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San Diego in September

Find out everything about the water temperature in San Diego in September. Average, minimum and maximum recorded temperatures as well as daily temperature in September for the last two years. Compare the current month's sea temperature data with other months of the year.
Water temperature in September
Minimum:

63.6 °F

Average:

69.4 °F

Maximum:

75.2 °F

Sea water temperature in San Diego in September

In the city of San Diego, the month of September is somewhat comfortable for swimming. The minimum recorded temperature during this month was 63.6°F on September 20, 2021, with an average temperature being 69.4°F and a maximum temperature reaching 75.2°F on September 14, 2015.

While some may find it enjoyable for a brief swim, others might consider it a bit too cold for extended periods in the water. In September, the sea temperature remains relatively stable. The average temperature stays close to 69.4°F throughout the month, with minimal changes.
Date 10 years average 2024 2023
Sep 1 69.9°F 70.4°F 66.2°F
Sep 2 69.9°F 69.5°F 67.0°F
Sep 3 70.2°F 70.2°F 68.3°F
Sep 4 70.7°F 70.0°F 69.4°F
Sep 5 70.7°F 70.8°F 69.4°F
Sep 6 70.4°F 70.3°F 68.8°F
Sep 7 70.6°F 70.8°F 69.6°F
Sep 8 70.6°F 71.6°F 70.1°F
Sep 9 70.6°F 71.3°F 69.9°F
Sep 10 70.6°F 71.7°F 69.8°F
Sep 11 70.6°F 71.9°F 70.0°F
Sep 12 70.3°F 71.3°F 69.7°F
Sep 13 70.0°F 70.9°F 68.8°F
Sep 14 69.7°F 71.1°F 68.3°F
Sep 15 69.6°F 70.8°F 68.2°F
Sep 16 69.6°F 70.2°F 68.1°F
Sep 17 69.5°F 69.4°F 68.0°F
Sep 18 69.2°F 68.7°F 67.8°F
Sep 19 68.9°F 68.9°F 67.3°F
Sep 20 68.6°F 68.4°F 66.9°F
Sep 21 68.7°F 68.1°F 66.5°F
Sep 22 68.8°F 68.1°F 66.2°F
Sep 23 68.6°F 67.6°F 66.1°F
Sep 24 68.3°F 68.0°F 64.8°F
Sep 25 68.1°F 67.9°F 64.2°F
Sep 26 67.9°F 66.8°F 63.8°F
Sep 27 68.1°F 65.7°F 64.0°F
Sep 28 67.9°F 65.4°F 64.2°F
Sep 29 68.0°F 65.2°F 65.9°F
Sep 30 68.1°F 64.7°F 66.9°F

Sea water temperature in San Diego by month

In an average year, San Diego offers no days when the water temperature is warm enough to swim comfortably. The warmest water in San Diego was recorded on August 7, 2018, reaching a 75.8°F. While the coldest temperature occurred on February 25, 2023, dipping to 55.9°F. The average readings by season are 60.1°F in Winter, 61.8°F in Spring, 68.6°F in Summer, and 66.8°F in Autumn. September's average temperature is a slight drop from August's average of 70.4°F. In October, the temperature is expected to decrease further, potentially averaging around 67.1°F.

Popular neighboring cities and resorts

City Water temperature* Distance**
Tijuana 62.7°F 17mi
Oceanside 64.9°F 35mi
Laguna Beach 62.6°F 67mi

* current water temperature in this city

** straight line distance from San Diego