Ottumwa, Iowa Weather
Ottumwa weather this week
Over the next 7 days in Ottumwa, daytime highs range from 10°C to 20°C and night-time lows from -3°C to 9°C. The warmest afternoon is likely on Friday at 20°C, while the coolest night is expected tonight at -3°C. Temperatures trend warmer through the week, rising by about 6°C. Expect a wide gap of around 13°C between afternoon and early-morning temperatures, so mornings will feel noticeably cooler.
Rain is most likely Saturday, with roughly 5.4 mm forecast in total over the week.
It turns breezy on Saturday, with winds reaching about 32 km/h — secure loose objects on rooftops and balconies. UV levels stay moderate or lower, peaking at 3. Average humidity is a comfortable 60% or so.
| Day | Conditions | High / Low | Rain chance | Rain | Max wind |
|---|---|---|---|---|---|
| Today (Sunday) | Overcast | 10° / -3° | 0% | 0.0 mm | 8 km/h |
| Tomorrow (Monday) | Overcast | 13° / -2° | 0% | 0.0 mm | 15 km/h |
| Tuesday | Overcast | 14° / 2° | 0% | 0.0 mm | 24 km/h |
| Wednesday | Overcast | 16° / 7° | 7% | 0.0 mm | 32 km/h |
| Thursday | Clear sky | 17° / 9° | 17% | 0.0 mm | 30 km/h |
| Friday | Overcast | 20° / 9° | 22% | 0.0 mm | 27 km/h |
| Saturday | Rain showers | 17° / 8° | 56% | 5.4 mm | 32 km/h |
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Ottumwa air quality & conditions
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Today's outlook for Ottumwa
At 00:00 local time it is -1°C in Ottumwa under clear skies, feeling like -4°C. Today's forecast high is 10°C and the low is -3°C, and the day overall looks overcast. Rain is unlikely today (0% chance). Winds are blowing at about 3 km/h from the south-east. Humidity is 78%.
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Climate of Ottumwa: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Ottumwa, with average daytime highs around 31°C. January is the coolest, when nights typically fall to about -9°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 40°C, so the seasons feel very different from each other.
The area receives about 950 mm of rain in a typical year. Most of it falls from May to June and August, and June is the wettest month at roughly 136 mm.
For outdoor plans and travel, July and September usually offer the most comfortable weather in Ottumwa, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 0° | -9° | 29 mm | 84% |
| Feb | 2° | -9° | 38 mm | 81% |
| Mar | 10° | -2° | 57 mm | 77% |
| Apr | 17° | 4° | 92 mm | 73% |
| May | 23° | 11° | 122 mm | 75% |
| Jun | 28° | 17° | 136 mm | 75% |
| Jul | 31° | 19° | 97 mm | 71% |
| Aug | 29° | 18° | 114 mm | 71% |
| Sep | 25° | 13° | 90 mm | 71% |
| Oct | 17° | 5° | 78 mm | 73% |
| Nov | 10° | -1° | 48 mm | 78% |
| Dec | 2° | -7° | 45 mm | 84% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Ottumwa. Values describe typical conditions, not a forecast.
About Ottumwa weather
Ottumwa is set in Iowa's humid continental climate, typical of the US corn belt, about 119 km south-east of Des Moines. Summers bring warm, humid summers (June–August). The year winds down with cold winters (December–February) with regular snow. This page shows live, auto-refreshing weather for Ottumwa: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Chicago.
Frequently asked questions
Ottumwa is about 119 km south-east of Des Moines, in Iowa.
Ottumwa sees cold winters (December–February) with regular snow.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Ottumwa's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Ottumwa, with average daytime highs of about 31°C and nights around 19°C.
The coldest nights come in January, when the average low is about -9°C and daytime highs reach around 0°C. Frost is possible on clear, calm nights.
Ottumwa receives about 950 mm of rain in a typical year. June is the wettest month at roughly 136 mm, and the main rainy period is May to June and August.
July and September usually offer the most comfortable weather in Ottumwa, with mild daytime temperatures and little rain.
In November Ottumwa typically sees daytime highs near 10°C and lows near -1°C, with about 48 mm of rain over the month and average humidity around 78%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Ottumwa is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Ottumwa's day-to-day weather follows the broader pattern of Iowa described above. See the hourly weather forecast or the air quality index for more detail.