San Andres is a coral island in the western Caribbean, sitting about 750 kilometers northwest of the Colombian mainland and actually closer to Nicaragua than to Bogota. It belongs to the Seaflower Biosphere Reserve, a UNESCO-designated area protecting one of the largest coral reef systems in the Americas. The island is known for its strikingly colorful water, locally called el mar de siete colores (the sea of seven colors), where shifting shades of blue, green, and turquoise shift over shallow reefs and sandbars. Raizal culture runs deep here: a mix of African, English, and Caribbean traditions that shows up in the island's Creole language, its reggae and calypso soundtrack, and dishes like rondon, a slow-cooked coconut milk stew loaded with fish, plantain, and yucca.
Your prime window for San Andres runs from early July through late September. This stretch delivers the driest weather of the year, with August seeing rain on roughly 4% of days and September close behind at 5%. July and August bring the island's peak tourist season, so book accommodation early, but September offers a sweet spot: still excellent weather, fewer visitors (the quietest month of the year), and lower prices. The Green Moon Festival, a weeklong Caribbean music and culture celebration, typically lands in early September, making it the most rewarding single month to visit. If that window doesn't work, spring (March through May) is a solid backup, with moderate rain, thinner crowds, and accommodation deals.
Spring in San Andres, Colombia
Spring on San Andres eases into the year with warm, steady conditions and noticeably fewer visitors than the summer and winter peaks. This is the time to rent a scooter or golf cart and loop the island's single coastal road at your own pace, stopping at beaches like Rocky Cay and San Luis without competing for shade under the coconut palms. Highs sit at 91.8°F (33.2°C), warm enough to spend full days in the water, and snorkeling conditions along the island's southwestern coast are excellent. Holy Week, which typically falls in late March or April, brings processions and church celebrations across the island, adding a reflective cultural layer to the beach-focused routine.
Rain picks up slightly as the season progresses, with March seeing precipitation on about 25% of days and April around 27%, but showers tend to be brief tropical bursts rather than all-day events. Lows hover at 73.1°F (22.8°C) overnight, so you won't need anything heavier than a light cotton layer for an evening stroll along Spratt Bight's boardwalk. Humidity stays moderate, climbing from around 59% in March to a similar range in May. Pack reef-safe sunscreen, a rash guard for snorkeling, and a compact rain jacket for the occasional downpour.
Tourism sits at its quieter end during spring, and accommodation prices reflect that with noticeable deals compared to the December and July peaks. Boat tours to Johnny Cay and El Acuario run daily, and you'll find shorter lines at the docks. May's Labour Day holiday can bring a brief bump in Colombian visitors, so if you're looking for the emptiest beaches, aim for mid-March through mid-April.
Summer in San Andres, Colombia
Summer is when San Andres delivers its best conditions for diving, snorkeling, and island-hopping. The water clarity around the Seaflower Biosphere Reserve reaches its peak, with visibility regularly exceeding 30 meters at dive sites scattered around the island. With nearly 40 dive spots to choose from, this is the season that draws certified divers and first-timers alike. Highs average 93.4°F (34.2°C), and the heat is real, but a light Caribbean breeze keeps things tolerable on the water. Grab a coco loco (rum poured into a fresh coconut) from a beach vendor and you'll manage just fine.
Rainfall drops to its lowest levels of the year: July sees rain on just 7% of days, and August is even drier at 4%. Humidity dips to comfortable levels, with August around 39.5% and July near 46%, making this the least sticky stretch on the island. Lows of 73.7°F (23.2°C) mean evenings along the Spratt Bight boardwalk are pleasant for wandering the restaurants and bars that line the waterfront. Try the fried fish served with coconut rice at one of the local spots, a dish that tastes best when the catch came in that morning.
This is the busiest season for tourism, with July topping the visitor charts alongside December. Accommodation prices rise accordingly, and boat tours to Johnny Cay and Haynes Cay fill up fast on weekends. Colombia's Declaration of Independence holiday in mid-to-late July adds an extra surge of domestic travelers. Book your hotel and any multi-island tours ahead of time, and consider weekday excursions to avoid the weekend crowds at popular cays.
