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October Weather in California, United States

Last updated: June 24, 2025

In California, United States, the average temperature in October hovers around 14°C (58°F). Daily conditions can swing from a chilly -4°C (26°F) on the low end to a warm 33°C (92°F) at the peak. Expect about 107 mm (4.2 in) of precipitation over approximately 11 days, coupled with an average humidity of 72%. Prepare for anything this month!

October Temperature in California

In October in California, the average temperature is 14°C (58°F). Maximums can reach 33°C (92°F) and minimums can be as low as -4°C (26°F). This variability makes it essential for travelers to pack layered clothing to accommodate the range of temperatures.

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 33°C (92°F) and lows dropping to around -4°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec323547546676807672584539
Data source: Temperature data for California generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

October Precipitation in California

In California in October, the precipitation amount is 107 mm (4.2 in) spread over a period of 11 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 107 mm (4.2 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec6860114124176113115106611075638
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in California

In California in October, humidity is 72%. With an average temperature of 14°C (58°F), this humidity feels like a damp blanket wrapping around you, making walking and exploring slightly uncomfortable and requiring frequent breaks for hydration.

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 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%78%75%77%82%83%81%78%72%72%84%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109743
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.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)68 mm (2.7 inches)80%moderate
February Weather1°C (35°F)60 mm (2.4 inches)78%moderate
March Weather8°C (47°F)114 mm (4.5 inches)75%high
April Weather12°C (55°F)124 mm (4.9 inches)77%very high
May Weather19°C (67°F)175 mm (6.9 inches)82%very high
June Weather25°C (77°F)113 mm (4.4 inches)83%extreme
July Weather26°C (80°F)115 mm (4.5 inches)81%extreme
August Weather25°C (77°F)106 mm (4.2 inches)78%very high
September Weather22°C (73°F)61 mm (2.4 inches)72%very high
October Weather14°C (58°F)107 mm (4.2 inches)72%high
November Weather7°C (45°F)56 mm (2.2 inches)84%moderate
December Weather4°C (39°F)38 mm (1.5 inches)86%moderate

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