No single month is universally "good" for sailing across all of Asia. The region's weather is driven by the northeast and southwest monsoon cycles, the Pacific typhoon belt, and the Bay of Bengal cyclone system — three distinct meteorological forces that affect different parts of the region at different times. Understanding this seasonal matrix is essential for planning your itinerary and for understanding the insurance implications of where you are when.
The pattern is not random. There is a logical, predictable sequence to Asian sailing seasons that allows a well-planned itinerary to be in good conditions almost everywhere, almost all the time — if you move with the seasons rather than against them.
The Two Monsoon Systems
Almost everything in Asian sailing weather comes down to two monsoon systems:
Northeast monsoon (NEM) — approximately November to March: Brings dry, settled conditions with consistent 10–20 knot winds from the northeast. This is the best season for: Thailand's Andaman Sea, Malaysia/Langkawi, Malaysia's east coast (south of the main NEM swell belt), Maldives, Sri Lanka's south coast, and India's southwest coast.
Southwest monsoon (SWM) — approximately May to October: Brings wet, more volatile conditions from the southwest. This is the best season for: Indonesia (Bali to Raja Ampat), the Thailand/Langkawi transition (briefly, in April–May), and parts of the Philippines' western coast.
The transition months (April and October) are the most complex — conditions are changeable as the monsoon systems reverse direction.
Month by Month: Where to Sail
November **Thailand Andaman (Phuket, Phang Nga, Krabi, Similan Islands)**: Excellent. NEM arriving; typically settled with 10–15 knots. The season's best diving visibility returns with the NEM. King's Cup Regatta at Phuket. **Insurance note**: Named Storm risk drops sharply but confirm Named Storm position on your policy.
Malaysia / Langkawi: Excellent. Fuel up at duty-free Langkawi and begin the season. Langkawi International Royal Regatta typically mid-November.
Philippines (Palawan, Visayas): Good. Amihan (northeast monsoon) establishing. November sees the tail end of typhoon season — Named Storm cover still important.
Maldives: Excellent. NEM provides ideal sailing conditions in the outer atolls.
December **Thailand**: Best month. Perfect NEM conditions across Andaman Sea and Gulf of Thailand. Phuket is at its most crowded with boats.
Malaysia: Excellent on west coast. East coast Malaysia (Tioman, Perhentians) is rough — South China Sea northeast swell closes the east coast for the season.
Maldives: Ideal. Settled seas, excellent visibility, calm anchorages.
Sri Lanka (Galle): Season opens. The sailing community gathers at Galle. SLPA clearance straightforward.
Indonesia (Bali): Transitional. Northwest monsoon arriving — conditions less reliable than the SE monsoon season. Most Indonesia-experienced sailors avoid December–February.
Philippines: Safe season in full swing. December is excellent for Palawan and the Visayas.
January–February **Thailand / Malaysia**: Peak of NEM season. The most popular months in Phuket and Langkawi. Perfect sailing for island-hopping.
Maldives: Ideal. Outer atoll sailing with consistent NEM. February is the driest month.
India (Goa, Cochin): Good sailing conditions on the west coast. India needs advance permit preparation — PANS notification 96 hours before arrival.
Sri Lanka: Good on south coast. Trincomalee (northeast coast) rough.
Philippines: Best months for Palawan and Visayas. Far less typhoon risk. January–April represents the widest, clearest sailing window.
Indonesia: Northwest monsoon. Bali anchorages less settled. Raja Ampat is accessible but with less reliable conditions than the SE monsoon season.
March **Thailand / Malaysia**: NEM starting to ease. Late March can see lighter, more variable winds. Still excellent sailing in Phang Nga Bay and the Similan Islands.
Maldives: Still good but NE monoon weakening. Some of the best whale shark encounters occur in the outer atolls in March.
India / Sri Lanka: Good on both coasts. Indian Ocean Race Week events typically March–April.
Indonesia: Conditions improving as NW monsoon retreats. March is the beginning of the transition toward SE monsoon conditions. Some sailors start the Bali-to-Komodo passage in March.
