Koh Rong is Cambodia’s most talked-about island, and for good reason. The beaches are long, the water is warm, and on clear nights the bioluminescent plankton turns the ocean into something you’ll struggle to describe to people back home. But the best time to visit Koh Rong is not the same for everyone, and getting the timing wrong means dealing with rough seas, ferry cancellations, or finding yourself on a half-empty island with shuttered bars.
This guide breaks down the island’s weather season by season, month by month, so you can plan a Cambodia trip that actually matches what you’re looking for.
What Is Koh Rong?
Koh Rong is the second-largest island in Cambodia, sitting in the Gulf of Thailand roughly 15 kilometres off the coast of Sihanoukville. The island covers about 78 km² (30 sq mi) and has four main villages: Koh Touch (the busiest hub), Prek Svay, Daemm Thkov, and Sok San. Around 1,100 residents live here, most working in fishing or tourism.
Koh Rong Island on map
The terrain is hilly, topped at 317 metres, and most of the interior is dense tropical rainforest with streams and small waterfalls. The northern and eastern coasts have the white-sand beaches most visitors come for. The southern tip is rockier, with cliffs and coral reefs better suited for diving than sunbathing.
In total, Koh Rong has 23 individual stretches of sand across 43 kilometres of coastline. The most visited are Koh Touch Beach (close to the pier and all the nightlife), Long Set Beach (quieter, with fewer guesthouses), and Saracen Bay on the eastern side, which is calmer and better for families. There is no airport on the island. The only way in is by ferry from Sihanoukville, which takes about 45 minutes to an hour by speedboat.
Best Time to Visit Koh Rong Island for Different Travelers
The right month depends on what kind of trip you’re after.
Koh Rong
- For beach and water activities: December to March is the window. Visibility underwater is good, seas are calm, and you can plan snorkeling or kayaking without worrying about cancellations. Koh Rong tours that include island activities are best scheduled in these months.
- For budget travelers: May or October are the sweet spots. You get lower accommodation prices, manageable rain, and far fewer people on the beaches. Just build some flexibility into your plans in case ferry services are affected.
- For nightlife and parties: The Full Moon Party at Police Beach runs monthly through the dry season. The Nestival series at Nest Beach Club happens from November to April. If this is what you’re coming for, December through February gives you the most options.
- For families: January and February are the calmest months with the most predictable weather. The water is clear enough for kids to snorkel, and ferries run without disruption.
- For cultural experiences: Mid-April coincides with Khmer New Year (Chau Chnam Thmey), one of the most important Cambodian festivals. In the island’s fishing villages, you’ll see traditional Buddhist ceremonies, folk games, and communal food celebrations that are a genuine glimpse into Cambodian life rather than a tourist performance.
Koh Rong Weather: The Best Time to Visit and the Others
Koh Rong has a tropical monsoon climate with two clearly defined seasons. Year-round temperatures stay between 25°C (77°F) and 32°C (90°F), even in the coolest months. What changes is rainfall, sea conditions, and humidity, and those differences matter a lot when you’re planning beach time or boat trips.
1. Dry Season (November to April): The Best Overall Window
- Daytime temperature: 28°C to 32°C (82°F to 90°F).
- Night temperature: 22°C to 25°C (72°F to 77°F)
Koh Rong weather in dry season
November through April is when Koh Rong is at its most accessible. Skies are mostly clear, seas are calm, and rainfall drops below 50mm per month in the peak months of December and January.
This is the right time to visit if you want reliable ferry crossings, good snorkeling visibility, kayaking in flat water, and evenings on the beach without worrying about a downpour. The Full Moon Parties at Police Beach run through this season, and the Nestival music events at Nest Beach Club also fall in the dry months.
The trade-off is crowds and cost. December and January are the most popular months, and accommodation prices go up. Budget guesthouses on Koh Touch can fill up weeks ahead, especially around Christmas and New Year. Booking at least two to three weeks in advance is worth it during peak season.
Month by month in the dry season:
- November: The rains ease off, seas settle, and prices drop from their October low. Good time to visit if you want quieter beaches and better weather than the previous few months.
- December to February: The clearest, coolest months. Best beach weather of the year, with water visibility good enough for snorkeling without a guide. Busiest and most expensive period.
