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:
85.0 °F
Average:
87.0 °F
Maximum:
89.4 °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 85.0°F on September 5, 2014, with an average temperature being 87.0°F and a maximum temperature reaching 89.4°F on September 26, 2023.
| Date | 10 years average | 2024 | 2023 |
|---|---|---|---|
| Sep 1 | 87.0°F | 86.5°F | 87.3°F |
| Sep 2 | 87.0°F | 86.4°F | 87.9°F |
| Sep 3 | 86.8°F | 86.2°F | 87.8°F |
| Sep 4 | 86.8°F | 86.1°F | 87.9°F |
| Sep 5 | 86.7°F | 87.3°F | 87.5°F |
| Sep 6 | 86.6°F | 87.7°F | 87.3°F |
| Sep 7 | 86.5°F | 88.3°F | 87.4°F |
| Sep 8 | 86.3°F | 88.1°F | 87.3°F |
| Sep 9 | 86.6°F | 87.9°F | 87.9°F |
| Sep 10 | 86.7°F | 87.7°F | 87.7°F |
| Sep 11 | 86.8°F | 87.5°F | 87.2°F |
| Sep 12 | 86.8°F | 87.4°F | 87.5°F |
| Sep 13 | 86.8°F | 87.2°F | 87.5°F |
| Sep 14 | 86.9°F | 87.7°F | 87.8°F |
| Sep 15 | 87.0°F | 87.6°F | 88.1°F |
| Sep 16 | 87.1°F | 87.4°F | 88.5°F |
| Sep 17 | 87.1°F | 88.0°F | 88.5°F |
| Sep 18 | 87.1°F | 88.5°F | 88.2°F |
| Sep 19 | 87.2°F | 87.9°F | 88.1°F |
| Sep 20 | 87.2°F | 88.2°F | 87.9°F |
| Sep 21 | 87.2°F | 88.7°F | 88.0°F |
| Sep 22 | 87.2°F | 88.4°F | 87.9°F |
| Sep 23 | 87.3°F | 88.6°F | 88.4°F |
| Sep 24 | 87.3°F | 88.3°F | 88.3°F |
| Sep 25 | 87.1°F | 88.2°F | 87.9°F |
| Sep 26 | 87.2°F | 87.6°F | 89.4°F |
| Sep 27 | 87.2°F | 88.5°F | 88.5°F |
| Sep 28 | 87.0°F | 89.2°F | 88.2°F |
| Sep 29 | 87.2°F | 88.9°F | 89.1°F |
| Sep 30 | 87.2°F | 88.6°F | 89.2°F |
In San Francisco, the water temperature is comfortable for swimming all year round.
The warmest water in San Francisco was recorded on July 31, 2023, reaching a 89.6°F. While the coldest temperature occurred on January 14, 2021, dipping to 70.5°F. The average readings by season are 78.1°F in Winter, 78.4°F in Spring, 85.8°F in Summer, and 85.8°F in Autumn.
September's average temperature is a slight drop from August's average of 87.3°F. In October, the temperature is expected to decrease further, potentially averaging around 86.6°F.