May Weather in Dayton, United States

Last updated: June 24, 2025

In Dayton, United States, the average temperature in May hovers around 17°C (63°F), with a range that can dip to a chilly 1°C (35°F) and soar up to a warm 35°C (95°F). Expect an average precipitation of 127 mm (5.0 in) spread across 13 days, contributing to the region’s overall 69% humidity.

May Temperature in Dayton

In May in Dayton, the average temperature is 17°C (63°F). The maximum can reach 35°C (95°F), while the minimum can be as low as 1°C (35°F). This variation makes it essential for travelers to pack both lightweight clothing for the warm days and warmer layers for the cooler evenings.

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 17°C (63°F), with highs reaching up to 35°C (95°F) and lows dropping to around 1°C (35°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 total precipitation amount is 127 mm (5.0 in) spread over 13 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 127 mm (5.0 inches) of precipitation spread over approximately 13 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 69%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making outdoor activities feel slightly heavier, yet still comfortable for exploring.

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 69%, 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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 10, 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	2°C (35°F)	63 mm (2.5 inches)	84%	moderate
February Weather	3°C (39°F)	109 mm (4.3 inches)	82%	moderate
March Weather	6°C (44°F)	107 mm (4.2 inches)	81%	high
April Weather	12°C (54°F)	107 mm (4.2 inches)	78%	very high
May Weather	17°C (63°F)	127 mm (5.0 inches)	69%	very high
June Weather	23°C (73°F)	97 mm (3.8 inches)	69%	very high
July Weather	26°C (79°F)	138 mm (5.4 inches)	62%	very high
August Weather	25°C (76°F)	131 mm (5.2 inches)	65%	very high
September Weather	21°C (71°F)	88 mm (3.5 inches)	68%	very high
October Weather	16°C (61°F)	132 mm (5.2 inches)	74%	high
November Weather	8°C (47°F)	83 mm (3.3 inches)	82%	moderate
December Weather	4°C (39°F)	102 mm (4.0 inches)	80%	low