October Weather in California, United States

Last updated: June 24, 2025

In October, the average temperature in California, United States is a pleasant 14°C (58°F). Temperatures can fluctuate between a chilly -1°C (31°F) and a warm 32°C (90°F). Rainfall is typical this month, with 121 mm (4.8 in) across 13 days, and the air carries a notable average humidity of 81%.

October Temperature in California

In October in California, the average temperature is 14°C (58°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop as low as -1°C (31°F). This wide temperature range makes California an ideal destination for travelers seeking both warm days and cool nights.

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

The chart illustrates October 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, October typically has an average temperature of 14°C (58°F), with highs reaching up to 32°C (90°F) and lows dropping to around -1°C (31°F).

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

October Precipitation in California

In California in October, the total precipitation amount is 121 mm (4.8 in) over the course of 13 days.

October Precipitation Trends in California

The chart displays monthly precipitation patterns in California, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In California, October typically receives around 121 mm (4.8 inches) of precipitation spread over approximately 13 days.

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

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Millimeters (mm) Inches (in)

October Humidity in California

In California in October, humidity is 81%. With an average temperature of 14°C (58°F), this humidity feels like a warm blanket wrapping around you, making outdoor adventures sticky and challenging, while also providing a lush, vibrant atmosphere perfect for exploring.

October Average Humidity in California

This chart illustrates the average monthly humidity levels in California, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in California is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in California

In California in October, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in California, you can refer to this Hourly UV Index in California.

Maximum UV Index Levels in California for October

The chart shows the monthly maximum UV Index (UVI) for California in October, 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 October, the maximum UV index in California typically reaches 6, which falls under the high exposure category.

Data source: California October 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 October 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 October’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 October’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