Sumner, IA Weather & Growing Conditions
Overnight
49°F
Chance Rain Showers
A chance of rain showers. Cloudy. Low around 49, with temperatures rising to around 52 overnight. South southwest wind around 13 mph, with gusts as high as 18 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Chance Rain Showers | 13 mph SSW | 38% |
| Wednesday | 52°F | Chance Rain Showers | 14 to 20 mph WSW | 42% |
| Wednesday Night | 45°F | Rain Showers Likely | 14 to 17 mph W | 55% |
| Thursday | 51°F | Chance Rain Showers | 13 to 16 mph NW | 43% |
| Thursday Night | 37°F | Mostly Cloudy | 9 to 14 mph N | 14% |
| Friday | 46°F | Mostly Sunny | 5 to 10 mph N | 2% |
| Friday Night | 28°F | Mostly Clear | 0 to 3 mph N | 0% |
| Saturday | 50°F | Sunny | 1 to 7 mph W | 1% |
| Saturday Night | 34°F | Mostly Clear | 6 mph W | 1% |
| Sunday | 55°F | Sunny | 6 to 9 mph W | 3% |
| Sunday Night | 36°F | Clear | 5 mph SW | 0% |
| Monday | 59°F | Sunny | 5 to 13 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 7 mph W | 0% |
| Tuesday | 59°F | Sunny | 5 mph NW | 0% |
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 Nov 4, 2026.