- March to April: Temperatures climb toward 34°C (93°F) and humidity picks up again. Still dry, and beaches are good, but you’ll feel the heat by mid-afternoon. Khmer New Year falls in mid-April and brings a different kind of energy to the island, with festivities in the fishing villages.
2. Rainy Season (May to October): Quieter, Cheaper, More Mixed
- Daytime temperature: 25 to 32°C (77 to 90°F).
- Night temperature: ~26°C (79°F)
Koh Rong weather in rainy season
The wet season runs from May to the end of October. Rainfall peaks in July and August at 300 to 500mm per month, and humidity sits around 80% to 90%. Most rain falls as afternoon or evening showers rather than all-day downpours, so mornings are often clear enough for a swim or a short hike.
The honest version: ferry services can be reduced or cancelled during rough weather, some guesthouses and restaurants close entirely, and the bioluminescent plankton tours stop running on choppy nights. If you’re coming specifically for snorkeling or island-hopping, the wet season is not ideal.
That said, Koh Rong in the low season has its own appeal. The jungle is genuinely green, the beaches are nearly empty, and rates for accommodation can drop by 30% to 50% compared to peak months. Travelers who’ve visited in October, just before the season fully turns, often describe it as one of the better times, with improving weather, low prices, and far fewer people.
Month by month in the rainy season:
- May: Rains begin but are still irregular. A reasonable shoulder-season option if budget matters.
- June to August: Heaviest rainfall and roughest seas. Ferry schedules are unreliable. Not recommended for a first visit.
- September to October: Rain starts to ease. By mid-October the seas calm noticeably and some guesthouses begin to reopen for the coming season.
Koh Rong Weather by Month: Quick Reference
| Month | Avg Temp | Rainfall | Sea Conditions | Crowd Level |
| January | 28°C (82°F) | Very low | Calm | High |
| February | 29°C (84°F) | Very low | Calm | High |
| March | 31°C (88°F) | Low | Calm | Medium-High |
| April | 33°C (91°F) | Low | Mostly calm | Medium |
| May | 32°C (90°F) | Medium | Mixed | Low |
| June | 30°C (86°F) | High | Rough | Very Low |
| July | 29°C (84°F) | Very High | Rough | Very Low |
| August | 29°C (84°F) | Very High | Rough | Very Low |
| September | 29°C (84°F) | High | Mixed | Very Low |
| October | 29°C (84°F) | Medium | Improving | Low |
| November | 28°C (82°F) | Low | Calm | Medium |
| December | 27°C (81°F) | Very low | Calm | High |
Events and Festivals Worth Timing Your Trip Around
Full Moon Party at Police Beach
Energetic atmosphere at Fullmoon Party at Police Beach, Koh Rong, Cambodia
The Full Moon Party happens every full moon night on Police Beach, plus occasional Wednesday and Saturday nights during peak season. It’s an outdoor beach party with DJ sets, fire dancing, neon body paint, and the kind of crowd that comes from all over Southeast Asia specifically for this. It starts late and runs until morning. If you’re not into loud music and crowds, it’s worth knowing so you can plan your stay accordingly.
Nestival at Nest Beach Club
Nestival at Nest Beach Club
Nestival is a recurring music and arts event at Nest Beach Club on the west coast of the island. International DJs, themed nights, yoga sessions, beach games, and outdoor film screenings are all part of it. It runs during the dry season, November to April, and has built a following among travelers who want something more curated than a full moon rave.
Khmer New Year (mid-April)
Khmer New Year, or Chaul Chnam Thmey is the most vibrant festival in Cambodia
Khmer New Year falls on April 13 to 15 each year. On Koh Rong, celebrations happen in the fishing villages, not on the tourist beaches. Buddhist ceremonies, traditional games, and communal meals open to visitors who show up respectfully. It’s a genuinely different way to spend time on the island if you’re interested in Cambodian culture beyond the beach.
How to Get to Koh Rong
There is no airport on Koh Rong. All access is by ferry from Sihanoukville.
From Sihanoukville: Two ferry companies run the route regularly: Speed Ferry Cambodia and GTK Koh Rong Ferry. Speedboat crossings take 45 minutes to an hour. Slow ferries take closer to two hours. One-way tickets cost around $10 to $15 per person. Ferry schedules are reduced in the wet season and cancelled entirely during rough weather, so check conditions if you’re traveling between June and September.