Philippines: Still the safe season. Tubbataha Reef liveaboard season opens (March–June permit window, limited allocations).
April **Transitional month across the region**. NEM retreating, SWM approaching.
Thailand Andaman: Still passable early April; deteriorating late April. Most Phuket-based boats are completing their season's final passages.
Indonesia: SE monsoon arriving from south — excellent conditions building in Bali, Lombok, and Komodo. April is a good time to start the Indonesia circuit.
India (Andaman & Nicobar): Bay of Bengal cyclone season begins. Little Andaman Pro 2026 was held in April — the edge of the safe window. Insurance note: Bay of Bengal Named Storm cover becomes important from April.
Maldives: SW monsoon approaching but April still generally good.
May **Indonesia**: Excellent. SE monsoon providing ideal 15–25 knot conditions for the Bali-Komodo passage and the Flores Sea.
Thailand Andaman: SWM beginning. Conditions deteriorating — Phuket boats now in marina for the season or heading to Langkawi.
Philippines: Typhoon season beginning. Most experienced sailors depart Palawan by mid-May. Insurance note: Named Storm cover essential from May.
Myanmar (Mergui Archipelago): Season ending. Last boats departing for Thailand before the SWM makes the Andaman coast untenable.
June–August **Indonesia (SE monsoon peak)**: The best months for Indonesia. Bali to Raja Ampat passage in excellent conditions — 20–30 knots SE, consistent swell, excellent visibility for diving. Phuket Raceweek in July for boats returning to Thailand.
Philippines: Peak typhoon season. Insurance note: No yacht without comprehensive Named Storm cover should be in Philippine waters August–October.
Vietnam: Typhoon season — South China Sea typhoons strike the central coast. Insurance note: Named Storm cover essential.
Thailand Andaman: Southwest monsoon. Phuket marinas open for cyclone haul-out. Not recommended for passage sailing.
India: SWM on both coasts. Rough conditions.
September–October **Indonesia (transitioning)**: SE monsoon retreating, NW monsoon approaching. Conditions becoming less reliable in October. Most boats completing their Indonesia season.
Philippines: Peak typhoon season in September. October is transition — still significant risk. Named Storm cover essential through October.
Thailand Andaman: October sees the NEM arriving — the Similan Islands liveaboard season begins late October.
Myanmar / Mergui: New season beginning late October as NEM arrives.
Bay of Bengal: Post-monsoon cyclone season active — India and Sri Lanka at risk October to December. Insurance note: Review Named Storm position for Indian Ocean passages.
Insurance Implications of Seasonal Sailing
Understanding the seasonal matrix has direct insurance consequences:
Named Storm exclusion periods: Some policies include navigation warranties tied to seasonal risk windows. Sailing in the Philippines between June and November, or in the Bay of Bengal between October and December, without Named Storm cover can mean your policy excludes precisely the most dangerous events you face.
Lay-up period credits: If your vessel is hauled out during the SWM in Thailand (May to October), declaring a lay-up period in your insurance policy earns a premium credit — typically 10–20% of the annual premium — for the months the vessel is ashore and not at risk.
Named Storm endorsement conditions: Most Named Storm endorsements specify the vessel must be in a recognised safe berth, hauled out, or outside the typhoon belt during storm warnings. Confirm your specific endorsement conditions match your operational reality — a vessel at anchor in an open bay during a Named Storm warning may not qualify for the endorsement's protection.
Green card for passage: Vessels crossing between countries — Thailand to Malaysia, Indonesia to Australia — need to confirm their policy covers all countries in the itinerary, not just the start and end points. The EEZ of each country is crossed during a passage and is a separate insurance territory.
The seasonal pattern in Asia is actually a gift for the well-organised sailor: there is almost always a "best place" to be at any given time of year. The insurance challenge is ensuring your policy covers that place, at that time, with the specific endorsements the local conditions require.
Contact us to arrange yacht insurance that follows your planned itinerary across the seasons — a single international policy covering all your destinations, with Named Storm cover calibrated to your specific sailing calendar.
