The short answer
When to go to Koh Lanta
The best window is December to February, with January and February driest at roughly 24 to 31 mm of rain a month and calm seas for boat trips; March is also good though hotter. From May to October rainfall runs from about 230 to 340 mm a month, the national park's smaller islands close to visitors from 16 May to 31 October, and many seasonal businesses cut back. For older travellers, the dry months also make ferry crossings and wet boat landings safer, so book flexible tours if you come at the edges.
Month by month
Koh Lanta weather by month
| Month | High | Low | Rain | Verdict | What to expect |
|---|---|---|---|---|---|
| January | 33°C | 24°C | 31 mm | Driest month, calm seas and clear days | |
| February | 34°C | 24°C | 24 mm | Lowest rain of the year; best beach weather | |
| March | 34°C | 25°C | 69 mm | Hot and mostly dry, with rain starting late | |
| April | 34°C | 25°C | 122 mm | Hotter and showery; some services start closing | |
| May | 33°C | 25°C | 228 mm | Wet season begins; small islands close from 16 May | |
| June | 32°C | 25°C | 286 mm | Heavy rain, rough seas, many island trips stop | |
| July | 32°C | 25°C | 288 mm | Wet and rough; many seasonal businesses cut back | |
| August | 31°C | 25°C | 342 mm | Wettest month; boats unreliable | |
| September | 31°C | 25°C | 319 mm | Very wet; sea trips mostly off | |
| October | 31°C | 25°C | 298 mm | Still wet; park islands reopen from 1 November | |
| November | 31°C | 24°C | 148 mm | Rain easing; season opens late in the month | |
| December | 31°C | 24°C | 65 mm | Dry, bright and busy around the holidays |
Temperatures and rainfall are long-term monthly averages. Check the forecast a few days before you travel.
Seasons at a glance
Koh Lanta seasons for families and seniors
The easiest months: January, February and December
- January: Driest month, calm seas and clear days
- February: Lowest rain of the year; best beach weather
- December: Dry, bright and busy around the holidays
Good, with small trade-offs: March
- March: Hot and mostly dry, with rain starting late
Possible, with planning: April, May and November
- April: Hotter and showery; some services start closing
- May: Wet season begins; small islands close from 16 May
- November: Rain easing; season opens late in the month
Best avoided with parents or children: June, July, August, September and October
- June: Heavy rain, rough seas, many island trips stop
- July: Wet and rough; many seasonal businesses cut back
- August: Wettest month; boats unreliable
- September: Very wet; sea trips mostly off
- October: Still wet; park islands reopen from 1 November
Useful answers
Best time to visit Koh Lanta: FAQs
What is the best month to visit Koh Lanta?
January, February and December are the best months to visit Koh Lanta, with March also good. The best window is December to February, with January and February driest at roughly 24 to 31 mm of rain a month and calm seas for boat trips; March is also good though hotter. From May to October rainfall runs from about 230 to 340 mm a month, the national park's smaller islands close to visitors from 16 May to 31 October, and many seasonal businesses cut back. For older travellers, the dry months also make ferry crossings and wet boat landings safer, so book flexible tours if you come at the edges.
Which months should I avoid in Koh Lanta with elderly parents?
June, July, August, September and October are the months to avoid with older travellers. Heavy rain, rough seas, many island trips stop Wet and rough; many seasonal businesses cut back
When does it rain most in Koh Lanta?
August is the wettest month, with about 342 mm of rain on average. The hottest month is March, with average highs around 34°C.