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October Weather in San Diego, United States

Last updated: June 24, 2025

In October, the average temperature in San Diego, United States is a pleasant 24°C (76°F). However, temperatures can vary significantly, with a minimum of 6°C (44°F) and soaring up to a maximum of 39°C (102°F). Visitors can expect 44 mm (1.7 in) of precipitation over approximately 8 days, accompanied by an average humidity level of 76%. Enjoy the diverse climate as you explore this vibrant destination!

October Temperature in San Diego

In October in San Diego, the average temperature is 24°C (76°F). Maximums can reach 39°C (102°F), while minimums can drop to as low as 6°C (44°F). Be prepared for a wide range of temperatures when traveling to San Diego during this month.

October Weather in San Diego: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in San Diego, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Diego, October typically has an average temperature of 24°C (76°F), with highs reaching up to 39°C (102°F) and lows dropping to around 6°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec586169748184858682756661
Data source: Temperature data for San Diego 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 San Diego

In San Diego in October, the total precipitation amount is 44 mm (1.7 in) over a duration of 8 days.

October Precipitation Trends in San Diego

The chart displays monthly precipitation patterns in San Diego, 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 San Diego, October typically receives around 44 mm (1.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec2724544199887952104443738
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in San Diego

In San Diego in October, humidity is 76%. With an average temperature of 24°C (76°F), this humidity feels like a warm embrace that can quickly lead to discomfort for traveling, making long walks and outdoor activities feel exhausting and sticky.

October Average Humidity in San Diego

This chart illustrates the average monthly humidity levels in San Diego, 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 San Diego is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%79%76%77%80%73%66%65%73%76%80%86%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in San Diego

In San Diego in October, 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 San Diego.

Maximum UV Index Levels in San Diego for October

The chart shows the monthly maximum UV Index (UVI) for San Diego 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 San Diego typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6810111112121211975
Data source: San Diego 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 San Diego Compares to Other Months

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

This table compares monthly weather conditions in San Diego, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather14°C (58°F)27 mm (1.1 inches)83%high
February Weather16°C (61°F)24 mm (1.0 inches)79%very high
March Weather21°C (69°F)54 mm (2.1 inches)76%very high
April Weather24°C (75°F)41 mm (1.6 inches)77%extreme
May Weather27°C (81°F)99 mm (3.9 inches)80%extreme
June Weather29°C (84°F)88 mm (3.4 inches)73%extreme
July Weather30°C (86°F)79 mm (3.1 inches)66%extreme
August Weather30°C (87°F)52 mm (2.1 inches)65%extreme
September Weather28°C (82°F)104 mm (4.1 inches)73%extreme
October Weather24°C (76°F)44 mm (1.7 inches)76%very high
November Weather19°C (66°F)37 mm (1.4 inches)80%high
December Weather16°C (61°F)38 mm (1.5 inches)86%moderate

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