Mount Union, IA Weather & Growing Conditions
This Afternoon
85°F
Chance Showers And Thunderstorms
A slight chance of rain showers before 4pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 85. South wind around 10 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 85°F | Chance Showers And Thunderstorms | 10 mph S | 25% |
| Tonight | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph W | 77% |
| Sunday | 73°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 mph NE | 1% |
| Wednesday Night | 51°F | Partly Cloudy | 0 to 5 mph NE | 2% |
| Thursday | 70°F | Partly 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). 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 Sep 19, 2026.