Koh Lanta weather in May
Temperature, sea and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Good
Best time to visit: January – March
What is the weather like in Koh Lanta in May?
In May, Koh Lanta is hot: daytime highs average 29 °C, and even at night it stays warm at around 26 °C. The sea averages 30.4 °C – almost as warm as a bath. Expect around 6 hours of sunshine a day. It is the rainy season: rain falls on about 27 days, totalling 259 mm. On about 7 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, May is a good month for a holiday in Koh Lanta.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 12 h 28 min06:06 – 18:34
- UV index
- 13 · extremeclear sky, noon (estimate)All months
- Muggy days
- 31 daysdew point 18 °C or moreAll months
- Wind
- 13 km/haverage daily peakAll months
- Cloud cover
- 85 %on averageAll months
- Hot days
- 7 days30 °C or moreAll months
- Time zone
- UTC+7Asia/Bangkok
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %43 %
- Few rainy daysweight 20 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in May
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Koh Lanta in May: quick answers
Is Koh Lanta hot in May?
Yes. In May, Koh Lanta is hot: daytime highs average 29 °C and nights stay around 26 °C. On about 7 days the thermometer climbs to 30 °C or more.
Can you swim in Koh Lanta in May?
Yes. In May the sea averages 30.4 °C – almost as warm as a bath.
Does it rain much in Koh Lanta in May?
It rains often – on about 27 days, adding up to 259 mm.
Koh Lanta month by month
The whole year in Koh LantaAll destinations: ThailandWhere to go in MaySea temperature in May
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences