Things to Do in Koh Samui in February

February is one of Koh Samui's most reliable months: the northeast monsoon has cleared, leaving daytime highs around 30–32°C (86–90°F), calm seas, and an average of just 50mm of rain across the entire month. You can realistically plan beach days every day without a weather backup plan. It is still high season, so Chaweng and Lamai are lively rather than deserted, and accommodation prices run roughly 20–30% above shoulder-season rates — book beachfront guesthouses at least six weeks ahead to avoid disappointment.

March extends the dry season on Koh Samui's Gulf coast, with temperatures nudging up to 33°C (91°F) and humidity beginning to build toward the island's wetter months. Rainfall is still minimal — typically 60–80mm — and the sea stays calm and clear, making it a fine time for snorkelling around Koh Tao and day trips into Ang Thong Marine Park. Prices soften compared to February and the beaches thin out noticeably, making March an excellent shoulder-season sweet spot for travellers who can be flexible.

February is arguably Krabi's finest month: the Andaman coast is deep in its dry season, with near-zero rainfall, underwater visibility exceeding 20 metres at dive sites, and air temperatures between 26–32°C (79–90°F). Railay Beach and the Four Islands day trip are at peak photogenic condition. The trade-off is that everyone else knows this — long-tail boat queues build by mid-morning and room prices are at their annual high, so book early and set your alarm for sunrise beach sessions.

February sits in Bangkok's cool-dry season, offering some of the city's most comfortable sightseeing conditions: temperatures between 24–33°C with low humidity and almost no rain. If Chinese New Year falls in February that year (the date shifts with the lunar calendar), Yaowarat Chinatown fills with red lanterns, lion dances, and exceptional street food — it is genuinely one of Bangkok's most atmospheric events and worth building a stopover around if your flight connections allow.

Phuket in February is textbook Andaman dry season: 27–32°C, mostly cloudless skies, and seas calm enough for liveaboard trips to the Similan Islands (one of the world's top dive destinations, and open only November–May). The island is firmly in peak-tourist mode, so Patong Beach feels crowded and rates are elevated. Kata Noi and Kamala Beach offer the same flawless weather with a noticeably more relaxed atmosphere.

May marks the start of Koh Samui's rainy season as the southwest monsoon sweeps across the Gulf of Thailand. Rainfall rises sharply — averaging around 180mm for the month — and afternoon downpours become a daily routine rather than an occasional inconvenience. The upside is real: room rates can fall 30–50% from peak levels, the interior jungle turns an extraordinary shade of green, and you will share the beaches with far fewer people. Snorkelling visibility drops and some smaller boat trips are suspended, so factor those limits into your plans.

Koh Samui sits in the Gulf of Thailand, which does produce serious tropical depressions and storms — but the risk is concentrated in November and early December when the northeast monsoon is at full strength. The island experienced significant flooding in 2011 and damaging storms in previous decades during that window. February, however, is firmly outside the storm season: the northeast monsoon has spent itself, seas are calm, and the risk of any meaningful tropical system is negligible.

The Gulf of Thailand stays warm year-round, and Koh Samui's coastal waters typically read 28–30°C (82–86°F) regardless of season. In February you can expect around 29°C — no wetsuit needed even for extended snorkelling sessions. Water clarity also peaks in the February–April window, with visibility often reaching 10–15 metres off the northern and eastern beaches, which makes the short ferry trip to Koh Tao especially worthwhile for snorkellers and beginner divers.

For December, Phuket wins clearly. Koh Samui's rainiest period is November–December when the northeast monsoon drenches the Gulf coast — some resorts quietly reduce staffing and a few close entirely. Phuket, on the opposing Andaman coast, is enjoying its sunniest and calmest weather of the year in December, with conditions ideal for diving and island-hopping. The one exception: early-to-mid December on Koh Samui can still deliver decent weather before the heaviest rains arrive, so if your dates fall in the first ten days of the month it is worth checking recent forecasts.

Chinese New Year — falling anywhere between late January and mid-February depending on the lunar calendar — brings genuine festive energy to Koh Samui's Chinese-Thai communities, particularly around Nathon Town, with dragon parades, red lanterns, and special seafood banquet menus at local restaurants. Makha Bucha Day, a major Buddhist public holiday that also falls in February or early March, sees temples across the island hold candlelit circumambulation processions at dusk; Wat Phra Yai near the Big Buddha is a particularly atmospheric spot to witness this quietly moving ceremony.

February is the best month of the year for day trips, full stop. Ang Thong Marine Park — an archipelago of 42 uninhabited islands about 30km northwest of Samui — runs daily tours from Nathon Pier (roughly 1,500–2,000 THB per person including transfers, kayaking, and lunch), and the calm seas mean the 45-minute speedboat crossing is smooth even for those prone to seasickness. The ferry to Koh Phangan runs multiple times daily and takes around 30 minutes, and Koh Tao — the Gulf's best diving island — is reachable in about 1.5 hours, with PADI open-water courses available for around 9,000–12,000 THB.