Ottumwa, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Ottumwa, a city in Wapello County, Iowa.
Overnight
70°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Southeast wind around 6 mph. Chance of precipitation is 20%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Ottumwa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 70°F | Slight Chance Showers And Thunderstorms | 6 mph SE | 21% |
| Saturday | 86°F | Chance Showers And Thunderstorms | 8 mph SSW | 39% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 6 mph NNW | 69% |
| Sunday | 71°F | Rain Showers Likely then Chance Showers And Thunderstorms | 6 to 10 mph NNE | 70% |
| Sunday Night | 59°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 mph NE | 66% |
| Monday | 64°F | Rain Showers Likely | 12 mph NE | 66% |
| Monday Night | 53°F | Rain Showers Likely | 6 to 9 mph NE | 58% |
| Tuesday | 62°F | Chance Rain Showers then Partly Sunny | 9 mph NE | 38% |
| Tuesday Night | 48°F | Partly Cloudy | 6 mph NE | 3% |
| Wednesday | 66°F | Sunny | 5 mph NE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 3 mph NE | 3% |
| Thursday | 69°F | Partly Sunny | 3 mph ENE | 9% |
| Thursday Night | 56°F | Mostly Cloudy | 2 mph ENE | 6% |
| Friday | 72°F | Partly Sunny | 5 mph E | 5% |
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 Sep 19, 2026.