Koh Lanta weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Good
Best time to visit: January – March
What is the weather like in Koh Lanta in December?
In December, Koh Lanta is hot: daytime highs average 29 °C, and even at night it stays warm at around 25 °C. The sea averages 28.7 °C – lovely and warm for swimming. Expect around 5 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 119 mm in total. The air is often humid and muggy. All in all, December is a good month for a holiday in Koh Lanta.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 65 | 74 | 87 |
| Day | 28° | 29° | 29° |
| Night | 25° | 25° | 25° |
| Sea | 29° | 29° | 29° |
| Sun | 5 h | 5 h | 6 h |
| Rain days | 23 | 13 | 7 |
More details for December
- Daylight
- 11 h 41 min06:28 – 18:09
- UV index
- 10 · very highclear sky, noon (estimate)All months
- Muggy days
- 31 daysdew point 18 °C or moreAll months
- Wind
- 15 km/haverage daily peakAll months
- Cloud cover
- 77 %on averageAll months
- Hot days
- 2 days30 °C or moreAll months
- Time zone
- UTC+7Asia/Bangkok
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %38 %
- Few rainy daysweight 20 %34 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in December
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Koh Lanta in December: quick answers
Is Koh Lanta hot in December?
Yes. In December, Koh Lanta is hot: daytime highs average 29 °C and nights stay around 25 °C. On about 2 days the thermometer climbs to 30 °C or more.
Can you swim in Koh Lanta in December?
Yes. In December the sea averages 28.7 °C – lovely and warm for swimming.
Does it rain much in Koh Lanta in December?
Rain is frequent, with about 13 rainy days and 119 mm in total.
Koh Lanta month by month
The whole year in Koh LantaAll destinations: ThailandWhere to go in DecemberSea temperature in December
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