Koh Rong in April
April is one of the hottest months, with the first signs of the coming rainy season.
| Average daytime high | 32 °C |
| Average night-time low | 25 °C |
| Average rainfall | 145 mm |
| Average sea temperature | 29.8 °C |
Long-term averages for nearby Sihanoukville: World Meteorological Organization 1982-2024; sea temperature: seatemperature.org.
Weather
Daytime highs average about 32°C and it feels humid. Occasional thunderstorms start to appear, usually in the afternoon or evening.
Sea and activities
The sea is very warm, around 30°C, and mostly calm. Midday walks in the forest can be exhausting, so plan them for the morning.
Holidays and crowds
Khmer New Year (14-16 April in 2026) is the biggest holiday of the year. Many Cambodians travel to the coast, so ferries and accommodation fill up fast.