Thailand in March: Weather, Crowds and What to Expect

March marks the transition from comfortable dry season into the pre-monsoon heat. The southern beaches and islands remain in excellent condition, but temperatures across the country climb noticeably. In the north, burning season reaches its worst point. March rewards travellers who focus on the coast and islands while avoiding prolonged time in Chiang Mai.

Weather by Region

Bangkok is hot, climbing to 33-36°C by mid-March. Humidity begins to rise but rain remains rare. The heat is manageable in air-conditioned malls and temples, but full days of outdoor sightseeing become tiring. Evening exploration — night markets, riverside dining, rooftop bars — is more comfortable than midday.

Chiang Mai and the north are at the worst point of burning season. March consistently records the poorest air quality of any month in Chiang Mai, with AQI readings regularly exceeding 200 (unhealthy). The haze is caused by agricultural burning in Thailand, Laos, and Myanmar, and is trapped in the valley. We recommend avoiding extended stays in Chiang Mai in March if air quality concerns you.

Andaman Coast (Phuket, Krabi, Koh Phi Phi, Koh Lanta) remains dry and hot with excellent sea conditions. This is the final stretch of prime diving season — the Similan Islands close in May, so March and April are the last chance for liveaboard trips until November. Koh Lipe ferry services run on full schedules.

Gulf Coast (Koh Samui, Koh Phangan, Koh Tao) is hot and mostly dry. The inter-monsoon period means occasional afternoon showers but nothing sustained. Koh Tao diving remains excellent, and the island is busy with dive certification students.

Diving Season

The Similan Islands liveaboard season peaks in March-April. Whale shark encounters at Richelieu Rock are at their most frequent. Manta ray sightings increase at Koh Bon. On the Gulf side, Chumphon Pinnacle whale shark season continues through April — Koh Tao dive shops run daily trips to the pinnacle when sightings are reported.

Festivals and Events

March is relatively quiet on the festival calendar. Makha Bucha Day (full moon of the third lunar month, often in February or March) is a national Buddhist holiday — alcohol sales are banned for 24 hours and bars close. Temples hold evening candlelit processions. Check dates before travelling if your plans depend on nightlife.

Prices and Crowds

Late high season. Prices remain elevated at beach resorts but begin to soften compared to December-February peak. European visitors on spring breaks keep the islands busy. Accommodation is easier to find at short notice than in January-February, but popular spots like Koh Phi Phi and Railay Beach still benefit from advance booking.

Where to Go in Thailand in March

• Bangkok: Bangkok city guide
• Chiang Mai: Chiang Mai guide
• Phuket: Phuket guide
• Koh Samui: Koh Samui guide
• Koh Phangan: Koh Phangan guide
• Krabi: Krabi guide

Planning

See the best time to visit Thailand for a full seasonal comparison, or the Thailand budget guide for cost planning. Browse Thailand tours and day trips — March is the last month for Similan Islands liveaboards and peak season for island day trips from Phuket and Krabi.