By Kylian Dev
Koh Lanta in January
DryAverage highs of 32.6°C and lows of 24.1°C, with 31 mm of rain over about 3 days. A dry month: one of the best times to go.
Weather
Weather in Koh Lanta: the climate month by month
When to go to Koh Lanta, how hot it gets and when the rain comes: every month in detail, from the official climate averages of the Thai Meteorological Department, with my own advice on top.
- Official 1991–2020 averages
- 12 months in detail
- Best time: December to March
In short
The best time to visit Koh Lanta is December to March, the driest period of the year. The rainy season runs from May to October, and the wettest month is August, with 342 mm of rain over about 15 days. Daytime highs range from 30.9°C in September to 33.9°C in March, and nights never drop below about 23.9°C on average.
At a glance
Rain and temperatures in Koh Lanta, month by month
Bars show average rainfall; figures above them are the average daytime high and night-time low.
33°24°
31Jan
34°24°
24Feb
34°25°
69Mar
34°25°
122Apr
33°25°
228May
32°25°
286Jun
32°25°
288Jul
31°25°
342Aug
31°25°
319Sep
31°25°
298Oct
31°24°
148Nov
31°24°
65Dec
Month by month
Climate table for Koh Lanta
Click a month to see what else happens in Thailand that month: festivals, crowds and the best regions.
| Month | High | Low | Rain | Rainy days | Humidity | Verdict |
|---|---|---|---|---|---|---|
| January | 32.6 °C | 24.1 °C | 31 mm | 3 | 76 % | Dry |
| February | 33.5 °C | 24.4 °C | 24 mm | 2 | 74 % | Dry |
| March | 33.9 °C | 24.7 °C | 69 mm | 5 | 77 % | Dry |
| April | 33.8 °C | 25.1 °C | 122 mm | 9 | 80 % | Some rain |
| May | 32.6 °C | 25.4 °C | 228 mm | 14 | 83 % | Rainy |
| June | 31.9 °C | 25.3 °C | 286 mm | 15 | 83 % | Rainy |
| July | 31.6 °C | 25.1 °C | 288 mm | 15 | 83 % | Rainy |
| August | 31.2 °C | 25.2 °C | 342 mm | 15 | 83 % | Rainy |
| September | 30.9 °C | 24.8 °C | 319 mm | 17 | 85 % | Rainy |
| October | 31 °C | 24.5 °C | 298 mm | 18 | 86 % | Rainy |
| November | 31.3 °C | 24.3 °C | 148 mm | 12 | 84 % | Some rain |
| December | 31.4 °C | 23.9 °C | 65 mm | 8 | 80 % | Dry |
Total rainfall over the year: 2,220 mm.
Month by month
Koh Lanta in each month of the year
Koh Lanta in February
DryAverage highs of 33.5°C and lows of 24.4°C, with 24 mm of rain over about 2 days. A dry month: one of the best times to go.
Koh Lanta in March
DryAverage highs of 33.9°C and lows of 24.7°C, with 69 mm of rain over about 5 days. A dry month: one of the best times to go.
Koh Lanta in April
Some rainAverage highs of 33.8°C and lows of 25.1°C, with 122 mm of rain over about 9 days. Some showers, usually short: still a good month to go.
Koh Lanta in May
RainyAverage highs of 32.6°C and lows of 25.4°C, with 228 mm of rain over about 14 days. A rainy month: expect a shower most days and keep plans flexible.
Koh Lanta in June
RainyAverage highs of 31.9°C and lows of 25.3°C, with 286 mm of rain over about 15 days. A rainy month: expect a shower most days and keep plans flexible.
Koh Lanta in July
RainyAverage highs of 31.6°C and lows of 25.1°C, with 288 mm of rain over about 15 days. A rainy month: expect a shower most days and keep plans flexible.
Koh Lanta in August
RainyAverage highs of 31.2°C and lows of 25.2°C, with 342 mm of rain over about 15 days. A rainy month: expect a shower most days and keep plans flexible.
Koh Lanta in September
RainyAverage highs of 30.9°C and lows of 24.8°C, with 319 mm of rain over about 17 days. A rainy month: expect a shower most days and keep plans flexible.
Koh Lanta in October
RainyAverage highs of 31°C and lows of 24.5°C, with 298 mm of rain over about 18 days. A rainy month: expect a shower most days and keep plans flexible.
Koh Lanta in November
Some rainAverage highs of 31.3°C and lows of 24.3°C, with 148 mm of rain over about 12 days. Some showers, usually short: still a good month to go.
Koh Lanta in December
DryAverage highs of 31.4°C and lows of 23.9°C, with 65 mm of rain over about 8 days. A dry month: one of the best times to go.
Seasons
The three things to know about the weather in Koh Lanta
Best time
December to March. Least rain of the year, calmer sea on the coast and lots of sunshine. It is also the high season: book early.
Rainy season
May to October. Rain usually comes as heavy showers, often in the afternoon or at night, rather than all day. Peak in August (342 mm).
Hottest month
March, with average highs of 33.9°C and high humidity. Plan outdoor visits early in the morning.
My advice
What the numbers don't say about Koh Lanta
Koh Lanta has a very marked season: dry and calm from December to March, rainy from May to October. In the low season many bungalows on the southern beaches close, and the sea gets rough on the west coast, but prices fall by half. November and April are good compromises: little rain and fewer tourists.
Where these figures come from
Monthly averages over 1991–2020 from the Ko Lanta weather station of the Thai Meteorological Department, as published in the World Meteorological Organization climate normals. They describe a typical year, not a forecast: a given year can be wetter or drier.
Data table (Wikipedia, WMO/TMD normals)FAQ
Weather in Koh Lanta: your questions
When is the best time to visit Koh Lanta?
December to March is the best time: it is the driest period of the year in Koh Lanta, with the most sunshine. It is also the busiest and most expensive season, so book early.
Where to stay in Koh LantaWhen is the rainy season in Koh Lanta?
The rainy season runs from May to October. The wettest month is August, with about 342 mm of rain over 15 days on average. Showers are heavy but often short: add a light rain jacket to your Thailand packing list.
What is the hottest month in Koh Lanta?
March is the hottest month, with average highs of 33.9°C. The most pleasant month for temperatures is September, with highs of 30.9°C.
Is it worth going to Koh Lanta in the rainy season?
Yes, if you stay flexible. Prices drop, there are fewer tourists and the scenery is green. Expect a shower most days, allow spare days for boat trips and get travel insurance that covers cancellations.
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