May Weather in Dayton, United States

Last updated: June 24, 2025

In May, the average temperature in Dayton, United States hovers around 18°C (64°F). However, be prepared for a range; temperatures can dip as low as -2°C (29°F) or soar up to 34°C (94°F). Precipitation is notable, with around 143 mm (5.6 in) of rain falling over 15 days, contributing to a high average humidity of 81%.

May Temperature in Dayton

In May in Dayton, the average temperature is 18°C (64°F). Maximums can reach 34°C (94°F), while minimums can drop as low as -2°C (29°F). This climate offers a diverse range of experiences for travelers, so be sure to pack accordingly for fluctuating temperatures.

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 18°C (64°F), with highs reaching up to 34°C (94°F) and lows dropping to around -2°C (29°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 143 mm (5.6 in) spread over 15 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 143 mm (5.6 inches) of precipitation spread over approximately 15 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 81%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel both refreshing and slightly stifling at the same time.

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 81%, 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 (29°F)	76 mm (3.0 inches)	85%	moderate
February Weather	0°C (32°F)	79 mm (3.1 inches)	85%	moderate
March Weather	6°C (42°F)	107 mm (4.2 inches)	86%	high
April Weather	11°C (52°F)	92 mm (3.6 inches)	87%	very high
May Weather	18°C (64°F)	143 mm (5.6 inches)	81%	very high
June Weather	23°C (74°F)	95 mm (3.7 inches)	82%	very high
July Weather	25°C (77°F)	92 mm (3.6 inches)	81%	very high
August Weather	23°C (74°F)	86 mm (3.4 inches)	79%	very high
September Weather	21°C (70°F)	63 mm (2.5 inches)	78%	very high
October Weather	14°C (58°F)	105 mm (4.1 inches)	81%	high
November Weather	5°C (42°F)	76 mm (3.0 inches)	89%	moderate
December Weather	2°C (36°F)	64 mm (2.5 inches)	86%	low