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Griswold, IA Weather & Growing Conditions

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

Today
81°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 4pm, then a slight chance of showers and thunderstorms. Partly sunny. High near 81, with temperatures falling to around 78 in the afternoon. North northwest wind around 8 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast for Griswold

WhenTempForecastWindPrecip
Today 81°F Chance Showers And Thunderstorms 8 mph NNW 25%
Tonight 61°F Chance Showers And Thunderstorms 9 mph N 35%
Sunday 66°F Chance Showers And Thunderstorms 8 to 13 mph NNE 39%
Sunday Night 56°F Chance Showers And Thunderstorms 8 to 12 mph NE 38%
Monday 61°F Rain Showers Likely 12 mph NE 55%
Monday Night 51°F Rain Showers Likely then Mostly Cloudy 5 to 10 mph NE 55%
Tuesday 61°F Partly Sunny 6 to 9 mph ENE 4%
Tuesday Night 46°F Partly Cloudy 2 to 7 mph E 2%
Wednesday 65°F Mostly Sunny 2 to 6 mph ESE 1%
Wednesday Night 51°F Partly Cloudy then Slight Chance Rain Showers 5 mph ESE 16%
Thursday 66°F Chance Rain Showers 2 to 6 mph SE 27%
Thursday Night 55°F Slight Chance Rain Showers 5 mph ESE 22%
Friday 68°F Slight Chance Rain Showers 3 to 8 mph ESE 22%
Friday Night 56°F Mostly Cloudy then Slight Chance Rain Showers 6 mph SE 15%

Forecast source: National Weather Service (api.weather.gov) for Griswold (41.234, -95.139). Updated through the day.

Growing snapshot for Griswold

Last spring frost
Apr 23
First fall frost
Oct 14
Growing season
174 days
Hardiness zone
5b

More local growing data for Griswold: nearby ZIP 51535 weather · frost dates · planting calendar · Iowa frost dates

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Climate data from the nearest NOAA station, Oakland, Ia (14.4 mi from Griswold). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.