Getting to Sihanoukville: From Phnom Penh, buses take four to five hours (around $10 to $15). Domestic flights are also available from Phnom Penh to Sihanoukville, with the journey taking under an hour. From Siem Reap, most travelers fly to Phnom Penh first and then continue by bus or domestic flight.
>>> If you’re combining Koh Rong with a broader Cambodia trip, the standard route is Phnom Penh or Siem Reap first, then Sihanoukville, then the island.
Is Koh Rong Expensive?
Relative to other Southeast Asian beach destinations, Koh Rong is affordable, though prices have risen since the early backpacker years.
A budget guesthouse on Koh Touch costs around $20 to $40 per night in peak season. Mid-range bungalows with air conditioning and sea views run $50 to $100. Higher-end resorts on the quieter beaches like Sok San start from $120 upward.
Food is cheap. A full meal of grilled fish, rice, and a drink at a local restaurant costs around $5 to $8. Fresh seafood at the beach restaurants is a bit more, around $8 to $15 per dish.
The most important thing to know about money on Koh Rong: there are no ATMs on the island. Both USD and Cambodian Riel (KHR) are accepted, with many places preferring dollars. 10,000 Riel is roughly equivalent to $2.50.
Bring enough cash from Sihanoukville before boarding the ferry, and then some extra.
Practical Tips for Visiting Koh Rong
A few things that regularly catch first-time visitors off guard:
- No ATMs: Bring all the cash you need from Sihanoukville. Credit cards are accepted at some resorts but not at smaller guesthouses, restaurants, or tour operators.
- Internet is patchy: On Koh Touch you’ll find reasonable WiFi at most guesthouses, but head to Long Set Beach or Sok San and connectivity drops significantly. A Cambodian 4G SIM card picked up in Phnom Penh or Sihanoukville is more reliable than depending on hotel WiFi.
- Bring your own supplies: Sunscreen, insect repellent, any prescription medication, and basic pharmacy items are either unavailable or expensive on the island. Stock up on the mainland.
- Ferry timing: Morning ferries are generally more reliable than afternoon ones. If you’re flying out of Sihanoukville the same day you leave the island, give yourself at least a three-hour buffer. Ferry delays, particularly in shoulder season, are common.
- Book accommodation early in peak season: December through February gets busy. Two to three weeks ahead for budget places, a month or more for mid-range options near the beach.
Conclusion: When Is the Best Time to Visit Koh Rong?
| Factor | Best Period |
| Overall weather | November to April |
| Peak season (best conditions) | December to February |
| Shoulder season (good value) | November, March to April |
| Budget travel | May or October |
| Nightlife and events | December to March |
| Cultural experiences | Mid-April (Khmer New Year) |
| Avoid (rough seas/ferry cancellations) | June to September |
The honest answer: December to February is when Koh Rong is at its best for most travelers. The weather is reliable, the sea is calm, the beaches are in good shape, and the island has enough going on to fill a week without effort. If those months don’t fit your schedule, November and March are solid alternatives that avoid the worst of the peak-season crowds.
If you’re planning a broader Cambodia holiday that includes Angkor Wat and Phnom Penh alongside the island, the dry season itinerary works well across all of those destinations. Contact us so our team can help put together a tailored Cambodia trip that fits your travel window and budget.
>>> Refer to Koh Kong, Kaoh Kong, Cambodia Weather Forecast | AccuWeather.
Read more:
Do ferries still run regularly during the wet season? I’m a bit worried about getting stuck on the mainland if there’s a storm.
Dear Armani,
Thank you for your message and great question! Yes, ferries generally continue to run regularly during the wet season, especially between major routes like the mainland and popular islands. However, in the event of severe storms or rough seas, there may be temporary delays or cancellations for safety reasons — but these are usually well-communicated in advance by local authorities or ferry operators.
If you need help booking ferries or arranging alternative transport, feel free to reach out — we’re always here to assist!
Best regards,
IDC Travel Team
Are there any special events or festivals on Koh Rong during the dry season? I would love to know to plan my trip around, thanks for your sharing.