Griswold, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Griswold, a city in Cass County, Iowa.
This Afternoon
82°F
Slight Chance Showers And Thunderstorms
A chance of rain showers before 4pm, then a slight chance of showers and thunderstorms. Partly sunny. High near 82, with temperatures falling to around 76 in the afternoon. North northwest wind 5 to 9 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Griswold
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 82°F | Slight Chance Showers And Thunderstorms | 5 to 9 mph NNW | 28% |
| Tonight | 61°F | Chance Showers And Thunderstorms | 7 to 10 mph N | 51% |
| Sunday | 66°F | Slight Chance Drizzle then Chance Rain Showers | 8 to 13 mph NNE | 39% |
| Sunday Night | 56°F | Rain Showers Likely | 7 to 12 mph NE | 59% |
| Monday | 59°F | Rain Showers | 12 mph NE | 75% |
| Monday Night | 51°F | Rain Showers Likely then Mostly Cloudy | 6 to 10 mph NE | 63% |
| Tuesday | 61°F | Mostly Cloudy | 8 mph NE | 3% |
| Tuesday Night | 46°F | Partly Cloudy | 2 to 7 mph ENE | 2% |
| Wednesday | 64°F | Mostly Sunny | 2 to 6 mph E | 1% |
| Wednesday Night | 52°F | Mostly Cloudy | 5 mph ESE | 13% |
| Thursday | 67°F | Chance Rain Showers | 3 to 7 mph SE | 34% |
| Thursday Night | 57°F | Chance Rain Showers | 5 mph SE | 28% |
| Friday | 69°F | Slight Chance Rain Showers | 2 to 6 mph ESE | 19% |
| Friday Night | 59°F | Mostly Cloudy then Chance Rain Showers | 5 mph ESE | 26% |
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
Nearby towns & communities
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.