In September warmest sea in California is usually observed in the following locations: Fremont, San Jose, Oakland.
Table below shows the average sea water temperature for marine resorts of California in September for the last three years.
| Place name | September 2025 | September 2024 | September 2023 |
|---|---|---|---|
| Fremont | 69.7°F | 68.5°F | 68.7°F |
| San Jose | 69.5°F | 68.5°F | 68.6°F |
| Oakland | 67.1°F | 65.3°F | 66.7°F |
| Incline Village | 66.2°F | 64.6°F | 65.3°F |
| South Lake Tahoe | 65.9°F | 64.3°F | 64.9°F |
| Stateline | 65.9°F | 64.4°F | 64.9°F |
| Lake Tahoe | 65.9°F | 64.2°F | 64.9°F |
| Yosemite | 65.6°F | 65.6°F | 65.6°F |
| San Francisco | 64.8°F | 63.0°F | 64.7°F |
| Sausalito | 64.7°F | 62.5°F | 64.2°F |
| Santa Cruz | 61.3°F | 58.9°F | 61.1°F |
| Monterey | 60.7°F | 57.3°F | 60.6°F |
Charts below show average sea water temperature for California resorts with the warmest sea in September.
You can also check other months of the year to see sea temperature of California resorts at that time.
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