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May Weather in Dayton, United States

Last updated: June 24, 2025

In Dayton, United States, the average temperature in May hovers around 14°C (57°F). However, temperatures can vary significantly, dipping to a chilly 0°C (32°F) or rising to a warm 32°C (89°F). Expect about 53 mm (2.1 in) of precipitation spread over 9 days, contributing to an average humidity level of 77%. Stay prepared for a mix of weather this month!

May Temperature in Dayton

In May in Dayton, the average temperature is 14°C (57°F). Maximum temperatures can reach 32°C (89°F), while minimums can drop as low as 0°C (32°F). This wide range makes Dayton an ideal destination for travelers looking to experience diverse weather conditions.

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 14°C (57°F), with highs reaching up to 32°C (89°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec353441485765747262494134
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 total precipitation amount is 53 mm (2.1 in) spread over 9 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 53 mm (2.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec671057158543041526577478
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 77%. With an average temperature of 14°C (57°F), this humidity feels like a heavy blanket wrapping around you, making outdoor exploration feel muggy and leaving you craving the shade while you travel.

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 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%82%77%79%77%62%60%80%87%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec2467991097532
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 Weather1°C (35°F)67 mm (2.7 inches)85%low
February Weather1°C (34°F)105 mm (4.1 inches)86%moderate
March Weather5°C (42°F)71 mm (2.8 inches)86%high
April Weather9°C (48°F)58 mm (2.3 inches)82%high
May Weather14°C (57°F)53 mm (2.1 inches)77%very high
June Weather18°C (65°F)30 mm (1.2 inches)79%very high
July Weather23°C (74°F)4 mm (0.1 inches)77%very high
August Weather22°C (73°F)15 mm (0.6 inches)62%very high
September Weather17°C (63°F)26 mm (1.0 inches)60%high
October Weather10°C (49°F)57 mm (2.3 inches)80%moderate
November Weather5°C (41°F)74 mm (2.9 inches)87%moderate
December Weather1°C (34°F)78 mm (3.1 inches)86%low

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