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August Weather in Boulder City, United States

Last updated: June 24, 2025

In Boulder City, United States, the average temperature in August reaches a sizzling 35°C (95°F), with a comfortable minimum of 23°C (75°F) and an occasionally scorching maximum of 45°C (114°F). Despite the heat, precipitation is relatively low, with only 11 mm (0.4 in) expected over 3 days, and the average humidity sits at a manageable 30%.

August Temperature in Boulder City

In August in Boulder City, the average temperature is 35°C (95°F), with maximums reaching up to 45°C (114°F) and minimums dropping to as low as 23°C (75°F). Be prepared for hot weather if you're planning to travel during this time!

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

The chart illustrates August 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, August typically has an average temperature of 35°C (95°F), with highs reaching up to 45°C (114°F) and lows dropping to around 23°C (75°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.

August Precipitation in Boulder City

In Boulder City in August, the precipitation amount is 11 mm (0.4 in) over the course of 3 days.

August Precipitation Trends in Boulder City

The chart displays monthly precipitation patterns in Boulder City, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Boulder City, August typically receives around 11 mm (0.4 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec2122205611811581916
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Boulder City

In Boulder City in August humidity is 30%. With an average temperature of 35°C (95°F), this humidity feels like an intense, warm embrace, making traveling slightly uncomfortable as the heat clings to your skin, leaving you yearning for refreshing breaks in the shade and plenty of hydration.

August Average Humidity in Boulder City

This chart illustrates the average monthly humidity levels in Boulder City, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Boulder City is approximately 30%, 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 August generated using information from the Copernicus Climate Change Service.

August UV Index in Boulder City

In Boulder City in August, 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 August

The chart shows the monthly maximum UV Index (UVI) for Boulder City in August, 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 August, the maximum UV index in Boulder City typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101112121110753
Data source: Boulder City August 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 August 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 August’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 August’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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