Sihanoukville weather in January
January in Sihanoukville: sweltering, a little rain — one of the best months to visit.
Updated September 2026 · climate normals from ERA5 reanalysis
#1 of 12 months in Sihanoukville · #80 of 1413 destinations to visit in January · comfort 92/100 (tier S)
- Days
- 30°C
- Nights
- 25°C
- Wet days
- 9
- Sun
- 10.2 h
- Humidity
- 73%
- Daylight
- 12 h

Traveller notes on Sihanoukville in January
Notes from nearby Phu Quoc (65 km away)
Sihanoukville 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.
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.
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.
Add your own note from Sihanoukville's card on the map.
Sihanoukville climate normals — January
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Sihanoukville 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.
BusyDry season, school holidays in 6 of the markets that fill it(estimated)
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).
Best weatherSihanoukville's weather peaks December–February, best around January.
Best weatherFair weatherToughest weather
What's on in Sihanoukville in January
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Dry season
15 Nov – 30 Apr · usuallyCrowdedCalm 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.
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?
Sihanoukville in January — FAQ
- Is January a good time to visit Sihanoukville?
- January in Sihanoukville: sweltering, a little rain — one of the best months to visit. It ranks #1 of 12 months for Sihanoukville on SeasonMap's comfort score (92/100).
- What is the weather like in Sihanoukville in January?
- In January, Sihanoukville averages a daily high of 29.6°C and a low of 24.6°C, with about 53.5 mm of rain over roughly 8.8 rainy days.
- What is the air quality in Sihanoukville in January?
- Sihanoukville has a mean US Air Quality Index of about 55 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.