Fall in San Andres, Colombia
September is arguably the single best month on San Andres: the crowds thin dramatically (it's the quietest month of the year), accommodation prices drop to their most affordable range, and the sky stays largely dry with rain appearing on only about 5% of days. The Green Moon Festival, the island's flagship cultural event running since 1987, typically takes place in early September. This weeklong celebration fills the island with live Caribbean music spanning reggae, calypso, gospel, and soca, alongside academic talks about Raizal heritage, traditional horse races, and open-air food stalls serving island specialties. Late September brings the year's peak heat, with highs reaching 96.5°F (35.8°C) and lows of 74.9°F (23.8°C), so stay hydrated and seek shade during midday hours. Seasonal average highs for the full fall period run 92.9°F (33.8°C) with lows of 73.4°F (23°C).
October marks a shift as precipitation climbs to about 23% of days, and November is the wettest month of the year with rain falling roughly 40% of days. Humidity rises noticeably by November, hitting around 64%. The Coconut Reign pageant and cultural festivities typically take place in November, giving you a reason to visit even as the weather turns less predictable. If you're planning a November trip, expect afternoon showers that can interrupt boat tours, so build flexibility into your itinerary and keep waterproof bags handy for electronics.
Dive operators and snorkel tour companies run year-round, and fall's lower visitor numbers mean smaller group sizes on boats heading to El Acuario and Haynes Cay. La Loma, the traditional hilltop village with its historic Baptist church dating to 1847, is worth a visit any time of year but feels especially unhurried during these quieter months. Bring lightweight, quick-dry clothing and a solid pair of water shoes for reef walking.
Winter in San Andres, Colombia
December kicks off the second-busiest stretch of the year as Colombian families descend on San Andres for holiday vacations, and the island's Fiestas de San Andres in early December honor the patron saint with parades, traditional dances like the paseo and mapale, and live music that spills through the streets. The Crab Festival on January 1 launches the new year with an abundance of crab dishes, dancing, and celebration. Highs average 92°F (33.3°C) with lows of 73°F (22.8°C), keeping conditions solidly tropical.
Rain frequency sits in a moderate range: December sees precipitation on about 26% of days, January drops to 15%, and February falls around 18%. Showers are usually short and shouldn't derail your plans, but they're frequent enough that a packable rain layer earns its suitcase space. Humidity stays in the mid-50s through most of winter, comfortable by Caribbean standards. The duty-free shopping centers in El Centro draw big crowds of Colombian tourists during the holiday weeks, and the commercial area can feel congested with traffic, particularly on weekends in late December.
January and February settle into a more relaxed rhythm after the holiday rush. Visitor numbers ease somewhat, and the weather cooperates for boat trips to Johnny Cay and snorkeling excursions along the western coast. Epiphany in mid-January is a public holiday that may affect business hours, so plan accordingly. For the best experience, stay on the quieter southern or eastern side of the island near San Luis or Cocoplum beach, where the pace slows down considerably compared to the commercial north end.
At a Glance
Monthly weather, visitor crowds, air quality, holidays, and daylight hours to help you plan your trip.
Travel Tips & Safety for San Andres, Colombia
San Andres has direct flights from Bogota, Medellin, Cartagena, and several other Colombian cities, with occasional international connections from Panama City. You'll need to purchase a tourist card at the airport before boarding your flight to the island. Once there, renting a scooter or golf cart is the most practical way to explore, since one main road loops the entire island in under an hour. Public buses also run the loop frequently and are an affordable alternative.
Tap water on San Andres is not safe to drink, so stick to bottled or filtered water throughout your stay. Keep cash in Colombian pesos on hand for beach vendors, small restaurants, and entry fees at attractions outside the main commercial area, as card acceptance can be spotty away from El Centro. The sun is intense year-round at this latitude, so apply reef-safe sunscreen generously and reapply after swimming.
San Andres generally feels safe for visitors, but keep an eye on belongings around the more crowded beach areas and the commercial waterfront in town, where opportunistic theft can happen. At popular natural sites like the blowhole, you may encounter persistent touts offering unsolicited guide services, so set clear boundaries early. Stick to well-lit areas at night and use common-sense precautions with valuables.