Ko Lanta enjoys a tropical monsoon climate with warm temperatures year-round. Highs typically range from 29°C to 32°C, and nights are rarely cooler than 24°C. The dry season from November to April brings sunshine and gentle breezes, while the rainy season from May to October features frequent downpours and lush, green landscapes.
The best times to travel section shows how the months compare for a visit, so you can find the time of year that fits what you want to do.
Background colours of the months:
The colour shows the typical temperature: yellow (hot), green (mild) and blue (cold). How strong the colour is shows the travel season: full colour means high season, soft colour means shoulder season and soft-striped means off season.
Weather symbols:
Each month has one symbol showing what the weather is typically like, such as hot and sunny, freezing or a rainy or snowy season. Use them to quickly spot months that match the weather you want, or to avoid the ones that don't.
Crowdedness:
The people icon shows how busy the place usually is. The more people, the more crowded it gets.
Additional notes:
The grey info boxes point out special things worth knowing, like recurring weather issues or seasonal events.
Ko Lanta’s climate is defined by two main seasons: the dry season (November to April) and the rainy season (May to October). Temperatures remain consistently warm throughout the year, with average daytime highs of 29–32°C and nighttime lows around 24–26°C. March is usually the hottest month, with highs reaching 31–32°C, while January and February are slightly cooler and more comfortable for outdoor activities. Humidity is high year-round, ranging from 74% in the driest months to over 80% during the wettest period.
The dry season is characterised by clear skies, gentle northeast breezes, and minimal rainfall – January and February are the sunniest and driest months, often with just 30–40 mm of rain each and 6–7 hours of sunshine per day. The sea is calm and warm (around 29°C), ideal for swimming, diving, and boat trips. The rainy season, driven by the southwest monsoon, brings frequent heavy showers, especially from June to October. September and October are the wettest months, with up to 380 mm of rain and 20+ rainy days per month. Rain typically falls in short, intense bursts, often in the afternoon or evening, and the island remains lush and vibrant. Winds are stronger during this period, and the sea can become rough, occasionally affecting ferry services. Despite the rain, there are still many sunny intervals, and temperatures remain warm.
| Average climate data for Ko Lanta, Thailand | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Average maximum temperature (°C) | 33 | 34 | 34 | 34 | 33 | 32 | 31 | 31 | 31 | 31 | 31 | 31 | 34 |
| Average minimum temperature (°C) | 24 | 24 | 25 | 25 | 25 | 26 | 25 | 25 | 25 | 24 | 24 | 24 | 24 |
| Average precipitation (mm) | 15 | 18 | 61 | 118 | 244 | 258 | 300 | 304 | 330 | 330 | 146 | 56 | 2,177 |
| Average rainfall days (days) | 3 | 2 | 3 | 10 | 21 | 18 | 18 | 18 | 22 | 20 | 14 | 6 | 155 |
| Average relative humidity (%) | 74 | 75 | 77 | 78 | 84 | 84 | 84 | 85 | 85 | 86 | 86 | 80 | 81 |
| Average daily daylight hours (h) | 11 | 11 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 12 |
The best time to visit Ko Lanta is from December to March, during the dry season. These months offer warm, sunny days (29–32°C), calm seas, and minimal rainfall – perfect for beach days, snorkelling, and boat trips. The weather is most reliable, humidity is lower, and the island is lively with open restaurants and activities.
The least favourable time to visit is September and October, the peak of the rainy season. Heavy, frequent downpours and rough seas can disrupt travel plans, and some ferry services and beach resorts may close. While the island is lush and quiet, outdoor activities are often limited by the weather.
Ko Lanta has two main seasons: a dry season from November to April, with sunny, warm weather, and a rainy season from May to October, with frequent heavy showers and higher humidity.
Daytime highs in Ko Lanta typically range from 29°C in January to 32°C in March and April. Nights are warm, rarely dropping below 24°C, and humidity is high year-round.
September and October are the wettest months, with up to 380 mm of rain and over 20 rainy days each month. Rain falls in heavy bursts, often in the afternoon or evening.
The best beach weather is from December to March, when the sea is calm and the sun is out. During the rainy season, the sea can be rough and some water activities may be limited.
Pack light, breathable clothes, sun protection, and a hat for the dry season. For the rainy season, bring a rain jacket, waterproof shoes, and be prepared for sudden downpours.
No, Ko Lanta stays warm year-round. Even in the coolest months, daytime temperatures are around 29°C and nights rarely drop below 24°C.
Yes, the rainy season (May–October) sees fewer tourists, lower prices, and a quieter atmosphere. However, some resorts and ferry services may close or reduce schedules during this period.
The warmest month, with the highest average maximum temperature, is March (34.2 °C). The month with the lowest average maximum temperature is September (30.9 °C). Overall, the average maximum temperature over the whole year is 32.1 °C.
The month with the highest average minimum temperature is June (25.5 °C). The coldest month, with the lowest average minimum temperature, is December (23.6 °C). Overall, the average minimum temperature over the whole year is 24.6 °C.
The wettest month, with the highest amount of precipitation, is September (329.8 mm). The driest month, with the least amount of precipitation, is January (14.9 mm). Over the whole year there are 2,177.5 mm of rainfall on average.
The month with the most days of rain is September (22 days). The month with the fewest days of rain is February (2 days). Over the whole year there are 154.9 days of rain on average.
The month with the highest average relative humidity is October (86.2 %). The month with the lowest average relative humidity is January (74.2 %). The overall average relative humidity over the whole year is 81.3 %.
The month with the longest days, so the most daylight, is June (Average daylight: 12.1 h). The months with the shortest days, so the least daylight, are January and December (Average daylight: 11.1 h). Over the whole year there are 11.7 h of daylight per day on average.
