Sihanoukville weather in April

April in Sihanoukville: sweltering, soaked, with muggy air — fine if you can take 21 rainy days.

Updated September 2026 · climate normals from ERA5 reanalysis

Sihanoukville🇰🇭 Cambodia · Southern Vietnam & Cambodia · Beach78
  1. 92Jan
  2. 90Feb
  3. 85Mar
  4. 78Apr
  5. 63May
  6. 61Jun
  7. 56Jul
  8. 60Aug
  9. 53Sep
  10. 57Oct
  11. 74Nov
  12. 87Dec

#5 of 12 months in Sihanoukville · #760 of 1413 destinations to visit in April · comfort 78/100 (tier B)

Days
31°C
Nights
27°C
Wet days
21
Sun
10.9 h
Humidity
76%
Daylight
12 h
Sihanoukville, Cambodia
Photo: Him Sann TR · Pexels

Traveller notes on Sihanoukville in April

Notes from nearby Phu Quoc (65 km away)

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

Phu Quoc-forum threads on April weather describe it as sitting right at the edge of the low-rain season, still officially inside it but with humidity climbing and the occasional scattered storm creeping in as the wet season approaches. Posters are consistent that any given shower runs brief rather than disruptive, and the month keeps its reputation as pleasant for beach time - warm, sunny, with gentler crowds and prices than true peak season. The record actually runs wetter than most forum threads suggest for a nominally low-rain month, a reminder the wetter transition can arrive earlier in a given year than the calendar label implies. The record: 33C days feeling like a punishing 39C, 25.2C nights, a notably high 107mm across 18.4 days, 77 percent humidity, a 31.2C sea and 11.1 hours of sun.
LongBeachAprilRegular · April · 1 month ago · about Phu Quoc · Read more on Tripadvisor ↗

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 — April

Daytime high31°C / 88°F🔥 sweltering
Nighttime low27°C / 80°F
Feels like (high)38°C / 100°F
Sea temperature31°C / 88°F♨️ bath-warm
Rainfall160 mm / 6.3 in⛈ soaked
Rainy days21 days
Humidity76%💦 very humid
Dew point24°C / 75°F
Sunshine10.9 h/day
Daylight12.4 h
Wind9 km/h / 6 mph
Air quality (US AQI)56🙂 moderate

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

Crowds in Sihanoukville in April

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 crowdsKhmer New Year, Dry season, school holidays in 3 of the markets that fill it(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 April

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

  • Festival

    Khmer New Year

    13–16 AprWater-festival New YearCrowdedBook early

    The whole country comes to this coast for it. Ferries run full, the beach is wall-to-wall Cambodian families, and rooms cost what they never otherwise do. Source ↗

  • Season

    Dry season

    15 Nov – 30 Apr · usuallyCrowded

    Calm water and reliable crossings to Koh Rong and Koh Rong Sanloem, which is what most people are actually here for. The mainland beaches are a building site by comparison.

What's on around the world in April →

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?

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Sihanoukville in April — FAQ

Is April a good time to visit Sihanoukville?
April in Sihanoukville: sweltering, soaked, with muggy air — fine if you can take 21 rainy days. It ranks #5 of 12 months for Sihanoukville on SeasonMap's comfort score (78/100).
What is the weather like in Sihanoukville in April?
In April, Sihanoukville averages a daily high of 31.2°C and a low of 26.7°C, with about 160.3 mm of rain over roughly 21.4 rainy days.
What is the air quality in Sihanoukville in April?
Sihanoukville has a mean US Air Quality Index of about 56 in April.

Within 300 km: Phnom Penh's Khmer New Year on 13–16 Apr, and Phu Quoc's Dry season around 15 Nov – 30 Apr.