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May Weather in Black Diamond, United States

Last updated: June 24, 2025

In May, the average temperature in Black Diamond, United States is a pleasant 12°C (54°F). Temperatures can range from a chilly 0°C (32°F) to a warm 29°C (85°F). Expect some rain, with precipitation averaging 84 mm (3.3 in) over approximately 13 days. The humidity runs high at 81%, adding a bit of mugginess to the air.

May Temperature in Black Diamond

In May in Black Diamond, the average temperature is 12°C (54°F). Maximums can reach 29°C (85°F), and minimums can be as low as 0°C (32°F). This diverse range of temperatures makes it essential to pack layers when traveling to Black Diamond during this time.

May Weather in Black Diamond: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Black Diamond, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Black Diamond, May typically has an average temperature of 12°C (54°F), with highs reaching up to 29°C (85°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec393742475458636458484338
Data source: Temperature data for Black Diamond 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 Black Diamond

In Black Diamond in May, the precipitation amount is 84 mm (3.3 in) during 13 days, indicating a relatively wet period for that time of year.

May Precipitation Trends in Black Diamond

The chart displays monthly precipitation patterns in Black Diamond, 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 Black Diamond, May typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec20624616014284752121105197223244
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Black Diamond

In Black Diamond in May humidity is 81%. With an average temperature of 12°C (54°F), this humidity feels like a damp blanket enveloping you, making travel sluggish and uncomfortable as you battle the stickiness while trying to enjoy your surroundings.

May Average Humidity in Black Diamond

This chart illustrates the average monthly humidity levels in Black Diamond, 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 Black Diamond is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%87%84%81%82%79%63%62%83%89%88%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Black Diamond

In Black Diamond 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 Black Diamond.

Maximum UV Index Levels in Black Diamond for May

The chart shows the monthly maximum UV Index (UVI) for Black Diamond 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 Black Diamond typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235699987532
Data source: Black Diamond 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 Black Diamond Compares to Other Months

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

This table compares monthly weather conditions in Black Diamond, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)206 mm (8.1 inches)86%low
February Weather3°C (37°F)246 mm (9.7 inches)86%moderate
March Weather5°C (42°F)160 mm (6.3 inches)87%moderate
April Weather8°C (47°F)142 mm (5.6 inches)84%high
May Weather12°C (54°F)84 mm (3.3 inches)81%very high
June Weather15°C (59°F)75 mm (2.9 inches)82%very high
July Weather17°C (64°F)21 mm (0.8 inches)79%very high
August Weather18°C (64°F)21 mm (0.8 inches)63%very high
September Weather15°C (59°F)105 mm (4.1 inches)62%high
October Weather9°C (48°F)197 mm (7.7 inches)83%moderate
November Weather6°C (43°F)223 mm (8.8 inches)89%moderate
December Weather4°C (39°F)244 mm (9.6 inches)88%low

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