Huatulco is warm all year, but the season you choose changes what you see, how busy the beaches are and which excursions are at their best. The national protected-areas commission describes the park climate as hot and semi-humid, around 28 degrees Celsius, so you will rarely be cold. What changes is rainfall, sea conditions, wildlife and the number of other visitors. This guide covers the Huatulco coast and does not cover Oaxaca City.
The dry, busy season: late autumn to early spring
From roughly November into spring the weather is drier, the skies are clearer and the forest turns browner. This is the most popular time to visit, especially around Christmas, New Year and Easter, when hotels and tours book up early and prices rise. Direct winter flights from some Canadian and US cities add to the crowd. If you travel in these months, reserve hotels and key tours such as the bays boat tour well ahead, and expect busier beaches at Santa Cruz and Maguey. Early mornings remain peaceful, and the dry weather is excellent for hiking, ruins and waterfalls trips.
Whale season
Humpback whales arrive along this coast from late November and stay into early April, so a dolphin and whale cruise is a highlight of the winter months. Dolphins can be seen at other times, but whales are the big draw. Book a cruise a few days ahead and go in the morning, when the sea is usually calmer. Sightings can never be guaranteed, so treat each outing as a chance rather than a promise. The same season suits boat tours in general, since calm mornings make for comfortable crossings.
The green season: summer into autumn
The commission notes that the park is greenest from June to November, after the rains, and the hills behind the coast are lush. Rain usually arrives as short, heavy showers rather than all-day downpours, and the sea can be warm and clear between storms. Waterfalls look fullest at this time, and trails can be slippery, so wear shoes with good grip. Crowds are smaller, rooms are cheaper and you may have beaches to yourself, which suits travellers who prefer quiet and value. Pack a light rain layer, insect repellent and a waterproof bag for electronics.
Hurricane season
The Pacific hurricane season runs through the autumn, so keep your plans and cancellation terms flexible if you travel then. Check weather forecasts and your travel insurance, follow local guidance and be prepared to change days if boat trips are suspended. Many trips go ahead smoothly, but sea conditions can change quickly. Check the current travel advisories from your own government before you book and again before you fly.
Turtles and wildlife through the year
Turtle nesting and hatching vary by month, so the sightings you hope for on a turtle release trip depend on your dates. Birdwatchers do well in the drier months, when the forest is more open, while the green months bring lush scenery and more insects. Bioluminescence is usually easiest to see on very dark nights, away from the full moon, in the warmer months. Ask operators what is likely on your dates before you book wildlife trips.
Choosing your month
For beach weather, whales and a lively atmosphere, go in the dry winter months and book early. For lower prices, greener scenery and fewer people, go in the rainy season, accepting a few showers and the possibility of schedule changes. Shoulder periods can offer a good balance, with decent weather and thinner crowds. Whichever month you choose, plan outdoor activities for the morning, keep afternoons flexible, and build a spare day into your itinerary so that a rough sea or a rainy day does not cost you the trip you most wanted.
Packing by season
Whatever the month, bring light, breathable clothing, a hat, sunglasses and reef-safe sunscreen, because the sun is strong all year. In the dry months, add a light layer for breezy boat rides and cool evenings by the water. In the green months, pack a compact rain jacket, quick-dry clothes and shoes with grip, plus insect repellent for the evenings. Bring a reusable water bottle, a waterproof pouch for your phone and any seasickness tablets you may need, and keep copies of your bookings in case plans change.
