It depends. Seal Beach sits around 17.0°C in May; confident swimmers will be fine, casual bathers may prefer short sessions.
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 Seal Beach live page for full conditions.
Best months to swim
August
Frequently asked questions
What is the average sea temperature at Seal Beach in May?
Seal Beach averages 17.0°C in May, based on long-run climatology for the Pacific Ocean.
Is the sea warm enough to swim at Seal Beach in May?
It is swimmable but fresh; confident swimmers will be fine without a wetsuit.
Do I need a wetsuit at Seal Beach in May?
A 2 mm shorty is comfortable for sessions over 30 minutes.
