Koh Rong weather in January

January in Koh Rong: sweltering, a little rain, with muggy air — fine if you can take 35°C afternoons.

Updated September 2026 · climate normals from ERA5 reanalysis

Koh Rong🇰🇭 Cambodia · Southern Vietnam & Cambodia · Island90
  1. 90Jan
  2. 91Feb
  3. 85Mar
  4. 80Apr
  5. 63May
  6. 60Jun
  7. 54Jul
  8. 59Aug
  9. 51Sep
  10. 57Oct
  11. 76Nov
  12. 88Dec

#2 of 12 months in Koh Rong · #143 of 1413 destinations to visit in January · comfort 90/100 (tier S)

Days
30°C
Nights
25°C
Wet days
10
Sun
10.3 h
Humidity
78%
Daylight
12 h
Koh Rong, Cambodia
Photo: allPhoto Bangkok · Pexels

Traveller notes on Koh Rong in January

Notes from nearby Phu Quoc (95 km away)

Koh Rong doesn't have its own notes for January yet — these are about Phu Quoc, close enough to share the season.

Forum posters consistently call January one of the best times to visit, squarely inside the November-March dry season and the island's peak season as a result - clear water, reliable sunshine and calm seas are the norm. One visitor specifically noted that despite weather apps repeatedly forecasting storms throughout their stay, the reality was mostly sunny with only the odd brief downpour, describing conditions as close to perfect. Posters recommend booking accommodation ahead given the popularity of this window, and generally rate Phu Quoc as a more kid-friendly beach option than mainland alternatives like Mui Ne thanks to its calmer January seas.
Tripadvisor community · January · 1 month ago · about Phu Quoc · Read more on Tripadvisor ↗

Other months in Koh Rong

Koh Rong's forum describes August as a genuine mixed bag - a decent mixture of sun and rain, with some stretches going several days rain-free and others turning genuinely miserable. One island worker described 15 straight days where it rained almost around the clock, which posters treated as an extreme outlier rather than typical. When rain does hit, it's usually a heavy hour-to-90-minute burst at night, early morning or mid-afternoon, and rough seas can cancel boat trips on the worst days. Opinions on visiting are genuinely split - some steer clear of Koh Rong entirely in August, while one experienced regular was confident sunny days still outnumber wet ones.
KohRongIslandRegular · August · 1 month ago · Read more on Tripadvisor ↗
Forum posters place February inside Koh Rong's peak season, which runs roughly November through March and brings cool(er), dry conditions relative to the rest of the year - though posters are quick to add that the beaches themselves still run very hot and sunny by day, with water and a hat treated as essential rather than optional. The white-sand beaches and clear, warm water are repeatedly praised, with Sunset Beach singled out for its turquoise water. On the practical side, posters note some visitors worry about choppy seas delaying the ferry crossing even in the dry season, so building a buffer day into ferry-dependent travel plans is a common piece of advice.
Tripadvisor community · February · 1 month ago · Read more on Tripadvisor ↗

Add your own note from Koh Rong's card on the map.

Koh Rong climate normals — January

Daytime high30°C / 85°F🔥 sweltering
Nighttime low25°C / 77°F
Feels like (high)35°C / 95°F
Sea temperature28°C / 83°F♨️ bath-warm
Rainfall52 mm / 2.1 in🌦 some rain
Rainy days10 days
Humidity78%💦 very humid
Dew point23°C / 73°F
Sunshine10.3 h/day
Daylight11.6 h
Wind14 km/h / 8 mph
Air quality (US AQI)60🙂 moderate

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Koh Rong in January

How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.

BusyChinese New Year, school holidays in 6 of the markets that fill it(estimated)

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Peak crowdsBusyShoulder seasonQuiet

Best months for Koh Rong's weather

Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).

Best weatherKoh Rong's weather peaks December–February.

January includes Bioluminescent plankton.

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Best weatherFair weatherToughest weather

What's on in Koh Rong in January

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Holiday

    Chinese New Year

    20 Jan – 25 Feb · usuallyLunar New YearCrowdedBook early

    The island is a new-year destination for Chinese families and the bungalows at Koh Touch and Sok San are booked out well ahead. Turning up on the ferry and finding a bed does not work that fortnight. Source ↗

  • Nature

    Bioluminescent plankton

    1 Nov – 31 Mar · usuallyBioluminescence

    Calm dry-season water and a moonless night are what it takes; walk to a beach the resorts have stopped lighting and the water lights up where you move it. Nothing to see on a bright moon.

What's on around the world in January →

Nearby, and something's on

Within 300 km of Koh Rong — a day trip or a short hop — with something on this month. Never part of the comfort score.

Where is Koh Rong?

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Koh Rong in January — FAQ

Is January a good time to visit Koh Rong?
January in Koh Rong: sweltering, a little rain, with muggy air — fine if you can take 35°C afternoons. It ranks #2 of 12 months for Koh Rong on SeasonMap's comfort score (90/100).
What is the weather like in Koh Rong in January?
In January, Koh Rong averages a daily high of 29.7°C and a low of 25°C, with about 52.2 mm of rain over roughly 9.6 rainy days.
What is the air quality in Koh Rong in January?
Koh Rong has a mean US Air Quality Index of about 60 in January.

Within 300 km: Phu Quoc's Dry season around 15 Nov – 30 Apr, and Phnom Penh's Dry season around 15 Nov – 30 Apr.