August Weather in California, United States

Last updated: June 24, 2025

In August, the average temperature in California, United States is a pleasant 23°C (73°F), making it a perfect time to explore. Visitors can expect a minimum temperature of 12°C (54°F) and a maximum of 34°C (93°F). However, be prepared for 110 mm (4.3 in) of precipitation spread over about 15 days, contributing to an average humidity of 73%. Enjoy the vibrant atmosphere, but don't forget to keep an umbrella handy!

August Temperature in California

In August in California, the average temperature is 23°C (73°F). The maximum can reach 34°C (93°F), while the minimum can drop as low as 12°C (54°F). This mild climate makes California an ideal destination for travelers seeking pleasant weather and outdoor activities.

August Weather in California: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in California, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In California, August typically has an average temperature of 23°C (73°F), with highs reaching up to 34°C (93°F) and lows dropping to around 12°C (54°F).

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

August Precipitation in California

In California in August, the precipitation amount is 110 mm (4.3 in) over the course of 15 days.

August Precipitation Trends in California

The chart displays monthly precipitation patterns in California, 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 California, August typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 15 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 California

In California in August humidity is 73%. With an average temperature of 23°C (73°F), this humidity feels like a thick blanket wrapping around you, making travel feel stifling and sticky, as every step seems to linger in the moisture-laden air.

August Average Humidity in California

This chart illustrates the average monthly humidity levels in California, 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 California is approximately 73%, 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 California

In California 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 California.

Maximum UV Index Levels in California for August

The chart shows the monthly maximum UV Index (UVI) for California 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 California typically reaches 9, which falls under the very high exposure category.

Data source: California 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 California Compares to Other Months

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

This table compares monthly weather conditions in California, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (33°F)	87 mm (3.4 inches)	88%	moderate
February Weather	2°C (37°F)	124 mm (4.9 inches)	88%	moderate
March Weather	6°C (43°F)	117 mm (4.6 inches)	88%	high
April Weather	11°C (53°F)	129 mm (5.1 inches)	86%	very high
May Weather	17°C (63°F)	149 mm (5.9 inches)	82%	very high
June Weather	21°C (70°F)	172 mm (6.8 inches)	84%	very high
July Weather	24°C (75°F)	153 mm (6.0 inches)	82%	very high
August Weather	23°C (73°F)	110 mm (4.3 inches)	73%	very high
September Weather	20°C (68°F)	125 mm (4.9 inches)	73%	very high
October Weather	14°C (58°F)	121 mm (4.8 inches)	81%	high
November Weather	6°C (43°F)	86 mm (3.4 inches)	89%	moderate
December Weather	3°C (38°F)	116 mm (4.6 inches)	86%	moderate