Ottumwa, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Ottumwa, a city in Wapello County, Iowa.
This Afternoon
70°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 5pm, then a chance of showers and thunderstorms. Mostly cloudy. High near 70, with temperatures falling to around 64 in the afternoon. South southeast wind around 12 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Ottumwa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Showers And Thunderstorms Likely | 12 mph SSE | 72% |
| Tonight | 49°F | Chance Rain Showers then Mostly Cloudy | 6 to 9 mph SSW | 28% |
| Wednesday | 55°F | Mostly Cloudy | 9 to 13 mph WSW | 11% |
| Wednesday Night | 44°F | Mostly Cloudy | 9 mph WSW | 4% |
| Thursday | 54°F | Mostly Cloudy then Chance Rain Showers | 9 mph WNW | 30% |
| Thursday Night | 42°F | Chance Rain Showers then Mostly Cloudy | 6 mph NNW | 31% |
| Friday | 53°F | Partly Sunny | 7 mph N | 10% |
| Friday Night | 35°F | Mostly Cloudy | 0 to 3 mph NNW | 1% |
| Saturday | 56°F | Partly Sunny | 0 to 3 mph W | 1% |
| Saturday Night | 37°F | Mostly Clear | 3 mph W | 3% |
| Sunday | 62°F | Sunny | 6 mph WNW | 7% |
| Sunday Night | 38°F | Mostly Clear | 3 mph WSW | 2% |
| Monday | 66°F | Sunny | 3 to 8 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 5 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Ottumwa (41.022, -92.423). Updated through the day.
Growing snapshot for Ottumwa
Last spring frost
Apr 23
First fall frost
Oct 14
Growing season
172 days
Hardiness zone
5b
More local growing data for Ottumwa: nearby ZIP 52501 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Ottumwa Industrial Ap, Ia (4.5 mi from Ottumwa). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.