Half Moon Bay, California

Coastal conditions for trip planning. Informational only.

Emergency information

Call 911 for any life-threatening emergency.
U.S. Coast Guard: on a boat or in the water, use VHF Channel 16 to call for help.

ClassX.earth does not replace official emergency instructions. Follow the directions of emergency responders and lifeguards.

No active NWS alerts for this area at fetch time.

Current · Current official information · Source: National Weather Service active alerts · Last updated: Oct 20, 9:51 AM PDT

Never turn your back on the ocean; sneaker waves can reach well above the normal wash line.
Check the tide table before going out and know when the tide turns. Rocks and tide pools can be cut off by a rising tide.
Wear shoes with good traction and avoid wet, algae-covered rocks.
Go with a partner and tell someone your plan and expected return time.
Cold water is dangerous even for strong swimmers. Avoid entering the water in cold conditions.
Check warnings and the marine forecast right before you leave. Conditions can change quickly, and fog can cut visibility.