Half Moon Bay Beach Water Temperature
Sea-surface temperature at Half Moon Bay Beach, California · times in PDT
Updated 1:00 AM PDT
How it compares today
Water temperature through the year
Monthly normals computed from 2023–2025 daily sea-surface temperature history.
Nearby water right now
7-day outlook
| Day | Air high / low | Max UV | Rain |
|---|---|---|---|
| Tue, Oct 13 | 74° / 50° | 5 | 0% |
| Wed, Oct 14 | 71° / 51° | 5 | 0% |
| Thu, Oct 15 | 85° / 56° | 5 | 0% |
| Fri, Oct 16 | 90° / 62° | 5 | 0% |
| Sat, Oct 17 | 86° / 57° | 5 | 0% |
| Sun, Oct 18 | 62° / 55° | 5 | 0% |
| Mon, Oct 19 | 63° / 53° | 4 | 20% |
Sea-surface temperature and wave data from the Open-Meteo marine model; weather from Open-Meteo.
Is Half Moon Bay Beach warm enough to swim?
At 61°F, the water at Half Moon Bay Beach is chilly — wetsuit recommended. Most swimmers are comfortable without a wetsuit above 72°F; below 62°F, cold-water shock becomes a real risk for unprotected swimmers.
That is 1° above the October average of 60°F here.
The water here never averages above 70°F — even in September, the warmest month, it sits around 61°F. Most people wear a wetsuit.
Frequently asked questions
How warm is the water at Half Moon Bay Beach right now?
The sea-surface temperature is about 61°F. That is 1° above the October average of 60°F here.
When is the water warm enough to swim at Half Moon Bay Beach?
The water here never averages above 70°F — even in September, the warmest month, it sits around 61°F. Most people wear a wetsuit.
What is the warmest the water gets at Half Moon Bay Beach?
Around 61°F in September, based on 2023–2025 records. The coolest month is March at roughly 54°F.