October weather forecast and climate
San Diego, CA

The view of Coronado Island in San Diego, California, from across a water body on a sidewalk, with a row of palm trees
The view of Coronado Island in San Diego, California, from across a water body on a sidewalk, with a row of palm trees
October lies during the autumn season of San Diego, with mostly dry and sunny weather. The average temperatures are in the 63°F (17.2°C) to 71°F (21.7°C) range, which makes the conditions pleasant.
The daylight drops to 11 hours and the daily sunlight to 7.9 hours. The skies tend to be cloudy in the morning and clear by afternoon. The end of the summer brings down the average humidity to 69%. An odd spell of rain is due during the month, but the rain rarely goes beyond it. October may surprise with a thunderstorm in San Diego!

What is the temperature in October in San Diego?

The average high-temperature, in October, is 72.9°F (22.7°C), while the average low-temperature is 60.6°F (15.9°C).

What is the average humidity in October in San Diego?

In October, the average relative humidity in San Diego, California, is 69.4%.

How many days does it rain in October in San Diego?

In San Diego, in October, it is raining for 2.8 days, with typically 0.3" (8mm) of accumulated precipitation.

How cold is the water in October in San Diego?

In San Diego, the average seawater temperature in October is 65.1°F (18.4°C). For swimming, a surface water temperature of 65.1°F (18.4°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

How many hours of daylight does San Diego have in October?

In October, the average length of the day in San Diego is 11.3h.

How many hours of sunshine does San Diego have in October?

The average sunshine in October is 7.9h.

What is the UV index intensity in October in San Diego?

The average UV index in October is 6.
Average temperature in October - San Diego, CA
  • Average high temperature in October: 72.8°F

The warmest month (with the highest average high temperature) is August (76.4°F).
The month with the lowest average high temperature is December (64.7°F).

  • Average low temperature in October: 60.6°F

The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is December (48.4°F).

Average humidity in October - San Diego, CA
  • Average humidity in October: 69.4%

The month with the highest relative humidity is July (74.6%).
The month with the lowest relative humidity is January (63.1%).

Average rainfall in October - San Diego, CA
  • Average rainfall in October: 0.3"

The wettest month (with the highest rainfall) is January (2.1").
The driest month (with the lowest rainfall) is July (0").

Average rainfall days in October - San Diego, CA
  • Average rainfall days in October: 2.8 days

The month with the highest number of rainy days is February (7.1 days).
The month with the lowest number of rainy days is August (0.4 days).

Average sea temperature in October - San Diego, CA
  • Average sea temperature in October: 65.1°F

The best month for swimming (with the highest average sea temperature) is August (67.9°F).
The coldest month (with the lowest average sea temperature) is February (58.7°F).

Average daylight in October / Average sunshine in October - San Diego, CA
  • Average daylight in October: 11.3h

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10h).

  • Average sunshine in October: 7.9h

The month with most sunshine is July (Average sunshine: 9.8h).
The month with least sunshine is December (Average sunshine: 7.5h).

Average UV index in October - San Diego, CA
  • Average UV index in October: 6

Months with the highest UV index are June, July and August (UV index 10).
Months with the lowest UV index are January and December (UV index 3).

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