Higher-than-normal tides could flood low-lying coastal areas around the San Francisco Bay Area, while dangerous beach conditions and a moderate heat risk are expected to persist.
Forecasters warned that minor coastal flooding could affect roads, parks and parking lots in bayshore communities from the North Bay to the South Bay, with isolated road closures.
Beachgoers are being urged to use caution as a long-period southerly swell increases the risk of sneaker waves and strong rip currents.
The flooding threat is being driven by unusually high tides enhanced by wind, ocean swell and thermal expansion.
According to the weather service, high tides at the San Francisco tidal gauge are expected to reach 1.8 feet above normal.