Baja California

The sea in Baja California peaks in August, when the water averages around 28°C.

The main swimming season runs from April – November, when surface temperatures stay comfortable for extended sessions.

On average, 8 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.

Shoulder months like March and December are noticeably cooler but often quieter, with fewer crowds and steadier weather.

The coldest month is typically January at around 18°C, when cold-water swimmers dominate the coast.

Long-term climatology for Baja California shows an annual mean sea temperature of 23°C, ranging from 18°C in winter to 28°C at the summer peak.

The seasonal swing is roughly 10°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.

Recent decades have trended slightly warmer at Baja California, in line with regional sea-surface temperature records for the wider basin.

Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.