Koh Rong in April
Last fact-checked: October 2026. Climate figures are long-term averages for nearby Sihanoukville.
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.
Best Beaches & Coast Conditions in April
The sea around Koh Rong is at its warmest (nearly 30 °C) and remains calm on both Long Set (east) and Sok San (west) before the southwest winds arrive in late May.
- Recommended Activities: Morning snorkeling, scuba diving, and early-morning or late-afternoon kayaking are best, avoiding the intense midday sun between 12:00 and 15:00.
- What to Pack & Booking Tip: Breathable UV-protective rash guard for snorkeling, sun hat, plenty of water, and early-booking confirmations if traveling during Khmer New Year (April 13–16).
Koh Rong Weather in April: FAQ
What happens on Koh Rong during Khmer New Year in April?
During Choul Chnam Thmey (mid-April), Cambodian families celebrate with beach picnics, music, and friendly water blessings. Ferries and resorts fill up completely, so book at least 3–4 weeks ahead.
Is April too hot on Koh Rong?
April is the warmest month (highs around 32.4 °C), but coastal sea breezes and 29.8 °C ocean water keep beach days very enjoyable, especially if you book an air-conditioned room.
Does the rainy season start in April?
No, April is a transition month with mostly sunny days and occasional late-afternoon tropical thunderclouds (~145 mm total rainfall).