Sihanoukville sits on Cambodia's southern coast and runs on a tropical, two-season climate: a dry season that stretches roughly from November to April, and a wet (southwest monsoon) season from May to October. The temperature barely moves all year, hovering in the high 20s to low 30s Celsius (mid-80s to low 90s Fahrenheit), so your real decision is about rain, sea conditions, and how many other travelers you want to share the sand with.
The town itself has changed dramatically over the past decade, with heavy casino and construction development reshaping the waterfront. For most visitors the real draw now lies offshore: the ferry hop out to Koh Rong and Koh Rong Sanloem, where the beaches and clear water are far better than the mainland. That makes calm seas and reliable ferry schedules a big part of timing your trip.
If you want dependable sunshine, swimmable water, and easy island-hopping, aim for the dry months. If you want low prices and near-empty beaches and can tolerate downpours, the green, wet season has its own appeal.
The best time to visit Sihanoukville is the dry season from November to February, when rainfall is low, humidity eases, temperatures sit around 27-30C (81-86F), and the sea is calm enough for reliable ferries to Koh Rong and Koh Rong Sanloem. December and January are the sunniest but busiest; November and February offer nearly the same weather with thinner crowds.
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The short version
Through the year
This is the postcard version of Sihanoukville: blue skies, calm water, and reliable ferries to the islands. The trade-off is higher prices and more company on the sand. Book ahead if you are traveling over the December and January holidays.
Still mostly dry and great for the beach if you can handle the heat. Mornings and late afternoons are best for activity; midday sun is fierce. Avoid expecting a quiet trip during Khmer New Year, when the town fills with Cambodian holidaymakers.
The landscape is lush and green and prices are at their friendliest. Rain often comes in bursts rather than all-day, so you can still get beach time, but seas are choppier and some boat trips get canceled. Good for budget travelers who value space over guaranteed sun.
This is the gamble season: cheapest and emptiest, but you may lose days to storms and rough water that disrupt ferries. October sees the rain begin to taper. Best only for flexible travelers chasing value and solitude rather than a sun-certain beach holiday.
Notable events & festivals
Skip August to October if you want dependable beach weather: this is the peak of the monsoon, with the heaviest rain, rough seas, and ferry cancellations that can strand you off the islands. If you dislike crowds and high prices, avoid the Christmas-New Year window and Khmer New Year week in mid-April.
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Frequently asked questions
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Is December a good time to visit Sihanoukville?
Time it right and Sihanoukville is your launch pad to some of Southeast Asia's best-value island beaches. Target November to February for sun and calm seas, or roll the dice on the green months for low prices and empty sand. Either way, plan your island ferries around the season and book ahead over the holidays.
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