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May Weather in Boulder City, United States

Last updated: June 24, 2025

In May, the average temperature in Boulder City, United States is a comfortable 26°C (78°F), making it an inviting destination. However, temperatures can vary significantly, with a minimum of 11°C (52°F) and soaring to a maximum of 42°C (108°F). Expect some light rain, with average precipitation at just 6 mm (0.2 in) over 1 day. Enjoy a moderately dry climate with an average humidity of 45%!

May Temperature in Boulder City

In May, Boulder City experiences an average temperature of 26°C (78°F). The maximum can reach as high as 42°C (108°F), while the minimum can drop to 11°C (52°F). Be prepared for a wide range of temperatures when planning your travel in this month.

May Weather in Boulder City: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Boulder City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Boulder City, May typically has an average temperature of 26°C (78°F), with highs reaching up to 42°C (108°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec495361717891959486706049
Data source: Temperature data for Boulder City 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 Boulder City

In Boulder City in May, the precipitation amount is 6 mm (0.2 in) over the course of 1 day.

May Precipitation Trends in Boulder City

The chart displays monthly precipitation patterns in Boulder City, 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 Boulder City, May typically receives around 6 mm (0.2 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec2122205611811581916
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Boulder City

In Boulder City in May, humidity is 45%. With an average temperature of 26°C (78°F), this humidity feels like a warm embrace, making it pleasant for traveling while still allowing for comfortable outdoor adventures.

May Average Humidity in Boulder City

This chart illustrates the average monthly humidity levels in Boulder City, 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 Boulder City is approximately 45%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%80%68%58%45%31%27%30%48%60%70%77%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Boulder City

In Boulder City 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 Boulder City.

Maximum UV Index Levels in Boulder City for May

The chart shows the monthly maximum UV Index (UVI) for Boulder City 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 Boulder City typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101112121110753
Data source: Boulder City 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 Boulder City Compares to Other Months

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

This table compares monthly weather conditions in Boulder City, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)21 mm (0.8 inches)77%moderate
February Weather12°C (53°F)21 mm (0.8 inches)80%high
March Weather16°C (61°F)20 mm (0.8 inches)68%very high
April Weather22°C (71°F)5 mm (0.2 inches)58%very high
May Weather26°C (78°F)6 mm (0.2 inches)45%extreme
June Weather33°C (91°F)1 mm (0.0 inches)31%extreme
July Weather35°C (96°F)17 mm (0.7 inches)27%extreme
August Weather35°C (95°F)11 mm (0.4 inches)30%extreme
September Weather30°C (86°F)5 mm (0.2 inches)48%very high
October Weather21°C (71°F)8 mm (0.3 inches)59%high
November Weather15°C (60°F)19 mm (0.7 inches)70%moderate
December Weather10°C (50°F)15 mm (0.6 inches)77%moderate

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