The highest day temperature in October 2025 was 91°F. The lowest night temperature was 77°F. The average values for day and night temperatures during October were 85.7°F и 79.2°F respectivly.

The average sea surface temperature in October 2025 for San Diego was 88.2°F. The maximum and minimum values were 87.6°F and 89.2°F respectively.

Most of the days in October are gloomy but you can also expect sunny days.

Precipitation total in October for San Diego is 5.2 in. It makes october one of the most rainy months of the year.

The average wind speed in October is 5.4 mph. It makes October the most windless month of the year for San Diego.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for San Diego in October is 4.1 hours.