Can you swim at Half Moon Bay in December? — 13.0°C water
Cool — short dips or a shorty wetsuit
Average sea · December
13.0°C
Live water now
…
Recommended wetsuit
4/3mm fullsuit
cool
Cool. 13.0°C in December means short dips for most people. A 2 mm shorty or 3/2 mm wetsuit transforms the experience.
Monthly averages set expectations, but the specific beach today depends on wind, swell and recent weather. Check the live value at the top of this page or open the Half Moon Bay live page for full conditions.
Frequently asked questions
What is the average sea temperature at Half Moon Bay in December?
Half Moon Bay averages 13.0°C in December, based on long-run climatology for the Pacific Ocean.
Is the sea warm enough to swim at Half Moon Bay in December?
Not without thermal protection — a wetsuit is recommended at 13.0°C.
