Koh Rong in May
May is a transition month: hot at first, with the rainy season usually starting around the middle of the month.
| Average daytime high | 33 °C |
| Average night-time low | 25 °C |
| Average rainfall | 293 mm |
| Average sea temperature | 30.3 °C |
Long-term averages for nearby Sihanoukville: World Meteorological Organization 1982-2024; sea temperature: seatemperature.org.
Weather
Days are hot, at about 33°C on average, and showers become more frequent, often as short, heavy downpours in the afternoon or at night.
Sea and activities
The sea is at its warmest, around 30°C. It is still often calm in the first half of the month.
Holidays and crowds
The low season begins and many resorts start offering discounts. The island becomes noticeably quieter.