Winterset, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winterset, a city in Madison County, Iowa.
This Afternoon
65°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 1pm, then showers and thunderstorms. Mostly cloudy. High near 65, with temperatures falling to around 59 in the afternoon. North northwest wind around 10 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Winterset
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 65°F | Chance Showers And Thunderstorms | 10 mph NNW | 86% |
| Tonight | 45°F | Showers And Thunderstorms | 10 to 14 mph NW | 80% |
| Wednesday | 52°F | Mostly Cloudy then Slight Chance Rain Showers | 14 to 17 mph W | 15% |
| Wednesday Night | 43°F | Mostly Cloudy | 13 mph W | 14% |
| Thursday | 52°F | Chance Rain Showers | 12 mph NW | 49% |
| Thursday Night | 40°F | Mostly Cloudy | 9 mph NNW | 12% |
| Friday | 52°F | Partly Sunny | 5 to 8 mph N | 3% |
| Friday Night | 35°F | Mostly Cloudy | 3 mph NW | 0% |
| Saturday | 57°F | Mostly Sunny | 5 mph WSW | 1% |
| Saturday Night | 38°F | Mostly Clear | 3 to 7 mph W | 4% |
| Sunday | 63°F | Sunny | 6 mph W | 6% |
| Sunday Night | 40°F | Mostly Clear | 8 mph SW | 1% |
| Monday | 65°F | Sunny | 8 to 12 mph SW | 0% |
| Monday Night | 43°F | Mostly Clear | 7 mph WNW | 0% |
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 Nov 3, 2026.