Can you swim at Half Moon Bay Beach in September? — 27.0°C water
Yes — ideal swimming weather
Average sea · September
27.0°C
Live water now
…
Recommended wetsuit
No wetsuit
tropical
Yes. Half Moon Bay Beach averages 27.0°C in September — bath-warm by European standards and comfortable for all-day swimming, snorkelling and families.
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 Beach live page for full conditions.
Best months to swim
May · June · July · August · September · October · November
Frequently asked questions
What is the average sea temperature at Half Moon Bay Beach in September?
Half Moon Bay Beach averages 27.0°C in September, based on long-run climatology for the Pacific Ocean.
Is the sea warm enough to swim at Half Moon Bay Beach in September?
Yes, most swimmers find 27.0°C comfortable for unrestricted swimming.
Do I need a wetsuit at Half Moon Bay Beach in September?
