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: Fri, Jun 12, 2026 at 12:50:26 pm PDT

Watches, Warnings & Advisories

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National Weather Service San Francisco Bay Area, CA

Extreme Heat Warning

Gale Warning

Heat Advisory

Coastal Flood Advisory

Small Craft Advisory

Beach Hazards Statement

Heat Advisory

Cold Rivers

A Heat Advisory has been issued for Lake & Interior Mendocino Counties Today & Friday. High temperatures in the triple digits are possible in many valley locations. Above normal temperatures are likely to continue into early next week.

Weather may be getting hotter, but rivers are still cold. Don't let rivers fool you this weekend. Cold water is dangerous for swimming. It can cause you to lose control of your breathing and also the muscles you need to swim. Check the water temps to see if it's too cold for swimming. Enjoy your river visit by wearing a life jacket or plan on not swimming.