Ottumwa (IA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Ottumwa.
Climate overview of Ottumwa
The climate in Ottumwa, Iowa, United States of America, is marked by large temperature swings across the seasons, ranging from 30°C (86°F) in July to 0°C (32°F) in January.
With around 1041 mm (41 in) of annual rain/snowfall, Ottumwa has a notably wet climate. However, this rain/snowfall is not evenly distributed — the city has warm summers and very cold winters. The wettest month is June.
Ottumwa Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Ottumwa - and find the best time to visit.
Monthly Temperature in Ottumwa
In Ottumwa, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a comfortable 30°C (86°F) in July. In January, the coolest month of the year, temperatures drop to a very cold 0°C (32°F).
At night, temperatures range from around 18°C (64°F) in July to -10°C (14°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Ottumwa
Ottumwa experiences significant rain/snowfall throughout the year, averaging 1041 mm (41 in) of precipitation annually. Ottumwa can be quite wet during June, receiving approximately 157 mm (6.2 in) of precipitation over 13 rainy days.
In contrast, during the driest month (January), you will experience much drier conditions, with 24 mm (0.9 in) of precipitation spread across 8 snowy days. For more details, please visit our Ottumwa Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Ottumwa
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: September
- Warmest weather: July and August
- Fewer rainy days: January, February, September, November and December
- Wettest months: April, May, June, July and August, when rainfall is highest.
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -10°C (14°F).
Frequently asked questions about the climate in Ottumwa
What is the best time to visit Ottumwa?
September typically offers the most optimal weather in Ottumwa. In contrast, January, February, March and December tend to have less optimal conditions. Ottumwa has warm summers and very cold winters.
What temperatures can I expect in Ottumwa?
Daytime highs range from 0°C (32°F) in January to 30°C (86°F) in July. Nighttime lows range from -10°C (14°F) to 18°C (64°F). Temperatures vary considerably through the year.
How much rain does Ottumwa get?
Annual rainfall is around 1041 mm (41 in). June is the wettest month with 157 mm (6.2 in), while January is the driest with 24 mm (0.9 in).
Ottumwa 3-Day Forecast
Ottumwa (IA) 3-Day Forecast
Ottumwa on the map
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