Koh Rong in October
October is the end of the rainy season, with gradually more dry days.
| Average daytime high | 31 °C |
| Average night-time low | 23 °C |
| Average rainfall | 310 mm |
| Average sea temperature | 29.3 °C |
Long-term averages for nearby Sihanoukville: World Meteorological Organization 1982-2024; sea temperature: seatemperature.org.
Weather
Rain decreases to around 300 mm over the month and sunny spells become longer.
Sea and activities
The sea becomes calmer towards the end of the month, and snorkeling conditions improve.
Holidays and crowds
Pchum Ben (10-12 October in 2026) is a major holiday when many Cambodians travel, so expect busier ferries around those dates.