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
88°F
Mostly Sunny
Mostly sunny, with a high near 88. South wind 5 to 10 mph.
7-day forecast for Mount Union
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Mostly Sunny | 5 to 10 mph S | 14% |
| Tonight | 67°F | Chance Showers And Thunderstorms | 5 to 10 mph NE | 51% |
| Wednesday | 79°F | Showers And Thunderstorms Likely | 5 mph NE | 81% |
| Wednesday Night | 62°F | Showers And Thunderstorms | 5 mph N | 76% |
| Thursday | 81°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 mph NE | 58% |
| Thursday Night | 62°F | Mostly Clear | 0 to 5 mph E | 6% |
| Friday | 83°F | Mostly Sunny | 0 to 5 mph SE | 5% |
| Friday Night | 65°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph SE | 15% |
| Saturday | 87°F | Sunny | 5 mph S | 14% |
| Saturday Night | 71°F | Mostly Clear | 5 to 10 mph S | 9% |
| Sunday | 89°F | Sunny | 10 to 15 mph SW | 9% |
| Sunday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 10 mph S | 23% |
| Monday | 88°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph S | 23% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph S | 28% |
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 Aug 4, 2026.