Mount Union, IA Weather & Growing Conditions
Overnight
50°F
Mostly Cloudy
Mostly cloudy, with a low around 50. West wind 10 to 15 mph, with gusts as high as 25 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 50°F | Mostly Cloudy | 10 to 15 mph W | 7% |
| Wednesday | 53°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph W | 17% |
| Wednesday Night | 45°F | Mostly Cloudy | 10 mph SW | 8% |
| Thursday | 55°F | Rain Showers Likely | 10 to 15 mph W | 62% |
| 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 | 58°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 | 40°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 64°F | Sunny | 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mount Union, IA
Last spring frost
Apr 30
First fall frost
Oct 10
Growing season
163 days
Hardiness zone
5b
Explore more for Mount Union, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Mt Pleasant 1 Ssw, Ia (10 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.