Koh Rong in January
Last fact-checked: October 2026. Climate figures are long-term averages for nearby Sihanoukville.
January is one of the best months for Koh Rong: the heart of the dry season, with sunny days and pleasant evenings.
| Average daytime high | 31 °C |
| Average night-time low | 22 °C |
| Average rainfall | 27 mm |
| Average sea temperature | 27.8 °C |
Long-term averages for nearby Sihanoukville: World Meteorological Organization 1982-2024; sea temperature: seatemperature.org.
Weather
Expect mostly sunny skies, lower humidity than later in the year and very little rain. Nights are the coolest of the year, at around 22°C.
Sea and activities
The sea is usually calm and clear, which is ideal for snorkeling, diving, boat tours and crossing to the neighboring islands.
Holidays and crowds
Early January is still busy after the New Year holidays, and Chinese New Year sometimes falls in late January. It is peak season, so book ferries and accommodation ahead.
Best Beaches & Coast Conditions in January
Both the West Coast (Sok San / Long Beach) and East Coast (Long Set, Pagoda, Coconut Beach) enjoy glass-calm turquoise water in January, as dry northeast breezes blow gently offshore on the west coast.
- Recommended Activities: Peak underwater visibility (15–25 meters) for scuba diving at Koh Kon and Shark Point, effortless kayaking around Pagoda Island, and calm evening boat rides to spot glowing plankton.
- What to Pack & Booking Tip: Light breathable clothing, reef-safe sunscreen, sunglasses, and a light long-sleeved shirt for cool 22 °C evenings on the water. Book accommodation at least 3–4 weeks ahead.
Koh Rong Weather in January: FAQ
Is January a good month to visit Koh Rong?
January is arguably the single best month of the year to visit Koh Rong, with 8–9 hours of daily sunshine, minimal rainfall (~27 mm all month), comfortable 31 °C afternoons, and crystal-clear 27.8 °C sea water.
Are ferries reliable in January?
Yes, 100% of scheduled high-speed ferries run on time in January thanks to flat seas across the Gulf of Thailand.
Do I need to book hotels in advance for January?
Yes. Early January (New Year week) and late January (approaching Lunar New Year) see peak occupancy of 85–95% at beachfront resorts.