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May Weather in Bethesda, United States

Last updated: June 24, 2025

In Bethesda, United States, the average temperature in May is a mild 17°C (63°F). However, be prepared for a wide range, as temperatures can dip to a brisk -2°C (29°F) or soar to a warm 31°C (88°F). Expect about 141 mm (5.6 in) of precipitation spread over 16 days, accompanied by an average humidity of 82%. Stay cozy or cool, depending on the day!

May Temperature in Bethesda

In May in Bethesda, the average temperature is 17°C (63°F). Maximum temperatures can reach 31°C (88°F), while minimum temperatures can drop to as low as -2°C (29°F). Travelers should be prepared for a range of weather conditions, from warm days to chilly nights.

May Weather in Bethesda: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Bethesda, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bethesda, May typically has an average temperature of 17°C (63°F), with highs reaching up to 31°C (88°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec323643526370757368584337
Data source: Temperature data for Bethesda 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 Bethesda

In Bethesda in May, the precipitation amount is 141 mm (5.6 in) over the course of 16 days.

May Precipitation Trends in Bethesda

The chart displays monthly precipitation patterns in Bethesda, 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 Bethesda, May typically receives around 141 mm (5.6 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec931211191421411651339511412092114
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Bethesda

In Bethesda in May, humidity is 82%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket wrapping around you—comfortable yet heavy, making outdoor activities more taxing and requiring frequent breaks for hydration.

May Average Humidity in Bethesda

This chart illustrates the average monthly humidity levels in Bethesda, 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 Bethesda is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%88%87%82%84%82%73%74%81%89%86%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Bethesda

In Bethesda 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 Bethesda.

Maximum UV Index Levels in Bethesda for May

The chart shows the monthly maximum UV Index (UVI) for Bethesda 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 Bethesda typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
Data source: Bethesda 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 Bethesda Compares to Other Months

Weather in Bethesda varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Bethesda, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Bethesda, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)93 mm (3.7 inches)88%moderate
February Weather2°C (36°F)121 mm (4.8 inches)88%moderate
March Weather6°C (43°F)119 mm (4.7 inches)88%high
April Weather11°C (52°F)142 mm (5.6 inches)86%very high
May Weather17°C (63°F)141 mm (5.6 inches)82%very high
June Weather21°C (71°F)165 mm (6.5 inches)84%very high
July Weather24°C (75°F)133 mm (5.2 inches)82%very high
August Weather23°C (73°F)95 mm (3.7 inches)73%very high
September Weather20°C (68°F)114 mm (4.5 inches)73%very high
October Weather14°C (58°F)120 mm (4.7 inches)81%high
November Weather6°C (43°F)92 mm (3.6 inches)89%moderate
December Weather3°C (37°F)114 mm (4.5 inches)86%moderate

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