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May Weather in Dayton, United States

Last updated: June 24, 2025

In Dayton, United States, the average temperature in May sits at a mild 17°C (63°F). However, be prepared for a range of conditions, as temperatures can dip to a chilly -1°C (30°F) or rise to a warm 31°C (89°F). Expect 128 mm (5.0 in) of precipitation spread over 14 days, contributing to an average humidity of 78%. Whether you're planning for a cozy sweater or light layers, this month has a little bit of everything!

May Temperature in Dayton

In May in Dayton, the average temperature is 17°C (63°F). The maximum can reach 31°C (89°F), and the minimum can be as low as -1°C (30°F). This makes Dayton a versatile destination for travelers, offering the chance to experience both warm and cool weather.

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 31°C (89°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec333843536370757267574338
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 128 mm (5.0 in) over a span of 14 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 128 mm (5.0 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec64906910712899761151121127085
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 78%. With an average temperature of 17°C (63°F), this humidity feels like a warm, enveloping blanket, making traveling slightly uncomfortable as you navigate the sticky air, prompting the need for frequent breaks in cooler, shaded areas.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
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.
JanFebMarAprMayJunJulAugSepOctNovDec36710111111109753
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 (33°F)64 mm (2.5 inches)86%moderate
February Weather4°C (39°F)90 mm (3.6 inches)86%high
March Weather6°C (44°F)69 mm (2.7 inches)86%high
April Weather12°C (53°F)107 mm (4.2 inches)84%very high
May Weather17°C (63°F)128 mm (5.0 inches)78%extreme
June Weather21°C (70°F)99 mm (3.9 inches)79%extreme
July Weather24°C (75°F)76 mm (3.0 inches)70%extreme
August Weather22°C (72°F)115 mm (4.5 inches)59%very high
September Weather19°C (67°F)112 mm (4.4 inches)68%very high
October Weather14°C (58°F)112 mm (4.4 inches)80%high
November Weather6°C (43°F)70 mm (2.7 inches)86%moderate
December Weather3°C (38°F)85 mm (3.3 inches)85%moderate

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