Can you swim at Half Moon Bay in September? — 24.0°C water
Yes — ideal swimming weather
Average sea · September
24.0°C
Live water now
…
Recommended wetsuit
No wetsuit
hot
Yes. Half Moon Bay averages 24.0°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 live page for full conditions.
Best months to swim
June · July · August · September
Frequently asked questions
What is the average sea temperature at Half Moon Bay in September?
Half Moon Bay averages 24.0°C in September, based on long-run climatology for the Atlantic Ocean.
Is the sea warm enough to swim at Half Moon Bay in September?
Yes, most swimmers find 24.0°C comfortable for unrestricted swimming.
Do I need a wetsuit at Half Moon Bay in September?
