Sumner, IA Weather & Growing Conditions
Today
75°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 7am. Mostly cloudy, with a high near 75. West wind around 9 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Chance Showers And Thunderstorms | 9 mph W | 48% |
| Tonight | 60°F | Showers And Thunderstorms Likely | 5 to 8 mph NNW | 59% |
| Wednesday | 72°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 5 mph N | 23% |
| Wednesday Night | 54°F | Mostly Clear | 3 mph N | 12% |
| Thursday | 77°F | Sunny | 3 mph ESE | 2% |
| Thursday Night | 59°F | Mostly Clear | 3 mph SSE | 0% |
| Friday | 80°F | Sunny | 3 to 12 mph S | 5% |
| Friday Night | 64°F | Mostly Clear | 8 mph S | 11% |
| Saturday | 83°F | Sunny | 6 to 10 mph SSW | 10% |
| Saturday Night | 68°F | Chance Rain Showers | 8 to 13 mph S | 30% |
| Sunday | 84°F | Chance Showers And Thunderstorms | 12 mph SSE | 30% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms | 9 mph S | 38% |
| Monday | 82°F | Chance Showers And Thunderstorms | 9 to 13 mph SSE | 38% |
| Monday Night | 67°F | Slight Chance Showers And Thunderstorms | 12 mph ENE | 37% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Sumner, IA
Last spring frost
Apr 29
First fall frost
Oct 9
Growing season
162 days
Hardiness zone
5a
Explore more for Sumner, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Tripoli, Ia (7.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.