Meteo Distretto di Ko Lanta in maggio

Phuket-forum threads on May weather place it right at the start of the green season - hot and humid between showers, with posters generally expecting around an hour of rain most days rather than a full washout, and conditions described as noticeably less wet than the August-through-October stretch later in the year. Experiences vary trip to trip: some visitors report a stretch of very hot, mostly clear days, others get the more typical reliable afternoon downpour. The clearest upside is value - hotel prices drop meaningfully and the island runs far less crowded than the December-to-March high season. The one caution: posters flag rougher seas can make swimming unsafe on certain beaches, worth checking flag warnings. The record: 33.2C days feeling like a punishing 39C, 26.1C nights, a notably high 280mm across 25.4 days, 81 percent humidity, a 31.2C sea and 9.2 hours of sun.

Ko Lanta's forum confirms August is genuinely rainy season on the Andaman coast, with rough, stormy seas as much a factor as the rain itself - but experiences vary widely. One regular visitor who'd been six times including in low season said they'd only hit real rain once; another described a typical day as sunny with a quick thunderstorm rolling through in the afternoon or evening rather than a washout. Many smaller resorts close for the season from June through early November, though the mainland ferry keeps running year-round regardless.

Forum posters consistently name January and February as by far the driest, most reliable months on Koh Lanta, with several repeat visitors saying they've barely seen rain across multiple separate January/February trips - one describing a full three weeks without a drop. One visitor specifically reported a February day at 32C with not a cloud in the sky. Posters do note this isn't an absolute guarantee: some travelers have hit a rainy, overcast stretch that dampened snorkeling plans even within this generally dry window, but the clear consensus is that February sits at the reliable peak of the island's dry season.