Cabo San Lucas Weather in December

December closes the year in classic Cabo dry-season style: highs of 78.7°F, under one rain day on average, humidity down to 64%, and zero recorded hurricane activity historically.

Nights cool to 65.7°F, comfortably cool for a desert evening on the marina or the Corridor.

The sea settles at 78.2°F, cooling from the fall but still swimmable, especially on the calmer Sea of Cortez side.

Humpback whale season is properly underway by December, with sightings becoming increasingly reliable as the month goes on, the main season runs into March or April, and December marks a strong start.

December is peak season and priced accordingly, especially around Christmas and New Year's, the two weeks bracketing the holidays are among the most expensive and crowded of the entire year across the Corridor's resorts.

Booking whale-watching tours, marina restaurants, and Corridor resort rooms well in advance is essential for the holiday weeks specifically; the first half of December, before the rush, is noticeably calmer for very similar weather.

Sportfishing remains excellent through December, with the year-round marlin and dorado scene continuing alongside the arriving whales for a genuinely wildlife-rich month.

Golf conditions are outstanding through December, one of the most comfortable months of the year to play, with mild temperatures and minimal wind.

Early December, before roughly the 20th, is the sweet spot: dry-season weather and the start of whale season without the holiday-week surcharge or crowds that arrive with Christmas week.

Pack for warm days and genuinely cool desert evenings, plan for holiday-week crowds if traveling Dec 20–Jan 2, and book whale tours and dinner reservations early if that's your window.