When to visit Koh Rong (2026 Update)
HIGH SEASON (DRY)
- Late NOVEMBER to mid-MAY -
This is the optimal time to visit Koh Rong for guaranteed beach weather. In 2026, climate patterns remain consistent: the skies are generally cloudless, and the ocean is flat and crystal clear, making it perfect for snorkeling, diving, and boat tours.
- Cool & Dry (Dec - Feb): The absolute best weather. Daytime temperatures hover around 28-30°C (82-86°F) with lower humidity and a refreshing ocean breeze. Highly recommended, but expect peak accommodation prices.
- Hot & Dry (Mar - May): Temperatures peak, often exceeding 35°C (95°F). The humidity rises significantly just before the monsoon. Excellent for swimming, but midday jungle trekking can be exhausting.
Travel Tip: Book your ferries and accommodation well in advance if you plan to travel around Christmas, New Year, or the Chinese New Year.
GREEN SEASON (WET)
- Mid-MAY to early NOVEMBER -
Often referred to as the "Green Season," the monsoon months bring higher humidity and frequent rain, but also lush jungle landscapes and spectacular cloud formations. It rarely rains all day.
- Hot & Wet (Jun - Aug): Expect short, intense tropical downpours, usually in the late afternoon or overnight. You can still enjoy plenty of sunshine during the day. The island is much quieter, and resorts offer significant discounts in 2026.
- Peak Monsoon (Sep - Oct): These are historically the wettest months. Sea conditions can become rough, occasionally causing ferry cancellations. Snorkeling visibility drops.
Travel Tip: If traveling in the wet season, choose accommodation near the main piers (like Koh Touch or Long Set) to avoid difficult cross-island transfers in rough weather.
Sea Conditions & Plankton Visibility
The sea is calmest from December to April. If your main goal is to see Koh Rong's famous bioluminescent plankton, it is visible year-round. However, the best viewing conditions are during the dry season on nights with a new moon (no moonlight), when the sky and water are darkest.