The short answer
When to go to Koh Rong
The best window is November to March, when rain is low and the sea is calmer for boats and swimming; December to February is the most comfortable. April and May are hotter and more humid, and from June to October the heavy rain and rough seas make crossings unreliable and many services reduce. For older travellers, choose December or February, book a resort with a boat transfer and plan quiet afternoons in the shade.
Month by month
Koh Rong weather by month
| Month | High | Low | Rain | Verdict | What to expect |
|---|---|---|---|---|---|
| January | 31°C | 22°C | 27 mm | Dry, calm seas; peak season, book early | |
| February | 31°C | 23°C | 31 mm | Dry and warm; good visibility | |
| March | 31°C | 24°C | 76 mm | Warming; showers begin late in month | |
| April | 32°C | 25°C | 145 mm | Hot and more humid; Khmer New Year crowds | |
| May | 33°C | 25°C | 293 mm | Rains set in; seas start to turn rough | |
| June | 31°C | 24°C | 509 mm | Wet season; rough seas, many services reduced | |
| July | 31°C | 24°C | 562 mm | Very wet; boats can be delayed | |
| August | 31°C | 24°C | 617 mm | Wettest month in this record | |
| September | 30°C | 23°C | 487 mm | Heavy rain; Long Set largely shut down | |
| October | 31°C | 23°C | 310 mm | Still wet; improves late month | |
| November | 31°C | 23°C | 118 mm | Rains ease; seas calming, services reopen | |
| December | 30°C | 22°C | 41 mm | Dry, comfortable; busy at New Year |
Temperatures and rainfall are long-term monthly averages. Check the forecast a few days before you travel.
Seasons at a glance
Koh Rong seasons for families and seniors
The easiest months: January, February and December
- January: Dry, calm seas; peak season, book early
- February: Dry and warm; good visibility
- December: Dry, comfortable; busy at New Year
Good, with small trade-offs: March and November
- March: Warming; showers begin late in month
- November: Rains ease; seas calming, services reopen
Possible, with planning: April and May
- April: Hot and more humid; Khmer New Year crowds
- May: Rains set in; seas start to turn rough
Best avoided with parents or children: June, July, August, September and October
- June: Wet season; rough seas, many services reduced
- July: Very wet; boats can be delayed
- August: Wettest month in this record
- September: Heavy rain; Long Set largely shut down
- October: Still wet; improves late month
Useful answers
Best time to visit Koh Rong: FAQs
What is the best month to visit Koh Rong?
January, February and December are the best months to visit Koh Rong, with March and November also good. The best window is November to March, when rain is low and the sea is calmer for boats and swimming; December to February is the most comfortable. April and May are hotter and more humid, and from June to October the heavy rain and rough seas make crossings unreliable and many services reduce. For older travellers, choose December or February, book a resort with a boat transfer and plan quiet afternoons in the shade.
Which months should I avoid in Koh Rong with elderly parents?
June, July, August, September and October are the months to avoid with older travellers. Wet season; rough seas, many services reduced Very wet; boats can be delayed
When does it rain most in Koh Rong?
August is the wettest month, with about 617 mm of rain on average. The hottest month is May, with average highs around 33°C.