Vernon, IA Weather & Growing Conditions
Tonight
50°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 5am. Mostly cloudy. Low around 50, with temperatures rising to around 52 overnight. South wind 10 to 15 mph. Chance of precipitation is 50%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Chance Showers And Thunderstorms | 10 to 15 mph S | 54% |
| Wednesday | 54°F | Chance Rain Showers | 15 mph SW | 38% |
| Wednesday Night | 45°F | Slight Chance Rain Showers | 10 to 15 mph SW | 24% |
| Thursday | 53°F | Rain Showers Likely | 10 mph W | 61% |
| Thursday Night | 41°F | Slight Chance Rain Showers then Mostly Cloudy | 5 mph N | 20% |
| Friday | 51°F | Partly Sunny | 5 to 10 mph N | 5% |
| Friday Night | 34°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph W | 2% |
| Saturday Night | 36°F | Mostly Clear | 0 to 5 mph W | 4% |
| Sunday | 59°F | Sunny | 5 mph W | 8% |
| Sunday Night | 37°F | Mostly Clear | 0 to 5 mph SW | 3% |
| Monday | 63°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 62°F | Sunny | 5 mph NW | 0% |
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 Nov 4, 2026.