Ambergris Caye is Belize's largest island, a 25-mile sliver of sand and mangrove stretching along the western hemisphere's longest barrier reef. The main town of San Pedro runs on golf cart traffic, fresh ceviche, and a laid-back Caribbean rhythm that locals affectionately call Belize Time. This is the country's diving and snorkeling epicenter: Hol Chan Marine Reserve, Shark Ray Alley, and the legendary Great Blue Hole draw underwater explorers from around the world, while the food scene delivers lobster, conch fritters, and fry jacks at open-air spots perched right over the turquoise water.
Your best window for Ambergris Caye runs from mid-March through late May. This stretch lines up with the driest weather of the year, comfortable humidity, and warm seas perfect for snorkeling and diving the reef. April is one of the driest months on the island, with rain on roughly 6% of days, and the Easter holiday period brings lively beach gatherings and a festive atmosphere in San Pedro. Crowds thin out compared to the peak winter season, giving you better availability at waterfront restaurants and dive shops. If you can't make the spring window, December through February is a strong backup: it's the busiest season with the highest energy on the island, though you'll pay more and book further in advance.
Spring in Ambergris Caye, Belize
Spring is when Ambergris Caye hits its sweet spot. The reef visibility is excellent, making this the ideal stretch for booking a snorkeling trip to Hol Chan Marine Reserve or a full-day dive excursion to the Great Blue Hole. Highs average 87.8°F (31°C), warm enough for full days on the water without the oppressive heat that arrives later. Rain is scarce: April sees precipitation on just 6% of days, and March and May stay nearly as dry, so you can plan outdoor activities with confidence.
March is the busiest month on the island, so if you arrive early in the season expect higher energy around San Pedro's waterfront bars and restaurants. By April, visitor numbers dip noticeably, and you'll find it easier to grab a table for conch ceviche at a beachfront spot without a wait. The Easter holiday, which typically falls in late March or April, brings locals and visitors together for beach parties and festive gatherings across the island. Evenings cool to 75.3°F (24.1°C), comfortable enough for open-air dining without the mosquitoes that swarm later in the year.
Humidity sits at its annual low in April, around 69.7%, which makes a real difference when you're walking the sandy streets of San Pedro or exploring the ancient Maya ruins at Marco Gonzalez on the island's southern tip. A gentle sea breeze picks up through the season, strongest in May, keeping afternoons pleasant. Pack reef-safe sunscreen, a lightweight rash guard for snorkeling, and a wide-brimmed hat for golf cart rides around the island.
Summer in Ambergris Caye, Belize
Summer on Ambergris Caye brings the island's biggest cultural events along with its most intense heat. Lobster season opens on July 1st, and the annual Lobster Fest turns San Pedro's beachfront into a multi-day celebration of grilled, curried, and ceviche-style lobster dishes, live music, and cooking competitions. Later in the summer, the Costa Maya Festival fills a week in August with traditional dance performances, marimba music, and the Miss Costa Maya pageant, drawing visitors from across the Mesoamerican region. Highs average 89.1°F (31.8°C), and the heat is relentless, so plan water activities for the morning and save the festivals for after the sun drops.
This is the start of the rainy season, with showers appearing on roughly 28% to 34% of days from June through July. Afternoon downpours can be heavy but typically pass within an hour or two, leaving dramatic sunsets in their wake. Mid to late August brings the peak heat of the year, with highs reaching 90.1°F (32.3°C) and overnight lows of 77.6°F (25.3°C), making air conditioning a necessity rather than a luxury. The humidity climbs into the mid-70s, and the combination of heat and moisture means you'll want to stay hydrated and take breaks in the shade.
Tourist numbers drop during summer, which means lower accommodation rates and less competition for dive boats. La Fiesta de San Pedro in late June honors the island's patron saint with parades, traditional dances, and community fairs, giving you a genuine window into local Belizean culture. Lows average 78.1°F (25.6°C) even at night, so pack the lightest clothing you own and plenty of bug spray for evenings outdoors.
