August Weather in Walnut Creek, United States

Last updated: June 24, 2025

In August, the average temperature in Walnut Creek, United States is a pleasant 20°C (69°F). The temperature can swing from a minimum of 12°C (54°F) to a scorching 41°C (106°F). Rainfall is virtually nonexistent, with 0 mm (0.0 in) of precipitation over 0 days, and the average humidity sits at a comfortable 54%. Enjoy the delightful climate!

August Temperature in Walnut Creek

In August in Walnut Creek, the average temperature is 20°C (69°F). Maximums can reach 41°C (106°F), and minimums can drop as low as 12°C (54°F). It's a great time for travelers to enjoy a mix of warm days and cooler evenings, perfect for exploring the area.

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 20°C (69°F), with highs reaching up to 41°C (106°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec505255596368686968645650
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 0 mm (0.0 in) during 0 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 0 mm (0.0 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec99897231161001233775
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 54%. With an average temperature of 20°C (69°F), this humidity feels like a refreshing embrace, making it comfortable for traveling while allowing for pleasant outdoor activities.

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 54%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
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 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 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109643
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 Weather10°C (50°F)99 mm (3.9 inches)82%moderate
February Weather11°C (53°F)89 mm (3.5 inches)84%moderate
March Weather13°C (55°F)72 mm (2.8 inches)82%very high
April Weather15°C (59°F)31 mm (1.2 inches)78%very high
May Weather17°C (63°F)16 mm (0.6 inches)71%very high
June Weather20°C (68°F)1 mm (0.1 inches)64%extreme
July Weather20°C (68°F)0 mm (0.0 inches)58%extreme
August Weather20°C (69°F)0 mm (0.0 inches)54%very high
September Weather20°C (69°F)1 mm (0.0 inches)55%very high
October Weather18°C (64°F)23 mm (0.9 inches)62%high
November Weather13°C (56°F)37 mm (1.5 inches)78%moderate
December Weather10°C (50°F)75 mm (2.9 inches)80%moderate

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