Bahias de Huatulco

For the most consistent visibility and calmer mornings, plan around the drier months, roughly Nov to Apr. This window often brings clearer water, with many days in the 15 m to 25 m range depending on swell. May and Oct can still be very good but more variable. During the rainy season (commonly Jun to Nov), runoff and storm swell can lower visibility toward 10 m and may shift site choice toward the most sheltered bays.

Local tourism sources commonly cite humpback whale migration along the Oaxaca coast from Oct to Apr. The most reliable experience is a dedicated whale watching tour from Santa Cruz. Underwater encounters are not guaranteed and responsible operators do not chase whales. On calm days, divers sometimes hear whale song underwater, especially when you are diving deeper structure like Isla Montosa. If whales are a priority, book whale watching early in your trip and keep a flexible schedule for sea conditions.

Parque Nacional Huatulco lists an entry fee (often sold as a bracelet) for visitors entering the protected area. Many dive, snorkel, and nine-bay boat tours operate inside the park, so the fee often applies on water days. Payment is typically handled through the park office or via authorized operators, and some tours include it while others charge separately. Confirm at booking, carry proof of payment, and follow the park rules such as 'look, do not touch' and avoiding sunscreen use in the water.

For first-timers, prioritize sheltered bays with easy entries. La Entrega is the headline option for shallow reef fish close to shore, often in 1 m to 5 m water. San Agustin and Maguey are also popular for calm-water windows and beach services. Go early for the smoothest surface, wear fins for control, and avoid standing on coral. If a bay looks choppy or milky after rain, switch to a more protected beach or do a topside day.

HUX is the closest airport for Huatulco. Most travelers transfer by taxi, hotel shuttle, or rental car to Santa Cruz, La Crucecita, or Tangolunda. A typical transfer is about a 20 km drive, but allow extra time in peak holiday weeks. If you are diving, ask your operator whether they can recommend a trusted taxi or arrange a pickup to match your boat departure time at Santa Cruz Marina. Keep small cash for taxis and tips, and confirm the fare before you depart the airport.

Many divers are comfortable in a 3mm wetsuit or even a thin suit because water is often warm, commonly around 26°C to 30°C depending on season and site. If you get cold easily, do long multi-dive days, or dive deeper points with thermoclines, pack a 5mm or add a hooded vest. For snorkeling and freediving, a rashguard or thin suit is often enough for warmth plus sun protection. Because the park discourages sunscreen in the water, long sleeves are useful year-round.

Most Huatulco dives are guided boat dives with moderate conditions, and many sites in sheltered bays work well for newer divers. Open Water is usually sufficient, but Open Water+ is a safer baseline if you want flexibility for deeper structure like Isla Montosa or more exposed points. The main challenges are Pacific swell and surge, plus variable visibility after rain. Bring an SMB, stay close to your guide in boat traffic areas, and be honest about air consumption and comfort so the operator can choose the best bay for the day.

Huatulco's rainy season is commonly described as running roughly Jun to Nov. Rain tends to arrive as afternoon showers, which can increase runoff and reduce visibility, especially right after heavy storms. Diving and snorkeling can still be good in sheltered bays, but conditions become more variable and boat routes may change. Build a plan B for wet-season afternoons: waterfalls, coffee villages, mezcal tastings, or ruins. Also keep an eye on tropical weather because the East Pacific hurricane season runs May 15 to Nov 30.

Use the destination's natural rhythm: schedule scuba or freedive sessions as early-morning boat departures, then plan shared afternoons. Non-divers can join the same boat days as snorkelers, or meet the group later for a Blue Flag beach afternoon, Copalita ruins, or dinner in La Crucecita. A strong template is two consecutive dive mornings, one inland day (waterfalls or coffee), and one bay tour day where everyone swims. Choose accommodation near Santa Cruz or La Crucecita to minimize transfer friction.

Before your first dive, confirm the operator's emergency action plan, oxygen availability, and the nearest medical referral pathway they use for suspected decompression illness. Save Mexico emergency number 911 and the local Red Cross number in your phone, and keep your dive insurance details accessible. If a serious dive injury is suspected, contact local emergency services first, then call the DAN Emergency Hotline (+1 919 684 9111) for medical coordination and evacuation support. Avoid same-day flying after diving and keep profiles conservative if you are doing multiple days.