December through March is when this stretch of Baja California Sur is at its most comfortable and among the best times to visit. The season brings warm days, cool desert nights, dry skies, and winter whales. These months also fall within Cabo's high season.
What Winter Weather Actually Feels Like
Winter weather stays dry and sunny, with comfortable warmth. Daytime highs sit in the mid-70s to low 80s°F (roughly 24–27°C) across December through March, with cooler nights that dip into the low 60s°F.
January is the coolest month, though daytime highs almost always surpass 70°F (21°C) and nighttime lows rarely fall below 50°F (10°C). By March, temperatures begin reaching into the 80s°F.
Rain is rare. Winter is the dry season here, with total rainfall across the entire high season under 1.5 inches. The chance of rain on any given day hovers around 2%.
Sunshine follows suit. Winter days average seven to eight hours of it. The southern Baja Peninsula sits too far south to catch the North Pacific storms that reach farther north, so the region settles into a long, dry, bright spell.
Occasional cold fronts can bring cooler nights, but daytime temperatures typically stay above 68°F even during those events. Pack a sweater for evenings and you're covered.
Is Winter a Good Time to Go
Winter brings comfortable temperatures, calm seas, clear skies, and marine life. You can also plan around winter whale encounters you can't see any other time of year.
The calm winter seas make swimming and snorkeling easy, and divers also benefit from the steadier water. The desert cools enough for land adventures to feel pleasant. And the whales arrive.
Conditions vary by season, and Cabo rewards visitors year-round. But if your window is December through March, you've picked a stretch when the conditions and the wildlife line up in a way that's specific to these months.
Can You Swim in Winter
You can. All four winter months are swimmable, with winter water temperatures cooling gradually from December to March.
December is the warmest, with an average water temperature around 77°F that's explicitly described as suitable for comfortable swimming. By February and March, the water settles into the low 70s°F, cooler but still comfortable for most swimmers. The swimming season here runs twelve months a year, with water temperatures that don't drop below 68°F.
If you plan to spend extended time snorkeling rather than quick dips, December is the most reliably warm month. For longer time in the water later in winter, a rash guard or wetsuit keeps things comfortable.
Whale Watching, the Season's Signature
Winter whale watching gives Cabo a seasonal draw no other part of the year can match. Winter is the core whale watching window in Cabo, and local whale migration activity continues into spring.
Humpback whales are a winter focus. They migrate to Cabo's warmer waters to mate and give birth.
Gray whales travel one of the longest migrations of any mammal, roughly 12,000 miles roundtrip. They reach the sheltered Baja lagoons on the Pacific Ocean side. Mid-February to late March is especially strong timing in those lagoons.
The Sea of Cortez, which Jacques Cousteau called the "World's Aquarium," also draws seasonal marine life as winter progresses. Whale-season sightings and dolphins are part of the mix. orcas are more often noted in spring, and mobula ray aggregations arrive in late spring.
Other Ways to Spend Winter Days
Whales are the headline, but they share the calendar with plenty else.
- Beaches: Medano Beach sits within walking distance of the marina, while Lover's Beach near El Arco is reachable by boat. Calm winter seas make both an easy choice for a slow day.
- Snorkeling: Protected bays like Chileno Bay offer sandy entry and calm water. Near Land's End and Pelican Rock, snorkelers swim alongside sea lions and dozens of fish species. Water runs cooler in winter, so a rash guard helps.
- Boat trips: Nearly every kind of water excursion runs through winter, including sailing and snorkeling combos and sunset cruises past the Arch. Wildlife sightings of dolphins, rays, whales, and other marine life are part of the appeal.
- Whale sharks in La Paz: These gentle giants feed in La Paz Bay from November through roughly March, reachable as a full-day trip from Cabo.
What to Pack
Pack swimwear and sun protection for the day, plus light layers for the evening. Leave the heavy winter clothing at home.
For daytime, bring two or three swimsuits, lightweight cotton or linen tops, shorts, and a rash guard for the water. A wide-brimmed hat and sunglasses handle the strong sun, and sun-protective clothing is your best defense during long days outdoors.
Evening temperatures cool into the low 60s°F, so light winter layers should include a light sweater or cardigan, long pants or jeans, and a windbreaker or hoodie. You won't need rain gear.
Round it out with water shoes for rocky boat exits, closed-toe shoes for adventure tours, and a reusable water bottle. For dining out, resort casual works well: sundresses or linen pants with simple sandals.
Crowds and Pricing
Winter is peak season, and for good reason. The Cabo weather and whale watching draw steady arrivals from December through mid-April.
The winter holidays are the peak stretch of the year, with premium demand for resorts and tours. Early December is usually calmer than the holiday weeks.
February lands in a sweet spot for active whale watching and pleasant weather. Book early for the busiest windows and things stay smooth.
Winter Tours Worth Building Your Trip Around
These three tours fit winter's water and coastal conditions.
- Cabo Whale Watching: A whale watching expedition on custom rigid inflatable boats to encounter humpback, blue, gray, and minke whales in their natural habitat. You'll listen to whale songs through state-of-the-art hydrophones, take in views of the Cabo San Lucas Arch and Lover's Beach, and pass the sea lion colony. Marine specialist insights are included.
- La Paz Whale Shark Tour: An all-inclusive whale shark tour to swim alongside whale sharks, the largest fish in the ocean, in their natural habitat near La Paz. Professional bilingual guides share insight on whale shark behavior and conservation, with the chance to spot dolphins and rays. Includes round-trip transportation, snorkeling gear and wetsuits, and a Baja-style lunch.
- Tierra Sagrada All Inclusive Park Pass: A family-friendly Tierra Sagrada pass that blends relaxation with light adventure, away from the crowds. Families can split time between the mini zipline, petting zoo, treasure hunt, beach soccer, and beach DJ. Adults can add mezcal and Mexican wine tastings plus cooking lessons. Beach club access, a Baja-style buffet, and round-trip transportation round it out.
Winter in Cabo brings warm sun and seasonal whale watching, with calmer water for boat days. December through March gives you dry weather and cooler evenings, with winter marine life to plan around.
