Griswold, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Griswold, a city in Cass County, Iowa.
Today
83°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 1pm. Partly sunny. High near 83, with temperatures falling to around 80 in the afternoon. North wind 5 to 12 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Griswold
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 12 mph N | 45% |
| Tonight | 61°F | Showers And Thunderstorms | 7 to 12 mph NNE | 83% |
| Wednesday | 73°F | Chance Showers And Thunderstorms | 10 mph NE | 49% |
| Wednesday Night | 57°F | Partly Cloudy | 1 to 8 mph ENE | 14% |
| Thursday | 82°F | Sunny | 1 to 5 mph E | 3% |
| Thursday Night | 62°F | Mostly Clear | 3 mph SE | 6% |
| Friday | 86°F | Sunny | 2 to 9 mph S | 6% |
| Friday Night | 67°F | Mostly Clear | 7 mph S | 7% |
| Saturday | 90°F | Sunny | 3 to 13 mph S | 3% |
| Saturday Night | 72°F | Mostly Clear | 13 mph S | 10% |
| Sunday | 91°F | Mostly Sunny | 10 to 14 mph S | 9% |
| Sunday Night | 72°F | Slight Chance Showers And Thunderstorms | 15 mph S | 23% |
| Monday | 91°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 13 to 16 mph S | 19% |
| Monday Night | 73°F | Chance Showers And Thunderstorms | 10 to 16 mph SE | 25% |
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 Aug 4, 2026.