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May Weather in Dayton, United States

Last updated: June 24, 2025

In May, the average temperature in Dayton, United States is a pleasant 21°C (69°F). Expect temperatures to range from a cool 3°C (37°F) to a warm 33°C (92°F). During this month, precipitation averages around 133 mm (5.2 in) spread over approximately 12 days, and you'll feel the humidity at around 83%. Prepare accordingly for a mix of warmth and the occasional rain!

May Temperature in Dayton

In May in Dayton, the average temperature is 21°C (69°F). The maximum can reach 33°C (92°F), and the minimum can be as low as 3°C (37°F). This variation makes it an ideal time to explore outdoor activities while packing for both warm and cooler moments.

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 21°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec414652596975797773634945
Data source: Temperature data for Dayton generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Dayton

In Dayton in May, the precipitation amount is 133 mm (5.2 in) spread over 12 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 133 mm (5.2 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec10317317416613311913713710512974140
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Dayton

In Dayton in May, humidity is 83%. With an average temperature of 21°C (69°F), this humidity feels like a heavy blanket enveloping you, making travel feel sticky and challenging as you navigate the damp air.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
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 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109753
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.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)103 mm (4.0 inches)87%moderate
February Weather8°C (47°F)173 mm (6.8 inches)87%high
March Weather11°C (53°F)173 mm (6.8 inches)85%very high
April Weather15°C (59°F)166 mm (6.5 inches)82%very high
May Weather21°C (69°F)133 mm (5.2 inches)83%extreme
June Weather24°C (75°F)119 mm (4.7 inches)82%extreme
July Weather26°C (79°F)137 mm (5.4 inches)78%extreme
August Weather25°C (77°F)137 mm (5.4 inches)67%very high
September Weather23°C (74°F)105 mm (4.1 inches)64%very high
October Weather17°C (64°F)129 mm (5.1 inches)74%high
November Weather9°C (49°F)74 mm (2.9 inches)87%moderate
December Weather7°C (45°F)140 mm (5.5 inches)88%moderate

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