Winthrop, IA Weather & Growing Conditions
Today
78°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 10am. Partly sunny. High near 78, with temperatures falling to around 76 in the afternoon. West wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Chance Showers And Thunderstorms | 5 to 10 mph W | 49% |
| Tonight | 62°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 74% |
| Wednesday | 73°F | Chance Showers And Thunderstorms | 5 mph N | 50% |
| Wednesday Night | 55°F | Slight Chance Rain Showers | 5 mph N | 24% |
| Thursday | 78°F | Sunny | 0 to 5 mph E | 8% |
| Thursday Night | 60°F | Mostly Clear | 0 to 5 mph SE | 1% |
| Friday | 81°F | Sunny | 0 to 10 mph S | 3% |
| Friday Night | 65°F | Mostly Clear | 5 mph S | 10% |
| Saturday | 84°F | Mostly Sunny | 5 to 10 mph S | 11% |
| Saturday Night | 69°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 10 to 15 mph S | 21% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms | 10 mph S | 21% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 10 mph S | 41% |
| Monday | 84°F | Chance Showers And Thunderstorms | 10 mph S | 41% |
| Monday Night | 69°F | Slight Chance Showers And Thunderstorms | 10 mph SE | 38% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Winthrop, IA
Last spring frost
Apr 30
First fall frost
Oct 7
Growing season
159 days
Hardiness zone
5a
Explore more for Winthrop, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Independence #1, Ia (10.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.