Sihanoukville weather in May

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

Updated September 2026 · climate normals from ERA5 reanalysis

Sihanoukville🇰🇭 Cambodia · Southern Vietnam & Cambodia · Beach63
  1. 92Jan
  2. 90Feb
  3. 85Mar
  4. 78Apr
  5. 63May
  6. 61Jun
  7. 56Jul
  8. 60Aug
  9. 53Sep
  10. 57Oct
  11. 74Nov
  12. 87Dec

#7 of 12 months in Sihanoukville · #1135 of 1413 destinations to visit in May · comfort 63/100 (tier C)

Days
30°C
Nights
27°C
Wet days
29
Sun
9.4 h
Humidity
82%
Daylight
13 h
Sihanoukville, Cambodia
Photo: Him Sann TR · Pexels

Traveller notes on Sihanoukville in May

Other months in Sihanoukville

Sihanoukville forum regulars describe August as genuine monsoon season, with rain that can hit overnight, early morning or mid-afternoon and, when it does, comes down hard for roughly an hour before clearing. One traveler who spent two weeks there in August said it only rained a handful of times, always torrential but brief, and had more sunny days than wet ones overall. The bigger risk isn't the rain itself but rougher seas - a few posters mentioned island boat trips to Koh Rong getting cancelled on choppy days, so it's worth building a spare day into any island-hopping plan.
KohRongIslandHopper · August · 1 month ago · Read more on Tripadvisor ↗
Forum posters describe February as comfortably inside Cambodia's dry season, with beaches around Sihanoukville generally clean and calm this time of year. Posters are candid, though, that the country's tropical climate means even peak dry season isn't fully rain-free - localized afternoon or evening showers and brief thunderstorms remain possible, following a common daily pattern of a sunny morning giving way to clouding and rain later in the day. Posters treat this as a minor, short-lived interruption rather than a reason to avoid the period, with February still ranking among the better months for beach time on this coast.
Tripadvisor community · February · 1 month ago · Read more on Tripadvisor ↗

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

Sihanoukville climate normals — May

Daytime high30°C / 87°F🔥 sweltering
Nighttime low27°C / 80°F
Feels like (high)37°C / 99°F
Sea temperature32°C / 89°F♨️ bath-warm
Rainfall345 mm / 13.6 in⛈ soaked
Rainy days29 days
Humidity82%💦 very humid
Dew point25°C / 77°F
Sunshine9.4 h/day
Daylight12.6 h
Wind10 km/h / 6 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 Sihanoukville 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 Sihanoukville'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 weatherSihanoukville's weather peaks December–February, best around January.

JFMAMJJASOND

Best weatherFair weatherToughest weather

What's on in Sihanoukville in May

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

  • Season

    Wet season

    MonsoonRisk

    29 rainy days and about 345 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 Sihanoukville — a day trip or a short hop — with something on this month. Never part of the comfort score.

Where is Sihanoukville?

Loading map…

Sihanoukville in May — FAQ

Is May a good time to visit Sihanoukville?
May in Sihanoukville: sweltering, soaked, with clean air — a gamble, with 29 rainy days. It ranks #7 of 12 months for Sihanoukville on SeasonMap's comfort score (63/100).
What is the weather like in Sihanoukville in May?
In May, Sihanoukville averages a daily high of 30.3°C and a low of 26.6°C, with about 344.9 mm of rain over roughly 29.3 rainy days.
What is the air quality in Sihanoukville in May?
Sihanoukville 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.