Sf Bay A San Mateo Bridge near Foster City, California water temperature

Sf Bay A San Mateo Bridge near Foster City, California · Sea/Coast

The current water temperature at Sf Bay A San Mateo Bridge near Foster City is 20.3 °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.

20.3 °C

Measured: August 31, 2026 · continuously updated

💧 Water 20.3° · ☀️ Air 18.0° · high today 19.7°

Temperature trend of recent weeks

Sf Bay A San Mateo Bridge near Foster City, California — Photo: Tobias from Hamburg, Germany · CC BY-SA 2.0 · Wikimedia Commons

Measurement series & statistics

This measurement series includes 441 data points since July 8, 2026.

Lowest recorded value: 20.0 °C on July 12, 2026 · highest value: 22.9 °C on August 7, 2026.

Nearby waters

San Mateo C below Lo Crystal Sp Reservoir near San Mateo, California · 11.3 km away14.5 °C South San Francisco Bay at Dumbarton Bridge, California · 14.5 km away20.9 °C Pilarcitos C below Stone Dam near Hillsborough, California · 14.7 km away15.2 °C Pacific, Alameda · 21.3 km away19.5 °C Pacific, Alameda, CA · 21.3 km away19.5 °C

Frequently asked questions

Can you swim at Sf Bay A San Mateo Bridge near Foster City right now?
The current water temperature is 20.3 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Sf Bay A San Mateo Bridge near Foster City?
Currently 20.3 °C (updated continuously).

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