San Francisco in September
Find out everything about the water temperature in San Francisco 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:
82.9 °F
Average:
84.8 °F
Maximum:
86.6 °F
Sea water temperature in San Francisco in September
In the city of San Francisco, the month of September is a great time for swimming. The minimum recorded temperature during this month was 82.9°F on September 28, 2014, with an average temperature being 84.8°F and a maximum temperature reaching 86.6°F on September 13, 2022.
| Date | 10 years average | 2024 | 2023 |
|---|---|---|---|
| Sep 1 | 84.9°F | 85.1°F | 85.3°F |
| Sep 2 | 84.9°F | 85.0°F | 84.6°F |
| Sep 3 | 85.0°F | 85.1°F | 84.6°F |
| Sep 4 | 84.8°F | 85.1°F | 84.5°F |
| Sep 5 | 84.9°F | 85.8°F | 84.8°F |
| Sep 6 | 84.9°F | 85.7°F | 84.8°F |
| Sep 7 | 85.2°F | 85.6°F | 85.6°F |
| Sep 8 | 85.0°F | 85.4°F | 85.4°F |
| Sep 9 | 85.1°F | 85.6°F | 85.1°F |
| Sep 10 | 85.2°F | 85.7°F | 85.9°F |
| Sep 11 | 85.1°F | 85.3°F | 85.2°F |
| Sep 12 | 84.9°F | 85.2°F | 85.2°F |
| Sep 13 | 85.0°F | 85.2°F | 85.1°F |
| Sep 14 | 84.8°F | 85.0°F | 84.9°F |
| Sep 15 | 84.7°F | 84.9°F | 85.2°F |
| Sep 16 | 84.6°F | 84.7°F | 85.4°F |
| Sep 17 | 84.6°F | 84.6°F | 85.2°F |
| Sep 18 | 84.8°F | 84.6°F | 85.5°F |
| Sep 19 | 84.8°F | 84.5°F | 85.9°F |
| Sep 20 | 84.8°F | 84.5°F | 85.8°F |
| Sep 21 | 84.7°F | 84.5°F | 85.6°F |
| Sep 22 | 84.9°F | 85.4°F | 85.6°F |
| Sep 23 | 84.9°F | 85.2°F | 85.5°F |
| Sep 24 | 84.8°F | 85.0°F | 84.9°F |
| Sep 25 | 84.7°F | 85.0°F | 84.9°F |
| Sep 26 | 84.7°F | 84.9°F | 85.3°F |
| Sep 27 | 84.7°F | 85.5°F | 85.4°F |
| Sep 28 | 84.6°F | 85.3°F | 85.5°F |
| Sep 29 | 84.8°F | 85.1°F | 84.9°F |
| Sep 30 | 84.7°F | 85.0°F | 85.6°F |
In San Francisco, the water temperature is comfortable for swimming all year round.
The warmest water in San Francisco was recorded on October 7, 2023, reaching a 86.8°F. While the coldest temperature occurred on December 23, 2018, dipping to 78.5°F. The average readings by season are 81.7°F in Winter, 82.8°F in Spring, 84.8°F in Summer, and 84.5°F in Autumn.
The average temperature in September is slightly warmer than August's average of 84.8°F. And in October, the temperature is expected to rise further, potentially reaching an average of 84.9°F.
Popular neighboring cities and resorts
| City | Water temperature* | Distance** |
|---|---|---|
| San Francisco |
84.6°F
|
18mi |
| San Francisco |
84.2°F
|
27mi |
| San Jose |
83.4°F
|
29mi |
| San Juan |
84.0°F
|
38mi |
| Santa Monica |
84.7°F
|
45mi |
| Madrid |
84.8°F
|
51mi |
* current water temperature in this city
** straight line distance from San Francisco