Mount Union, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Union, a community in Henry County, Iowa.
This Afternoon
53°F
Slight Chance Drizzle
A slight chance of drizzle. Cloudy, with a high near 53. West wind around 15 mph, with gusts as high as 25 mph.
7-day forecast for Mount Union
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 53°F | Slight Chance Drizzle | 15 mph W | 12% |
| Tonight | 46°F | Slight Chance Drizzle | 10 to 15 mph SW | 13% |
| Thursday | 52°F | Chance Rain Showers | 10 to 15 mph W | 35% |
| Thursday Night | 40°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph N | 18% |
| Friday | 48°F | Mostly Sunny | 5 to 10 mph N | 2% |
| Friday Night | 29°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 33°F | Mostly Clear | 0 to 5 mph W | 0% |
| Sunday | 59°F | Sunny | 5 mph W | 0% |
| Sunday Night | 36°F | Clear | 0 to 5 mph SW | 0% |
| Monday | 65°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 41°F | Clear | 5 mph W | 0% |
| Tuesday | 63°F | Sunny | 5 mph NW | 2% |
| Tuesday Night | 41°F | Mostly Clear | 0 mph | 2% |
Forecast source: National Weather Service (api.weather.gov) for Mount Union (41.058, -91.391). Updated through the day.
Growing snapshot for Mount Union
Last spring frost
Apr 30
First fall frost
Oct 10
Growing season
163 days
Hardiness zone
5b
More local growing data for Mount Union: nearby ZIP 52644 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mt Pleasant 1 Ssw, Ia (10 mi from Mount Union). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.