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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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
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.