Mexico in December: Where the Weather Is Best, When Whales Arrive and Which Dates to Avoid

Mexico in December is one of the easiest winter-sun calls you can make, but the country is big enough that “Mexico” doesn’t tell you much. The Caribbean beaches are warm, the Pacific is dry and full of arriving whales, and the highlands around Mexico City and Oaxaca are sunny by day and properly cold at night. The catch is the calendar: the second half of the month is the busiest, priciest stretch of the whole year. This guide gives you the real numbers for each region, the dates that matter and a plan that works around them.

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Yes, December is a good time to visit Mexico. It is the start of the dry season across most of the country: Cancún averages about 29 °C (84 °F) by day with a 27 °C sea, Puerto Vallarta and Los Cabos are dry and sunny, and Mexico City and Oaxaca reach the low to high 20s °C by day but drop to 8–11 °C at night. The hurricane season has ended, sargassum is usually low, and whale season begins on the Pacific. Prices and crowds peak from mid-December to New Year.

Is Mexico in December Worth It? The Honest Answer by Region

For almost every region, yes: December is when the rains have stopped and the heat hasn’t built yet. Both hurricane seasons that affect Mexico, the Atlantic and the eastern Pacific, officially end on 30 November, according to the US National Hurricane Center. That’s a big reason the beach resorts flip into high season right as the month begins.

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Comparing Mexico with other places that stay warm this month? Our round-up of warm-weather destinations in December lines it up against the Caribbean, Asia and Africa, and our guide to Dubai in December covers the drier, desert version of winter sun.

Mexico Weather in December: The Real Numbers

The short version: hot sun everywhere, but a big gap between day and night once you go inland and uphill. The table below uses long-term averages from national weather station records, so treat them as a baseline rather than a forecast.

Mexico in December: Where the Weather Is Best, When Whales Arrive and Which Dates to Avoid

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Two things jump out. Cancún is the wettest place on the list, because cold fronts from the north can push showers and wind onto the Caribbean side; it’s still mostly sunny, just less bone-dry than the Pacific. And the highlands swing hard: Oaxaca can feel like summer at 2 p.m. and need a jacket by 9 p.m. Mexico City has even recorded frost on rare nights.

Cancún, Tulum and the Yucatán: Beach Season Starts, Sargassum Usually Doesn’t

The Caribbean coast is Mexico’s December headline, and for good reason. The sea sits around 27 °C (81 °F), the humidity of summer is gone, and the cenotes (natural limestone sinkholes filled with fresh water) feel refreshing rather than cold. It’s the right month for snorkelling the reef, the ruins at Tulum and Cobá, and day trips to Mérida or Chichén Itzá while the heat is gentle.

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The thing that surprises people is the “norte”, a cold front that blows down from the north. When one arrives you get a day or two of strong wind, choppier sea, some rain and cooler evenings, especially on the Cancún and Riviera Maya side. Boat trips can be cancelled and the beach flags can go red. Then it clears and the sun is back. Build one flexible day into any snorkelling or island plan, and don’t schedule your Isla Mujeres or Cozumel trip for your last morning.

The sargassum question, answered honestly

Sargassum is the brown seaweed that piles up on Caribbean beaches. Its peak on this coast is usually June and July, and November to March is generally the clear-water window, with December and January among the cleanest months. That’s the pattern, not a promise: beach conditions can change within a day, and some winters have seen unusual arrivals. The University of South Florida’s satellite monitoring tracks open-ocean seaweed, and several local sites post daily beach reports.

The Pacific Coast in December: Puerto Vallarta, Los Cabos and the First Whales

Pick the Pacific if you want the driest weather and the best wildlife. Puerto Vallarta averages fewer than two rainy days in December, Cabo San Lucas about one, and both stay in the high 20s °C by day. The difference is the evenings: Cabo drops to around 14 °C (57 °F), so a sweater for dinner on the marina is sensible, while Vallarta stays warmer at about 18 °C (64 °F).

Whale season is the big December story, but the timing is narrower than many tour sites suggest. In Los Cabos, the official season when operators can legally run whale-watching trips is 15 December to 15 April, according to Mexico News Daily’s Los Cabos whale guide. Humpbacks are the most common sighting; early whales often show up in November, and the peak is January to March. In Banderas Bay off Puerto Vallarta, local operators open the humpback season in early December and run it into late March, with January and February the best months.

