May Weather in Dayton, United States

Last updated: June 24, 2025

In Dayton, United States, the average temperature in May hovers around 10°C (50°F), with a minimum dropping to -4°C (24°F) and a maximum soaring to 27°C (82°F). Expect 109 mm (4.3 in) of precipitation spread over 19 days, coupled with an average humidity of 75%. Stay prepared for a mix of conditions!

May Temperature in Dayton

In May in Dayton, the average temperature is 10°C (50°F). Maximum can reach 27°C (82°F) and minimum can be as low as -4°C (24°F). This diverse range of temperatures makes Dayton a destination for travelers who appreciate both mild days and crisp nights.

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

The chart illustrates May temperature patterns in Dayton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Dayton, May typically has an average temperature of 10°C (50°F), with highs reaching up to 27°C (82°F) and lows dropping to around -4°C (24°F).

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

May Precipitation in Dayton

In Dayton in May, the precipitation amount is 109 mm (4.3 in) over the course of 19 days.

May Precipitation Trends in Dayton

The chart displays monthly precipitation patterns in Dayton, 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 Dayton, May typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 19 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 Dayton

In Dayton in May humidity is 75%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration uncomfortable and necessitating extra layers for warmth and comfort.

May Average Humidity in Dayton

This chart illustrates the average monthly humidity levels in Dayton, 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 Dayton is approximately 75%, 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 Dayton

In Dayton 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 Dayton.

Maximum UV Index Levels in Dayton for May

The chart shows the monthly maximum UV Index (UVI) for Dayton 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 Dayton typically reaches 9, which falls under the very high exposure category.

Data source: Dayton 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 Dayton Compares to Other Months

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

This table compares monthly weather conditions in Dayton, 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 (25°F)	26 mm (1.0 inches)	78%	moderate
February Weather	-7°C (20°F)	45 mm (1.8 inches)	79%	moderate
March Weather	0°C (33°F)	56 mm (2.2 inches)	71%	high
April Weather	4°C (39°F)	97 mm (3.8 inches)	70%	very high
May Weather	10°C (50°F)	109 mm (4.3 inches)	75%	very high
June Weather	16°C (61°F)	84 mm (3.3 inches)	82%	extreme
July Weather	20°C (69°F)	63 mm (2.5 inches)	84%	very high
August Weather	19°C (66°F)	48 mm (1.9 inches)	85%	very high
September Weather	14°C (58°F)	63 mm (2.5 inches)	79%	very high
October Weather	5°C (41°F)	67 mm (2.6 inches)	75%	moderate
November Weather	0°C (33°F)	37 mm (1.5 inches)	75%	moderate
December Weather	-3°C (27°F)	35 mm (1.4 inches)	81%	low