Koh Lanta Weather in December 2026: what to expect (5.1/10)

The month in detail

What to expect in December

December falls in the wet season in Koh Lanta. Showers are often brief but intense. With 51.0% of rainy days, always have indoor alternatives planned.

December ranks 4 out of 12 months in Koh Lanta. Compared to November: +2°F daytime, 35 pts fewer rainy days, +2.2h of sun per day.

This month's conditions

What it's like in December

UV index

7 · high

sunscreen and hat advised

Feels like

very humid

23°

Sea

29°C

warm, ideal

Daylight

11.6h of daylight

Air quality

good

AQI 30

Compare

Is December the right month?

The best month in Koh Lanta is February (5.5/10), 0.4 pt higher than December.

See February →See all 12 months →

Context

Our verdict

Koh Lanta, island on the Andaman coast in Thailand south of Krabi: 30,000 inhabitants over 19 miles long, one of the calmest and most family-friendly islands in southern Thailand (alternative to neighbouring Phuket and Koh Phi Phi). Turquoise sea, long golden-sand beaches on the west coast, national park to the south (Mu Ko Lanta).

Read Gilles' full review →

Book

Plan your trip

Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.

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Stay

Hotels & rentals · Koh Lanta

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Activities

Tours, tickets, experiences

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Flights

Multi-airline comparator

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🎟️ Activities & tours · Koh Lanta

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Practical info

What you need to know before you go

Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a tropical stay.

Country · Thailand

🗣️LanguageThai

💶CurrencyThai Baht (฿)

🚗DrivingLeft-hand

🛡️Safety ⓘSafe · 2/5

💰Cost of living ⓘCheap · 2/5

🌡️ Climate

🌍Climate typeEquatorial tropical

📈Climate trend ⓘStable

🔥Hottest monthFebruary · 90°F

❄️Coolest monthAugust · 84°F

🌧️Rainiest month ⓘMay · 87%

🏝️ Tropical stay

🌞Dry season ⓘMay → Sep

🌧️Wet season ⓘDec → Mar

🌀Cyclones ⓘNone (equator)

Explore

Other destinations in December

If December doesn't convince you for this destination, compare with others.

Similar climate

Nearby

Koh SamuiThailand247 km

PenangMalaysia275 km

Koh TaoThailand299 km

Other top picks

🗺️ See all 754 destinations on the map

Location

Where is Koh Lanta ?

Global position + regional geographic context.

🌍 World

🔍 Geographic context

Thailand

Equatorial tropical climate with a 5.5 → 4.5 gap between best and worst month. 10 years of ERA5 data to choose by project.

7.53°N · 99.04°E

Questions

Frequently asked questions

What is the best time to visit Koh Lanta?

February is the best month with 90°F highs, 77°F lows, 8.1h of sunshine and 23.0% rainy days.

How many hours of sunshine does Koh Lanta get in February?

Koh Lanta averages 8.1 sunshine hours per day in February. It is the sunniest month with a climate score of 5.2/10.

What is the rainiest month in Koh Lanta?

May is the most unfavourable month with May has the lowest climate score of the year and the lowest climate score of the year.

What are the temperatures at night in Koh Lanta in February?

In February, overnight lows reach 77°F, while afternoon highs average 90°F.

Is Koh Lanta good in winter?

In winter (December-February), Koh Lanta scores 5.1/10 on average — Difficult period — prefer the peak season.. The best month overall remains February with a score of 5.2/10.

When should you avoid Koh Lanta?

May is the most difficult month to visit Koh Lanta, with May has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.

Can you swim in Koh Lanta in December?

In December, the sea averages 84°F in Koh Lanta: warm, ideal. Ideal conditions for swimming and snorkeling.

Do you need sun protection in Koh Lanta in December?

The average UV index reaches 7 in December in Koh Lanta (high), with about 11.6h of daylight. Sunscreen and hat advised.