Mexico City and Oaxaca: Cool Nights, Dry Skies and the Best Festive Calendar

If you’d rather eat, walk and see ruins than lie on a beach, December in the highlands is hard to beat. Mexico City gets about one rainy day in the whole month, and the air is clearer than in the spring. Oaxaca is similar: around 29 °C (84 °F) in the afternoon sun and 11 °C (52 °F) at dawn, with almost no rain. Monte Albán, Teotihuacán and the other big sites are pleasant to walk in this weather, and Rough Guides notes they’re quieter in early December than later in the month.

The city also dresses up. Mexico City’s Zócalo usually hosts a Christmas market and a giant tree, and food stalls everywhere sell tamales and ponche, a hot fruit punch with guava, cinnamon and sugar cane. In Oaxaca, the run-up to Christmas fills the streets with lights, markets and processions. Check the event dates below before you lock yours.

What’s On: Guadalupe, Posadas and the Night of the Radishes

December is Mexico’s most festive month, and three moments shape it. Plan for them, or plan around them.

There’s a quieter natural event too. Monarch butterflies spend the winter in the fir forests of Michoacán and the State of Mexico, and the public sanctuaries such as El Rosario and Sierra Chincua usually open in the second half of November. December visits work well on a day trip or overnight from Mexico City; the reserves are high and cold in the early morning.

Want to see how other countries’ December calendars compare? Our free Festival Month Matcher lines up festivals by month, and families can find more ideas in our guide to family-friendly destinations for December festivities.

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Crowds and Prices: Why the Month Splits Around 15 December

December opens Mexico’s high season, which runs through April in the big resorts, and the jump happens mid-month. Rough Guides’ Mexico in December page puts it plainly: crowds and hotel prices rise especially from mid-December through New Year’s, and the first two weeks are the better window for value. Mexican families travel at Christmas too, so it isn’t only foreign visitors filling beaches and buses.

Locked into the holiday week? Book flights and rooms as early as you can, and look out for minimum-stay rules at resorts over Christmas and New Year. Our December travel tips to avoid crowds and save money covers the date and booking tactics in detail, and the free When to Book Calculator shows how far ahead to buy. If you’re also flying through busy hubs, read how to prepare for flight delays in December.

What to Pack for Mexico in December

Pack for two climates: most good December routes mix coast and highlands.

• A warm mid-layer and a light jacket: for highland nights around 8–11 °C, Cabo evenings and the occasional norte on the Caribbean.
• Reef-safe sunscreen, a hat and sunglasses: the sun is strong at altitude and on the water, and some cenotes and reef parks ask you to skip regular sunscreen.
• Closed walking shoes: for ruins, cobbled colonial streets and the monarch trails.
• Light, covered clothing for churches: shoulders and knees covered for the Basilica and cathedrals.
• Cash in small notes: for markets, posada stalls and tips; many small vendors don’t take cards.

For a full checklist, use our December winter packing list or the free Packing by Season Generator.

A 10-Day Mexico in December Itinerary: Culture First, Beach Last

Highlands first, Caribbean last, so you fly home rested. Best in the first half of the month; for whales, swap the Yucatán for Puerto Vallarta.

When Not to Go: The December Weeks to Avoid

Weather isn’t the problem in Mexico in December; the calendar is. Skip 20 December to 2 January if you can, because that’s the year’s peak for prices and crowds at the beaches, ruins and on the roads. Avoid arriving in Mexico City on 11–12 December unless the Guadalupe feast is your reason to go: roads around the Basilica close and the north of the city is packed. And if whales are the goal, don’t book Los Cabos for early December, since the official season only starts on the 15th.

Not sure whether your dates fall in a bad window? Use our free tool to check whether your month is a bad one, and see the Storm Season Check if you’re also weighing November.

4 Mistakes People Make With Mexico in December

Mexico in December: Your Questions Answered

The single most useful thing to remember about Mexico in December is that the weather is reliable all month, so your dates should be chosen by the calendar: early December for value, mid-month for whales and posadas, the holiday weeks only if you have to. Pick the region that fits your trip, book in the right order, and it’s one of the best winter escapes you can plan. For more ideas across the month, browse our best travel destinations in December.