Winterset, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winterset, a city in Madison County, Iowa.
Overnight
70°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Southwest wind around 7 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Winterset
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 70°F | Chance Showers And Thunderstorms | 7 mph SW | 37% |
| Saturday | 81°F | Chance Showers And Thunderstorms | 8 mph W | 39% |
| Saturday Night | 62°F | Chance Showers And Thunderstorms | 6 to 9 mph N | 47% |
| Sunday | 65°F | Showers And Thunderstorms Likely | 12 mph NNE | 61% |
| Sunday Night | 56°F | Showers And Thunderstorms Likely | 12 mph NE | 61% |
| Monday | 60°F | Rain Showers Likely | 12 mph NE | 66% |
| Monday Night | 52°F | Chance Rain Showers | 9 mph NE | 54% |
| Tuesday | 59°F | Partly Sunny | 8 mph NE | 13% |
| Tuesday Night | 47°F | Partly Cloudy | 6 mph ENE | 3% |
| Wednesday | 63°F | Mostly Sunny | 5 mph E | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 3 mph ESE | 5% |
| Thursday | 65°F | Slight Chance Rain Showers | 5 mph ESE | 19% |
| Thursday Night | 56°F | Mostly Cloudy | 3 mph ESE | 16% |
| Friday | 67°F | Partly Sunny | 6 mph ESE | 16% |
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 Sep 19, 2026.