Ottumwa, IA Weather & Growing Conditions
This Afternoon
86°F
Slight Chance Rain Showers
A slight chance of rain showers before 5pm. Partly sunny. High near 86, with temperatures falling to around 84 in the afternoon. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 86°F | Slight Chance Rain Showers | 10 mph SW | 17% |
| Tonight | 65°F | Showers And Thunderstorms Likely | 2 to 6 mph NNW | 79% |
| Sunday | 69°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 58% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 10 mph NE | 67% |
| Monday | 61°F | Rain Showers | 10 mph NE | 78% |
| Monday Night | 53°F | Rain Showers Likely | 9 mph NE | 66% |
| Tuesday | 60°F | Slight Chance Rain Showers | 8 mph NE | 23% |
| Tuesday Night | 49°F | Partly Cloudy | 3 to 7 mph NE | 6% |
| Wednesday | 63°F | Mostly Sunny | 5 mph NE | 0% |
| Wednesday Night | 52°F | Partly Cloudy | 3 mph ENE | 1% |
| Thursday | 67°F | Partly Sunny | 2 mph E | 11% |
| Thursday Night | 57°F | Slight Chance Rain Showers | 2 mph E | 20% |
| Friday | 70°F | Slight Chance Rain Showers | 3 mph E | 20% |
| Friday Night | 58°F | Mostly Cloudy | 2 mph E | 9% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Ottumwa, IA
Last spring frost
Apr 23
First fall frost
Oct 14
Growing season
172 days
Hardiness zone
5b
Explore more for Ottumwa, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Ottumwa Industrial Ap, Ia (4.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.