Koh Rong weather in May

May in Koh Rong: sweltering, soaked, with clean air — a gamble, with 29 rainy days.

Updated September 2026 · climate normals from ERA5 reanalysis

Koh Rong🇰🇭 Cambodia · Southern Vietnam & Cambodia · Island63
  1. 90Jan
  2. 91Feb
  3. 85Mar
  4. 80Apr
  5. 63May
  6. 60Jun
  7. 54Jul
  8. 59Aug
  9. 51Sep
  10. 57Oct
  11. 76Nov
  12. 88Dec

#7 of 12 months in Koh Rong · #1130 of 1413 destinations to visit in May · comfort 63/100 (tier C)

Days
31°C
Nights
27°C
Wet days
29
Sun
9.4 h
Humidity
85%
Daylight
13 h
Koh Rong, Cambodia
Photo: allPhoto Bangkok · Pexels

Traveller notes on Koh Rong in May

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 — May

Daytime high31°C / 88°F🔥 sweltering
Nighttime low27°C / 81°F
Feels like (high)38°C / 100°F
Sea temperature31°C / 88°F♨️ bath-warm
Rainfall337 mm / 13.3 in⛈ soaked
Rainy days29 days
Humidity85%💦 very humid
Dew point26°C / 79°F
Sunshine9.4 h/day
Daylight12.6 h
Wind13 km/h / 8 mph
Air quality (US AQI)41🍃 good

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

Crowds in Koh Rong in May

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.

Shoulder seasonschool holidays in 2 of the markets that fill it, an ordinary month(estimated)

JFMAMJJASOND

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).

Fair weatherKoh Rong's weather peaks December–February.

JFMAMJJASOND

Best weatherFair weatherToughest weather

What's on in Koh Rong in May

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

  • Season

    Wet season

    MonsoonRisk

    29 rainy days and about 337 mm in the month — the real kind of rainy season, not afternoon showers.

    from the climate normals

What's on around the world in May →

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 May — FAQ

Is May a good time to visit Koh Rong?
May in Koh Rong: sweltering, soaked, with clean air — a gamble, with 29 rainy days. It ranks #7 of 12 months for Koh Rong on SeasonMap's comfort score (63/100).
What is the weather like in Koh Rong in May?
In May, Koh Rong averages a daily high of 31°C and a low of 27°C, with about 336.7 mm of rain over roughly 28.6 rainy days.
What is the air quality in Koh Rong in May?
Koh Rong has a mean US Air Quality Index of about 41 in May.

Within 300 km: Phu Quoc's Phu Quoc visa exemption on 1 Jan – 31 Dec.