The month in detail
What to expect in September
September falls in the wet season in Koh Lanta. Showers are often brief but intense. With 51% of rainy days, always have indoor alternatives planned.
September ranks 8 out of 12 months in Koh Lanta.
This month's conditions
What it's like in September
UV index
7 · high
sunscreen and hat advised
Feels like
oppressive heat
24°
Sea
30°C
warm, ideal
Daylight
12.0h of daylight
Air quality
good
AQI 20
Compare
Is September the right month?
The best month in Koh Lanta is January (5.8/10), 0.8 pt higher than September.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Koh Lanta
Expedia →
Activities
Tours, tickets, experiences
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Flights
Multi-airline comparator
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🎟️ Activities & tours · Koh Lanta
GetYourGuide selection · free cancellation
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 ⓘOctober · 54%
🏝️ Tropical stay
🌞Dry season ⓘMay → Sep
🌧️Wet season ⓘDec → Mar
🌀Cyclones ⓘNone (equator)
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Location
Where is Koh Lanta ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
ThailandEquatorial tropical climate with a 5.8 → 4.8 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?
January is the best month with 88°F highs, 77°F lows, 7.6h of sunshine and 16.0% rainy days.
How many hours of sunshine does Koh Lanta get in January?
Koh Lanta averages 7.6 sunshine hours per day in January. It is the sunniest month with a climate score of 5.6/10.
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 January?
In January, overnight lows reach 77°F, while afternoon highs average 88°F.
Is Koh Lanta good in winter?
In winter (December-February), Koh Lanta scores 5.5/10 on average — Acceptable conditions for cultural visits.. The best month overall remains January with a score of 5.6/10.
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 September?
In September, the sea averages 86°F in Koh Lanta: warm, ideal. Ideal conditions for swimming and snorkeling.
Do you need sun protection in Koh Lanta in September?
The average UV index reaches 7 in September in Koh Lanta (high), with about 12.0h of daylight. Sunscreen and hat advised.