The short answer
When to go to Koh Chang
November to February is the best window on Koh Chang: dry, sunny and with calmer seas, which is when island boats run reliably. March to May gets very hot and from about May the rains build, with the heaviest rain from June to September. The climate figures here come from the mainland station at Trat, so the island's west coast is probably wetter. Many guesthouses close in the rainy season, and older travellers should avoid it.
Month by month
Koh Chang weather by month
| Month | High | Low | Rain | Verdict | What to expect |
|---|---|---|---|---|---|
| January | 32°C | 22°C | 51 mm | Driest, sunny and comfortable; seas calm | |
| February | 32°C | 23°C | 82 mm | Dry and bright; good for beaches and waterfalls | |
| March | 33°C | 24°C | 140 mm | Hotter, still mostly dry; start outings early | |
| April | 33°C | 25°C | 196 mm | Hottest month; showers building | |
| May | 33°C | 25°C | 420 mm | Rainy season starts; rough seas, some boats limited | |
| June | 32°C | 24°C | 777 mm | Heavy rain; many guesthouses close | |
| July | 31°C | 24°C | 1024 mm | Wettest period; rough seas, island boats scarce | |
| August | 31°C | 24°C | 970 mm | Very wet; island boat services stop | |
| September | 31°C | 24°C | 816 mm | Very wet; services still limited | |
| October | 32°C | 24°C | 338 mm | Rain easing; seas still variable | |
| November | 33°C | 24°C | 85 mm | Season reopens; drying out, calmer seas | |
| December | 32°C | 23°C | 28 mm | Dry and pleasant; busiest and best season |
Temperatures and rainfall are long-term monthly averages. Check the forecast a few days before you travel.
Seasons at a glance
Koh Chang seasons for families and seniors
The easiest months: January, February, November and December
- January: Driest, sunny and comfortable; seas calm
- February: Dry and bright; good for beaches and waterfalls
- November: Season reopens; drying out, calmer seas
- December: Dry and pleasant; busiest and best season
Good, with small trade-offs: March
- March: Hotter, still mostly dry; start outings early
Possible, with planning: April and October
- April: Hottest month; showers building
- October: Rain easing; seas still variable
Best avoided with parents or children: May, June, July, August and September
- May: Rainy season starts; rough seas, some boats limited
- June: Heavy rain; many guesthouses close
- July: Wettest period; rough seas, island boats scarce
- August: Very wet; island boat services stop
- September: Very wet; services still limited
Useful answers
Best time to visit Koh Chang: FAQs
What is the best month to visit Koh Chang?
January, February, November and December are the best months to visit Koh Chang, with March also good. November to February is the best window on Koh Chang: dry, sunny and with calmer seas, which is when island boats run reliably. March to May gets very hot and from about May the rains build, with the heaviest rain from June to September. The climate figures here come from the mainland station at Trat, so the island's west coast is probably wetter. Many guesthouses close in the rainy season, and older travellers should avoid it.
Which months should I avoid in Koh Chang with elderly parents?
May, June, July, August and September are the months to avoid with older travellers. Rainy season starts; rough seas, some boats limited Heavy rain; many guesthouses close
When does it rain most in Koh Chang?
July is the wettest month, with about 1024 mm of rain on average. The hottest month is April, with average highs around 33°C.