The highest day temperature in September 2023 was 98°F. The lowest night temperature was 80°F. The average values for day and night temperatures during September were 94.3°F и 82.2°F respectivly.

The average sea surface temperature in September 2023 for San Diego was 90.1°F. The maximum and minimum values were 89.2°F and 91.4°F respectively.

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

Precipitation total in September for San Diego is 4.6 in. It makes september one of the most rainy months of the year.

The average wind speed in September is 5.9 mph. It makes September one of the most windless months 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 September is 4.5 hours.