Winterset, IA Weather & Growing Conditions
Tonight
62°F
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
A chance of showers and thunderstorms before midnight, then showers and thunderstorms likely between midnight and 3am, then a chance of showers and thunderstorms. Some of the storms could produce heavy rain. Mostly cloudy. Low around 62, with temperatures rising to around 64 overnight. North wind 7 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between three quarters and one inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 62°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 7 to 10 mph N | 69% |
| Sunday | 64°F | Chance Rain Showers | 8 to 12 mph NNE | 45% |
| Sunday Night | 57°F | Rain Showers | 10 mph NE | 76% |
| Monday | 58°F | Rain Showers | 10 mph NE | 81% |
| Monday Night | 53°F | Rain Showers Likely | 9 mph NNE | 68% |
| Tuesday | 59°F | Slight Chance Rain Showers then Mostly Cloudy | 8 mph NE | 15% |
| Tuesday Night | 47°F | Mostly Cloudy | 6 mph NE | 1% |
| Wednesday | 62°F | Mostly Sunny | 5 mph ENE | 0% |
| Wednesday Night | 52°F | Partly Cloudy | 3 mph ESE | 9% |
| Thursday | 66°F | Slight Chance Rain Showers | 5 mph SE | 24% |
| Thursday Night | 58°F | Chance Rain Showers | 3 mph SE | 25% |
| Friday | 68°F | Slight Chance Rain Showers | 5 mph ESE | 23% |
| Friday Night | 59°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph ESE | 16% |
| Saturday | 69°F | Chance Rain Showers | 7 mph SE | 30% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Winterset, IA
Last spring frost
Apr 30
First fall frost
Oct 3
Growing season
157 days
Hardiness zone
5b
Explore more for Winterset, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Winterset 1S, Ia (1.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.