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August Weather in Walnut Creek, United States

Last updated: June 24, 2025

In August, the average temperature in Walnut Creek, United States is a comfortable 23°C (73°F). Expect fluctuations, with minimums dipping to 10°C (50°F) and maximums soaring to 33°C (92°F). During this month, anticipate an average precipitation of 86 mm (3.4 in) spread over 13 days, contributing to an average humidity level of 76%. Enjoy the balance of warmth and moisture!

August Temperature in Walnut Creek

In August in Walnut Creek, the average temperature is 23°C (73°F). The maximum can reach 33°C (92°F) and the minimum can be as low as 10°C (50°F). This mild climate makes Walnut Creek a perfect destination for travelers seeking a comfortable getaway.

August Weather in Walnut Creek: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Walnut Creek, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Walnut Creek, August typically has an average temperature of 23°C (73°F), with highs reaching up to 33°C (92°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec303441516371757368574236
Data source: Temperature data for Walnut Creek 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 Walnut Creek

In Walnut Creek, in August, the precipitation amount is 86 mm (3.4 in) over the course of 13 days.

August Precipitation Trends in Walnut Creek

The chart displays monthly precipitation patterns in Walnut Creek, 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 Walnut Creek, August typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec89106103129123126119861051099495
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Walnut Creek

In Walnut Creek in August humidity is 76%. With an average temperature of 23°C (73°F), this humidity feels like a warm, enveloping blanket, making outdoor activities feel more intense and prompting travelers to seek shade or cool breaks more frequently.

August Average Humidity in Walnut Creek

This chart illustrates the average monthly humidity levels in Walnut Creek, 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 Walnut Creek is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%87%81%83%82%76%77%82%89%86%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Walnut Creek

In Walnut Creek in August, 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 Walnut Creek.

Maximum UV Index Levels in Walnut Creek for August

The chart shows the monthly maximum UV Index (UVI) for Walnut Creek 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 Walnut Creek typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Walnut Creek 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 Walnut Creek Compares to Other Months

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

This table compares monthly weather conditions in Walnut Creek, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)88 mm (3.5 inches)88%moderate
February Weather1°C (34°F)106 mm (4.2 inches)88%moderate
March Weather5°C (42°F)103 mm (4.1 inches)87%high
April Weather11°C (51°F)129 mm (5.1 inches)87%very high
May Weather17°C (63°F)122 mm (4.8 inches)81%very high
June Weather22°C (71°F)126 mm (5.0 inches)83%very high
July Weather24°C (76°F)118 mm (4.7 inches)82%very high
August Weather23°C (73°F)86 mm (3.4 inches)76%very high
September Weather20°C (68°F)105 mm (4.2 inches)77%very high
October Weather14°C (57°F)109 mm (4.3 inches)82%high
November Weather5°C (42°F)94 mm (3.7 inches)89%moderate
December Weather2°C (36°F)95 mm (3.8 inches)86%low

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