Winterset, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winterset, a city in Madison County, Iowa.
Today
84°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 9am. Partly sunny. High near 84, with temperatures falling to around 81 in the afternoon. West northwest wind 6 to 9 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Winterset
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Chance Showers And Thunderstorms | 6 to 9 mph WNW | 43% |
| Tonight | 63°F | Showers And Thunderstorms | 7 to 10 mph NNE | 90% |
| Wednesday | 72°F | Showers And Thunderstorms Likely | 7 mph NE | 67% |
| Wednesday Night | 58°F | Chance Showers And Thunderstorms | 2 to 6 mph NE | 36% |
| Thursday | 80°F | Mostly Sunny | 3 mph ENE | 7% |
| Thursday Night | 62°F | Mostly Clear | 3 mph SE | 4% |
| Friday | 85°F | Sunny | 3 to 7 mph S | 4% |
| Friday Night | 67°F | Mostly Clear | 6 mph S | 10% |
| Saturday | 88°F | Sunny | 6 to 10 mph SSW | 5% |
| Saturday Night | 73°F | Mostly Clear | 9 to 15 mph SSW | 10% |
| Sunday | 89°F | Mostly Sunny | 14 mph S | 10% |
| Sunday Night | 72°F | Slight Chance Showers And Thunderstorms | 14 mph SSE | 25% |
| Monday | 90°F | Chance Showers And Thunderstorms then Mostly Sunny | 12 to 15 mph SSW | 25% |
| Monday Night | 73°F | Chance Showers And Thunderstorms | 15 mph SSE | 25% |
Forecast source: National Weather Service (api.weather.gov) for Winterset (41.350, -94.018). Updated through the day.
Growing snapshot for Winterset
Last spring frost
Apr 30
First fall frost
Oct 3
Growing season
157 days
Hardiness zone
5b
More local growing data for Winterset: nearby ZIP 50273 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Winterset 1S, Ia (1.8 mi from Winterset). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.