Check Water Temperatures Before Your River Visit

Water temperatures below 70 degrees causes you to lose breathing & muscle control which can lead to drowning. The colder the water the more extreme the impacts. Enjoy the river by staying dry when water is cold. Read More >

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Last Map Update: Sun, May 24, 2026 at 10:14:18 pm PDT

Watches, Warnings & Advisories

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National Weather Service San Francisco Bay Area, CA

Red Flag Warning

Small Craft Advisory

Lake Wind Advisory

Gale Watch

Cold Rivers

Weather may be warming up but river temperatures remain cold this time year. Cold water can impact your breathing and hinder your ability to swim. Most rivers are 60 degrees or colder, which makes swimming dangerous. Stay safe during your river visit by staying dry.