August Weather in Walnut Creek, United States

Last updated: June 24, 2025

In August, the average temperature in Walnut Creek, United States reaches a warm 32°C (89°F), with fluctuations that can dip to a minimum of 21°C (69°F) and soar to a maximum of 43°C (109°F). During this time, the region experiences a light precipitation amount of 14 mm (0.6 in) spread over 4 days, coupled with an average humidity of just 30%. Enjoy the warmth while staying hydrated!

August Temperature in Walnut Creek

In August in Walnut Creek, the average temperature is 32°C (89°F), with a maximum that can reach 43°C (109°F) and a minimum that can dip as low as 21°C (69°F). It's an ideal time for travelers looking to enjoy warm weather while staying hydrated and prepared for the heat.

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 32°C (89°F), with highs reaching up to 43°C (109°F) and lows dropping to around 21°C (69°F).

Data source: Temperature data for Walnut Creek generated using information from the Copernicus Climate Change Service.

August Precipitation in Walnut Creek

In Walnut Creek in August, the total precipitation amount is 14 mm (0.6 in) spread over a duration of 4 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 14 mm (0.6 inches) of precipitation spread over approximately 4 days.

Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

August Humidity in Walnut Creek

In Walnut Creek in August, humidity is 30%. With an average temperature of 32°C (89°F), this humidity feels like a warm embrace that makes traveling quite pleasant, allowing for easy exploration without the heaviness often associated with higher humidity.

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 30%, offering insight into how humid the weather typically is during this month.

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 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 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 11, which falls under the extreme exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (47°F)	28 mm (1.1 inches)	77%	moderate
February Weather	10°C (49°F)	29 mm (1.1 inches)	80%	high
March Weather	13°C (56°F)	36 mm (1.4 inches)	68%	very high
April Weather	19°C (67°F)	8 mm (0.3 inches)	58%	very high
May Weather	23°C (74°F)	7 mm (0.3 inches)	45%	extreme
June Weather	30°C (86°F)	1 mm (0.1 inches)	31%	extreme
July Weather	32°C (89°F)	32 mm (1.3 inches)	27%	extreme
August Weather	32°C (89°F)	14 mm (0.6 inches)	30%	extreme
September Weather	27°C (81°F)	15 mm (0.6 inches)	48%	very high
October Weather	19°C (67°F)	20 mm (0.8 inches)	59%	high
November Weather	14°C (57°F)	26 mm (1.0 inches)	70%	moderate
December Weather	8°C (47°F)	21 mm (0.8 inches)	77%	moderate