Koh Rong in December
December is the start of the high season, with dry, sunny weather and a calm sea.
| Average daytime high | 30 °C |
| Average night-time low | 22 °C |
| Average rainfall | 41 mm |
| Average sea temperature | 28.7 °C |
Long-term averages for nearby Sihanoukville: World Meteorological Organization 1982-2024; sea temperature: seatemperature.org.
Weather
Expect sunny days around 30°C, low humidity and very little rain.
Sea and activities
Calm, clear water makes it ideal for swimming, snorkeling, diving and boat tours.
Holidays and crowds
Christmas and New Year are the busiest time of the year. Book ferries and accommodation well in advance.