Harman US

Thor, IA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Thor, a city in Humboldt County, Iowa.

Today
75°F
Patchy Fog
Patchy fog and a chance of showers and thunderstorms before 4pm. Mostly cloudy. High near 75, with temperatures falling to around 73 in the afternoon. North wind 5 to 9 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast for Thor

WhenTempForecastWindPrecip
Today 75°F Patchy Fog 5 to 9 mph N 38%
Tonight 58°F Slight Chance Rain Showers 9 to 13 mph NNE 18%
Sunday 67°F Chance Drizzle 15 mph NE 28%
Sunday Night 53°F Chance Rain Showers 12 mph ENE 46%
Monday 61°F Chance Rain Showers 9 to 13 mph ENE 50%
Monday Night 48°F Chance Rain Showers 6 to 9 mph ENE 39%
Tuesday 61°F Mostly Sunny 7 mph ENE 8%
Tuesday Night 44°F Mostly Clear 2 to 6 mph E 0%
Wednesday 66°F Sunny 5 mph ESE 1%
Wednesday Night 49°F Partly Cloudy 3 mph ESE 12%
Thursday 68°F Slight Chance Rain Showers 2 to 6 mph SE 16%
Thursday Night 53°F Mostly Cloudy 3 mph SE 7%
Friday 70°F Partly Sunny 2 to 7 mph SE 7%
Friday Night 54°F Mostly Cloudy 5 mph SE 11%

Forecast source: National Weather Service (api.weather.gov) for Thor (42.688, -94.050). Updated through the day.

Growing snapshot for Thor

Last spring frost
Apr 26
First fall frost
Oct 12
Growing season
169 days
Hardiness zone
5a

More local growing data for Thor: nearby ZIP 50591 weather · frost dates · planting calendar · Iowa frost dates

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Climate data from the nearest NOAA station, Dakota City, Ia (7.9 mi from Thor). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.