May Weather in Ottumwa, United States

Last updated: June 24, 2025

In Ottumwa, United States, the average temperature in May hovers around 17°C (64°F), with a comfortable range between a minimum of 2°C (35°F) and a scorching maximum of 37°C (98°F). Prepare for some damp days, as the region experiences approximately 151 mm (5.9 in) of precipitation over 14 days. Be ready for the humidity too, which averages a notable 77%—perfect for those who enjoy a moist, tropical vibe!

May Temperature in Ottumwa

In May in Ottumwa, the average temperature is 17°C (64°F). Maximums can reach 37°C (98°F), while minimums can drop as low as 2°C (35°F). Be prepared for a wide range of temperatures during your travels!

May Weather in Ottumwa: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Ottumwa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ottumwa, May typically has an average temperature of 17°C (64°F), with highs reaching up to 37°C (98°F) and lows dropping to around 2°C (35°F).

Data source: Temperature data for Ottumwa generated using information from the Copernicus Climate Change Service.

May Precipitation in Ottumwa

In Ottumwa in May, the total precipitation amount is 151 mm (5.9 in) spread over 14 days.

May Precipitation Trends in Ottumwa

The chart displays monthly precipitation patterns in Ottumwa, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Ottumwa, May typically receives around 151 mm (5.9 inches) of precipitation spread over approximately 14 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in Ottumwa

In Ottumwa in May, humidity is 77%. With an average temperature of 17°C (64°F), this humidity feels like a warm embrace, making traveling somewhat uncomfortable as the air can feel thick and heavy, causing sweat to linger on your skin and making you long for a refreshing breeze.

May Average Humidity in Ottumwa

This chart illustrates the average monthly humidity levels in Ottumwa, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Ottumwa is approximately 77%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Ottumwa

In Ottumwa in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Ottumwa.

Maximum UV Index Levels in Ottumwa for May

The chart shows the monthly maximum UV Index (UVI) for Ottumwa in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Ottumwa typically reaches 9, which falls under the very high exposure category.

Data source: Ottumwa May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How May Weather in Ottumwa Compares to Other Months

Weather in Ottumwa varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Ottumwa, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Ottumwa, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (24°F)	50 mm (2.0 inches)	78%	moderate
February Weather	-3°C (27°F)	50 mm (2.0 inches)	80%	moderate
March Weather	5°C (41°F)	93 mm (3.7 inches)	77%	high
April Weather	10°C (51°F)	77 mm (3.0 inches)	77%	very high
May Weather	17°C (64°F)	151 mm (5.9 inches)	77%	very high
June Weather	24°C (75°F)	137 mm (5.4 inches)	81%	extreme
July Weather	25°C (78°F)	74 mm (2.9 inches)	81%	very high
August Weather	24°C (75°F)	75 mm (3.0 inches)	77%	very high
September Weather	21°C (69°F)	129 mm (5.1 inches)	73%	very high
October Weather	12°C (54°F)	125 mm (4.9 inches)	75%	high
November Weather	4°C (40°F)	53 mm (2.1 inches)	85%	moderate
December Weather	0°C (33°F)	40 mm (1.6 inches)	83%	moderate