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
85°F
Patchy Fog
Patchy fog and a chance of showers and thunderstorms. Mostly cloudy, with a high near 85. South wind 5 to 10 mph. Chance of precipitation is 40%.
7-day forecast for Mount Union
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Patchy Fog | 5 to 10 mph S | 44% |
| Tonight | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph NW | 76% |
| Sunday | 72°F | Showers And Thunderstorms | 5 to 15 mph NE | 78% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 64% |
| Monday | 65°F | Showers And Thunderstorms Likely | 15 mph NE | 64% |
| Monday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 52% |
| Tuesday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 43% |
| Tuesday Night | 48°F | Partly Cloudy | 5 to 10 mph NE | 4% |
| Wednesday | 67°F | Sunny | 5 to 10 mph NE | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 5 mph NE | 2% |
| Thursday | 70°F | Mostly Sunny | 5 mph NE | 6% |
| Thursday Night | 54°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 73°F | Mostly Sunny | 5 mph E | 5% |
| Friday Night | 55°F | Partly Cloudy | 5 mph E | 6% |
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 Sep 19, 2026.