Harman US

Arion, IA Weather & Growing Conditions

This Afternoon
72°F
Mostly Cloudy
Mostly cloudy. High near 72, with temperatures falling to around 70 in the afternoon. North wind around 9 mph.

7-day forecast

WhenTempForecastWindPrecip
This Afternoon 72°F Mostly Cloudy 9 mph N 14%
Tonight 59°F Mostly Cloudy 6 to 9 mph NNE 14%
Sunday 62°F Chance Drizzle then Chance Rain Showers 7 to 12 mph NE 43%
Sunday Night 53°F Rain Showers Likely 6 to 9 mph NE 69%
Monday 56°F Rain Showers 9 mph NE 83%
Monday Night 49°F Rain Showers Likely then Mostly Cloudy 3 to 7 mph NE 64%
Tuesday 59°F Mostly Cloudy 3 to 7 mph ENE 2%
Tuesday Night 45°F Partly Cloudy 3 mph E 0%
Wednesday 64°F Mostly Sunny 1 to 5 mph ESE 2%
Wednesday Night 51°F Mostly Cloudy then Slight Chance Showers And Thunderstorms 3 mph SE 24%
Thursday 66°F Chance Showers And Thunderstorms 2 to 7 mph SSE 36%
Thursday Night 56°F Slight Chance Rain Showers 1 to 5 mph SE 23%
Friday 68°F Slight Chance Rain Showers 1 to 6 mph ESE 19%
Friday Night 58°F Mostly Cloudy then Chance Rain Showers 3 mph ESE 27%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Arion, IA

Last spring frost
Apr 27
First fall frost
Oct 11
Growing season
166 days
Hardiness zone
5b

Explore more for Arion, IA: full frost dates · planting calendar · Iowa frost dates

Climate data from the nearest NOAA station, Denison, Ia (8.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.