South San Francisco Bay at Dumbarton Bridge, California water temperature

South San Francisco Bay at Dumbarton Bridge, California · Sea/Coast

The current water temperature at South San Francisco Bay at Dumbarton Bridge is 20.9 °C (as of August 31, 2026, source: USGS).

The sea lags the air by weeks: the warmest water often arrives after the warmest days. Measured buoy values show this honestly.

20.9 °C

Measured: August 31, 2026 · continuously updated

💧 Water 20.9° · ☀️ Air 19.6° · high today 21.5°

Temperature trend of recent weeks

South San Francisco Bay at Dumbarton Bridge, California — Photo: Pedro Xing · CC0 · Wikimedia Commons

Measurement series & statistics

This measurement series includes 437 data points since July 8, 2026.

Lowest recorded value: 16.2 °C on July 16, 2026 · highest value: 23.5 °C on August 14, 2026.

Nearby waters

Salt Pond A4 near Alviso, California · 14.5 km away24.4 °C Sf Bay A San Mateo Bridge near Foster City, California · 14.5 km away20.3 °C Alameda C near Niles, California · 16.8 km away21.0 °C Coyote C above HWY 237 A Milpitas, California · 19.3 km away20.6 °C San Mateo C below Lo Crystal Sp Reservoir near San Mateo, California · 21.2 km away14.5 °C

Frequently asked questions

Can you swim at South San Francisco Bay at Dumbarton Bridge right now?
The current water temperature is 20.9 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at South San Francisco Bay at Dumbarton Bridge?
Currently 20.9 °C (updated continuously).

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