August Weather in Walnut Creek, United States

Last updated: June 24, 2025

In Walnut Creek, United States, the average temperature in August is a warm 26°C (79°F). Expect a minimum of 13°C (57°F) and a maximum of 34°C (94°F), providing a diverse range for your activities. However, be prepared for precipitation averaging 159 mm (6.3 in) spread over 18 days, and enjoy the lush atmosphere with an average humidity of 80%.

August Temperature in Walnut Creek

In August in Walnut Creek, the average temperature is 26°C (79°F), with maximums reaching 34°C (94°F) and minimums dropping to as low as 13°C (57°F). It's a great time to travel, as the warm weather offers plenty of opportunities for outdoor activities and exploration.

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 26°C (79°F), with highs reaching up to 34°C (94°F) and lows dropping to around 13°C (57°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 reaches 159 mm (6.3 in) over a span of 18 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 159 mm (6.3 inches) of precipitation spread over approximately 18 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 80%. With an average temperature of 26°C (79°F), this humidity feels like a heavy blanket, making outdoor activities feel sticky and exhausting, potentially dampening the travel experience and necessitating frequent breaks to cool down and hydrate.

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 80%, 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 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.

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	7°C (45°F)	88 mm (3.5 inches)	85%	moderate
February Weather	10°C (51°F)	85 mm (3.3 inches)	82%	high
March Weather	12°C (54°F)	72 mm (2.8 inches)	81%	very high
April Weather	17°C (63°F)	104 mm (4.1 inches)	80%	very high
May Weather	22°C (71°F)	115 mm (4.5 inches)	81%	extreme
June Weather	25°C (77°F)	139 mm (5.5 inches)	81%	extreme
July Weather	27°C (81°F)	127 mm (5.0 inches)	81%	extreme
August Weather	26°C (79°F)	159 mm (6.3 inches)	80%	very high
September Weather	24°C (75°F)	148 mm (5.8 inches)	79%	very high
October Weather	19°C (67°F)	65 mm (2.5 inches)	80%	very high
November Weather	12°C (53°F)	88 mm (3.5 inches)	85%	moderate
December Weather	9°C (49°F)	107 mm (4.2 inches)	86%	moderate