The month in detail
What to expect in September
September falls in the wet season in Koh Chang. Showers are often brief but intense. With 76% of rainy days, always have indoor alternatives planned.
September ranks 10 out of 12 months in Koh Chang. Compared to August: 5 pts fewer rainy days, −0.5h of sun per day.
This month's conditions
What it's like in September
UV index
7 · high
sunscreen and hat advised
Feels like
muggy at times
22°
Sea
30°C
warm, ideal
Daylight
12.1h of daylight
Air quality
good
AQI 22
Compare
Is September the right month?
The best month in Koh Chang is December (9.1/10), 4.7 pts 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 Chang
Expedia →
Activities
Tours, tickets, experiences
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Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Koh Chang
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 typeTropical
📈Climate trend ⓘStable
🔥Hottest monthApril · 29°C
❄️Coolest monthJuly · 26°C
🌧️Rainiest month ⓘAugust · 81%
🏝️ Tropical stay
🌞Dry season ⓘMay → Sep
🌧️Wet season ⓘDec → Mar
🌀Cyclones ⓘSeason Nov-Apr
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Location
Where is Koh Chang ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
ThailandTropical climate with a 9.1 → 4.3 gap between best and worst month. 10 years of ERA5 data to choose by project.
12.07°N · 102.33°E
Questions
Frequently asked questions
What is the best time to visit Koh Chang?
December is the best month with 28.0°C highs, 22.0°C lows, 8.1h of sunshine and 8.0% rainy days. The months of December & January offer comparable conditions.
How many hours of sunshine does Koh Chang get in December?
Koh Chang averages 8.1 sunshine hours per day in December. It is the sunniest month with a climate score of 8.8/10.
What is the rainiest month in Koh Chang?
August is the most unfavourable month with August has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Koh Chang in December?
In December, overnight lows reach 22.0°C, while afternoon highs average 28.0°C.
Is Koh Chang good in winter?
In winter (December-February), Koh Chang scores 8.6/10 on average — Decent period conditions for cultural visits.. The best month overall remains December with a score of 8.8/10.
When should you avoid Koh Chang?
August is the most difficult month to visit Koh Chang, with August 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 Chang in September?
In September, the sea averages 30°C in Koh Chang: warm, ideal. Ideal conditions for swimming and snorkeling.
Do you need sun protection in Koh Chang in September?
The average UV index reaches 7 in September in Koh Chang (high), with about 12.1h of daylight. Sunscreen and hat advised.