When is the best time to visit Sihanoukville?

Dry Season: Calm Seas and Sunshine (November to April)

The best time to visit Sihanoukville is between November and April, when dry northeast winds bring clear skies and calm waters along the Gulf of Thailand. November through February brings the most comfortable weather, with moderate heat and low humidity. This window is ideal for beach lounging and smooth ferry crossings from the mainland piers to Koh Rong and Koh Rong Sanloem.

March and April remain dry, but temperatures surge significantly. Sea conditions stay placid for swimming and island hopping, though midday heat requires loose clothing and sun protection.

Monsoon Season: Choppy Waters and Rain (May to October)

The southwest monsoon brings heavy afternoon rain and high humidity from May to October, with rainfall peaking between July and September. While coastal showers are often brief early in the season, late monsoon storms generate rough ocean swells. Speedboat transfers to the islands face frequent delays or safety cancellations. Travelers visiting primarily for island beaches should avoid the wettest months.

Peak Periods and Availability

• Khmer New Year (Mid-April): Domestic travel surges, filling coastal transit routes and beachfront accommodations.
• December to January: Peak international arrivals bring crowded ferry terminals at Sihanoukville Autonomous Port.
• Pchum Ben (September or October): A major religious holiday where transport availability fluctuates.

What to Pack

For dry-season trips, bring breathable clothing, reef-safe sunscreen, a wide-brimmed hat, and dry bags to safeguard electronics during boat transfers. If traveling in the shoulder or wet months, carry sturdy waterproof footwear, a lightweight rain jacket, and motion-sickness remedies for rough sea journeys.