Harman US

Seymour, IA Weather & Growing Conditions

Tonight
70°F
Mostly Cloudy then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 4am. Mostly cloudy. Low around 70, with temperatures rising to around 72 overnight. South wind around 8 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Tonight 70°F Mostly Cloudy then Slight Chance Showers And Thunderstorms 8 mph S 19%
Saturday 85°F Chance Showers And Thunderstorms 6 to 10 mph SW 28%
Saturday Night 64°F Chance Showers And Thunderstorms then Showers And Thunderstorms Likely 2 to 6 mph NNW 72%
Sunday 72°F Showers And Thunderstorms Likely 6 to 10 mph NNE 64%
Sunday Night 59°F Showers And Thunderstorms Likely 10 mph NE 64%
Monday 62°F Rain Showers Likely 12 mph NE 58%
Monday Night 53°F Chance Rain Showers 7 to 10 mph NE 50%
Tuesday 60°F Slight Chance Rain Showers 9 mph NE 16%
Tuesday Night 48°F Mostly Cloudy 2 to 6 mph NE 4%
Wednesday 63°F Mostly Sunny 5 mph NE 1%
Wednesday Night 52°F Partly Cloudy 2 mph ENE 3%
Thursday 66°F Partly Sunny 3 mph E 10%
Thursday Night 55°F Mostly Cloudy then Slight Chance Rain Showers 1 mph E 15%
Friday 68°F Slight Chance Rain Showers 1 to 5 mph E 15%

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

Growing snapshot for Seymour, IA

Last spring frost
Apr 21
First fall frost
Oct 19
Growing season
178 days
Hardiness zone
5b

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

Climate data from the nearest NOAA station, Allerton, Ia (12.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.