Mount Union, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Union, a community in Henry County, Iowa.
Today
53°F
Slight Chance Rain Showers then Cloudy
A slight chance of rain showers before 9am. Cloudy, with a high near 53. West wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
7-day forecast for Mount Union
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 53°F | Slight Chance Rain Showers then Cloudy | 15 mph W | 18% |
| Tonight | 45°F | Mostly Cloudy | 10 to 15 mph SW | 8% |
| Thursday | 55°F | Rain Showers Likely | 10 to 15 mph W | 63% |
| Thursday Night | 42°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NW | 16% |
| Friday | 50°F | Partly Sunny | 5 to 10 mph N | 6% |
| Friday Night | 31°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph NW | 1% |
| Saturday Night | 34°F | Mostly Clear | 0 to 5 mph W | 1% |
| Sunday | 57°F | Sunny | 5 mph W | 1% |
| Sunday Night | 36°F | Clear | 0 to 5 mph W | 0% |
| Monday | 64°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 41°F | Clear | 5 mph W | 0% |
| Tuesday | 64°F | Sunny | 5 mph NW | 0% |
| Tuesday Night | 42°F | Partly Cloudy | 0 mph | 1% |
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.