Fall in Ambergris Caye, Belize
Fall is the quietest season on Ambergris Caye, and it comes with real tradeoffs. September is the least busy month of the year, and October isn't far behind, meaning you'll have the reef practically to yourself if you choose to visit. But this is also the heart of hurricane season, which officially runs through the end of November, and weather systems can disrupt travel plans on short notice. Precipitation is at its highest: October is the wettest month, with significant rain on about 35% of days, and September follows closely. Highs average 87.1°F (30.6°C) with lows of 74.4°F (23.6°C), still warm but not as punishing as the summer peak.
September does have cultural energy that compensates for the weather risk. St. George's Caye Day in mid-September kicks off a stretch of patriotic celebrations, with parades and street festivals featuring food, live music, and historical reenactments. Belize Independence Day follows on September 21st, filling San Pedro with colorful parades, fireworks, and dancing. In mid-to-late November, Garifuna Settlement Day honors the arrival of the Garifuna people to Belize's shores with drumming, punta dancing, and traditional dishes like hudut, a fish-and-coconut-broth specialty. On the island, you'll hear Garifuna drummers performing around town and can seek out Garifuna cuisine at local restaurants.
Accommodation prices drop to their lowest levels of the year, and some smaller resorts and tour operators may reduce their schedules or close temporarily. If you visit in fall, keep an eye on weather forecasts and have flexible travel insurance. Reef-safe sunscreen and a quality rain jacket are both essential packing items for this stretch.
Winter in Ambergris Caye, Belize
Winter is high season on Ambergris Caye, and the island buzzes with energy from December through February. North American visitors arrive in droves to escape cold weather back home, filling San Pedro's restaurants, bars, and dive shops. December is especially lively, with Christmas and New Year's celebrations centered around the town's central park, where fireworks light up the Caribbean sky at midnight. Highs average 83.6°F (28.7°C), the coolest temperatures of the year, and occasional cool fronts from the north bring refreshing breezes that make afternoons on the water genuinely pleasant.
Carnival, Belize's pre-Lenten celebration, typically falls in February with body painting, costumed dancers, and street parades. It's a raucous, colorful event mostly centered in Belize City, but the festive spirit carries over to San Pedro. Lows dip to 70.5°F (21.4°C), the only time of year you might want a light layer for an evening boat ride. Rain does show up: precipitation occurs on roughly 10% to 27% of days across the season, with January being the wetter end. Despite this, extended dry spells are common, and mornings are often crisp and cloudless.
The tradeoff for winter's superior weather is higher prices and the need to book well in advance, especially around Christmas and New Year's. Popular snorkeling tours to Hol Chan and Shark Ray Alley fill up days ahead, so reserve spots before you arrive. Bring a mix of swimwear for daytime, a light long-sleeve for breezy evenings, and reef-safe sunscreen for every outing.
At a Glance
Monthly weather, visitor crowds, air quality, holidays, and daylight hours to help you plan your trip.
Travel Tips & Safety for Ambergris Caye, Belize
Getting to Ambergris Caye is straightforward: short commuter flights from Belize City take about 15 minutes, or you can ride the water taxi from the Belize City terminal, which runs roughly 90 minutes. Golf carts are the primary way to get around the island, available for rent from numerous shops in San Pedro. Both U.S. dollars and Belize dollars are widely accepted, with a standard exchange rate of two Belize dollars per one U.S. dollar.
Stick to bottled or filtered water throughout your stay, and don't skip the bug spray, especially at dusk when mosquitoes come out in force. The sun is intense year-round, so reef-safe sunscreen protects both you and the barrier reef ecosystem. If you're planning mainland excursions to jungle sites or cave tubing, bring water shoes for wading through streams.
Ambergris Caye is generally safe for visitors, but use common sense: avoid walking poorly lit areas alone late at night, and don't leave valuables unattended on the beach. Hurricane season runs from June through November, so if you visit during those months, monitor weather forecasts and consider flexible booking options.