Weather in the region is tropical - there are only two seasons: the hot season from January to April, and the rainy season from May to December.

Temperatures during the year average 25ºC to 32ºC (77ºF to 89.6ºF) and the yearly rainfall averages 2568.5mm. Unlike in say Europe, the rain in this region comes down heavily and quickly over short periods.

Weatherwise, the best time to visit Ko Lanta is between the months November to April when the area’s climate is less hot than usual. During this period the island gets a lot of dry North Easterly winds, so giving dry blue skies and starry nights. Then, down on the beaches one can enjoy nice sea breezes.

From May to October the area gets a lot of rainfall, more on average than the rest of the country. During this period the island gets a lot of moist South Westerly winds, so giving a mixture of dry days and wet ones.

The sea stays at a warm 29°C all year round.

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Based on a work at Wikitravel.org & Traveldudes.org.