Koh Rong weather by month

The best time to visit Koh Rong is December to February — 91/100 in February, 30°C and 11 rainy days. The best season is the dry season, November to April (85/100 on average).

The worst month is September at 51/100 — sweltering, soaked, clean air. See September →

Updated September 2026 · climate normals from ERA5 reanalysis

Planning the wider trip? Best time to visit Cambodia →

Koh Rong🇰🇭 Cambodia · Southern Vietnam & Cambodia · Island91
  1. 90Jan
  2. 91Feb
  3. 85Mar
  4. 80Apr
  5. 63May
  6. 60Jun
  7. 54Jul
  8. 59Aug
  9. 51Sep
  10. 57Oct
  11. 76Nov
  12. 88Dec

Best season: November to April (85/100 on average) · worst September (51/100)

Days
30°C
Nights
25°C
Wet days
11
Sun
10.8 h
Humidity
79%
Daylight
12 h
Koh Rong, Cambodia
Photo: allPhoto Bangkok · Pexels

Koh Rong, month by month

Comfort score out of 100 for the kind of trip Koh Rong is best for, the average high, rainy days and hours of sun a day from the climate normals, and how busy it tends to be.

MonthScoreTierHighRainSunCrowdsOn
Jan90S30°C10 d10 hBusy2
Feb91S30°C11 d11 hPeak2
Mar85A31°C18 d11 hShoulder1
Apr80A31°C21 d11 hBusy1
May63C31°C29 d9 hShoulder—
Jun60C30°C28 d9 hShoulder1
Jul54D30°C30 d8 hQuiet1
Aug59D30°C30 d9 hShoulder1
Sep51D29°C29 d7 hQuiet1
Oct57D30°C28 d8 hQuiet1
Nov76B30°C17 d9 hShoulder1
Dec88A30°C8 d10 hBusy1

What's on in Koh Rong through the year

Festivals, natural spectacles, holidays and the seasons to watch out for — curated and sourced. The month pages carry the detail.

January
  • Chinese New Year20 Jan – 25 Feb (usually)Holiday
April
  • Khmer New Year13–17 AprHoliday
June
  • Rough crossings in the wet1 Jun – 15 Oct (usually)Season
November
  • Bioluminescent plankton1 Nov – 31 Mar (usually)Nature

Crowds in Koh Rong in February

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.

Peak crowdstravelers describe it as peak season, Chinese New Year, school holidays in 2 of the markets that fill it

Sourced from traveler notes: “Forum posters place February inside Koh Rong's peak season, which runs roughly November through March and brings cool(…” — Tripadvisor community

JFMAMJJASOND

Peak crowdsBusyShoulder seasonQuiet

Good to know before you go to Koh Rong

Real experiences from travellers' own write-ups, quoted with a link to the original.

Money

A guide to Koh Rong warns that despite the island now having more reliable electricity than in years past, ATMs still haven't arrived, so bringing all the cash you'll need for your entire stay is essential rather than assuming you can withdraw more once there. Their recommendation for seeing beyond the main beach: an ATV tour covers a genuine overview of the island and reaches remote beaches that would otherwise require a long walk through jungle terrain to find.
Our Escape Clause · Read the original ↗

Traveller notes on Koh Rong

What people who have been say about the place — the year-round notes first, then month by month.

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 ↗
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 ↗

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