October Weather in California, United States

Last updated: June 24, 2025

In California, United States, the average temperature in October hovers around 18°C (65°F), creating a pleasant atmosphere for outdoor activities. Temperatures can dip to a minimum of 7°C (44°F) and rise to a maximum of 31°C (89°F), offering a diverse range of experiences. Keep in mind that precipitation averages around 133 mm (5.2 in) over 9 days, so don’t forget your umbrella! With an average humidity of 81%, be prepared for a slightly muggy feel, especially during the warmer days.

October Temperature in California

In October in California, the average temperature is 18°C (65°F). The maximum can reach 31°C (89°F), while the minimum can drop to as low as 7°C (44°F). This moderate climate makes California an ideal destination for travelers seeking a comfortable and enjoyable experience.

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 18°C (65°F), with highs reaching up to 31°C (89°F) and lows dropping to around 7°C (44°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 precipitation amount is 133 mm (5.2 in) spread over a duration of 9 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 133 mm (5.2 inches) of precipitation spread over approximately 9 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 18°C (65°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier and the air thick and sultry—a challenging environment for traveling.

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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the 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 7, 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	4°C (39°F)	75 mm (3.0 inches)	84%	moderate
February Weather	5°C (42°F)	118 mm (4.7 inches)	83%	moderate
March Weather	8°C (47°F)	93 mm (3.7 inches)	83%	high
April Weather	14°C (57°F)	97 mm (3.8 inches)	81%	very high
May Weather	19°C (66°F)	119 mm (4.7 inches)	78%	very high
June Weather	24°C (75°F)	98 mm (3.8 inches)	79%	very high
July Weather	27°C (81°F)	132 mm (5.2 inches)	74%	very high
August Weather	26°C (79°F)	152 mm (6.0 inches)	72%	very high
September Weather	23°C (74°F)	110 mm (4.3 inches)	75%	very high
October Weather	18°C (65°F)	133 mm (5.2 inches)	81%	high
November Weather	10°C (51°F)	94 mm (3.7 inches)	85%	moderate
December Weather	6°C (44°F)	107 mm (4.2 inches)	84%	moderate