What December Weather Actually Feels Like
December sits in Los Cabos' dry season, and the numbers are steady: daytime highs around 26-28°C on the corridor between San José del Cabo and Cabo San Lucas, nights dropping to about 15-17°C, and rainfall close to nil. The water is cooler than the air, roughly 22-23°C on the Pacific side and a touch warmer in the Sea of Cortés, so most people swim in the morning and early afternoon. The wind is the variable to plan around: the Costa Azul and Palmilla stretches catch more of it, which is why surfers and kiteboarders favour them, while sheltered coves near Cabo San Lucas stay calmer.
Packing is simple: light layers for evenings, a windproof jacket if you plan to be on a boat, reef-safe sunscreen, and shoes you can walk in on cobblestones. December is also the start of the busiest stretch, so restaurants in Cabo San Lucas Marina and on San José's Plaza Mijares fill earlier than in November. Book dinner reservations a day ahead, and expect the corridor's main road, the Carretera Transpeninsular, to be slower between 17:00 and 19:00 when day-trippers return from the beaches.
Whale Season Begins in Earnest
Humpbacks arrive in Baja California Sur waters from December, with the first sightings usually reported off Cabo San Lucas in the second half of the month. Boats leave from the marina in Cabo San Lucas and from Puerto Los Cabos in San José del Cabo; a half-day trip typically runs three to four hours, and morning departures tend to have flatter seas. Grey whales gather further north around Magdalena Bay, a long drive from Los Cabos, so most visitors here see humpbacks. Choose an operator with a visible permit and a small group size, and keep expectations realistic: sightings are never guaranteed, and December is early in the season.
Land-based whale watching is possible from the cliffs near the Arch and from the beaches at Cabo del Sol, though a boat gives you a much better chance. If you are prone to seasickness, take a sheltered Sea of Cortés trip rather than a Pacific-side run, and sit toward the middle of the boat. December mornings are often the calmest, so book the earliest departure you can manage. Bring a hat, a warm layer for the return leg and cash for tips, and leave the drone at the hotel — permits are restricted.
Where to Stay: Corridor, Cabo or San José
The three practical bases are Cabo San Lucas, San José del Cabo and the 30-kilometre resort corridor between them. Cabo San Lucas suits people who want the marina, Medano Beach and nightlife within walking distance; it is the liveliest and the noisiest. San José del Cabo is the quieter colonial town, with the estuary, Plaza Mijares and galleries, and it is closer to the airport — roughly 20-25 minutes by road, against 40-45 minutes to Cabo San Lucas. The corridor, stretching past Palmilla and Cabo del Sol, is where the large resorts with golf and spa facilities sit, and you will need a car or taxi for everything.
For a first December trip I would book the corridor if the priority is a resort pool and a quiet beach, and San José del Cabo if you want to walk to dinner. Cabo San Lucas makes sense for a short stay built around boats and bars. Rates peak between Christmas and New Year, so the first two weeks of December offer better value on the same rooms; book early rather than late, because the corridor's better properties fill first. Check whether your hotel is on a swimmable beach — several Pacific-facing stretches have strong surf and are not safe for casual swimming, so ask before you book if that matters.
Getting Around and What to Skip
The airport, Los Cabos International (SJD), sits inland near San José del Cabo. Shared shuttles run to the corridor and Cabo San Lucas, and private transfers cost more but save time on arrival; taxis are plentiful but not metered, so agree the fare first. Renting a car is worthwhile if you plan to split time between the two towns and the beaches in between, and parking in San José's centre is easier than in Cabo San Lucas. There is no useful train or bus network for tourists, so plan on road transport. December's dry weather makes driving straightforward.
Skip the temptation to cram both towns and the corridor into a three-night stay; the road time adds up and you will spend the trip in the car. Also skip Pacific-side swimming at beaches without lifeguards, and skip the cheapest whale-watching offers that promise guaranteed sightings. If you want a day away from the coast, the Sierra de la Laguna foothills around Santiago, roughly 45 minutes north, offer a different landscape and a cooler climate. Book accommodation through a local partner and confirm the transfer at the same time, so arrival day does not eat into your first afternoon.