Weather windows

Southeast Asia Pilot – November 2025

Weather windows & monsoon seasons

Timing your voyages right

The joy of cruising Southeast Asia lies in its variety – remote islands, bustling ports, and year-round warmth. But that same tropical charm comes with a challenge: the region’s complex monsoon system. Knowing the weather, and therefore when and where to sail, can make the difference between an unforgettable season and an uncomfortable one.

Understanding the two monsoons

Southeast Asia experiences two dominant wind systems – the Northeast Monsoon (roughly November to April) and the Southwest Monsoon (May to October).
The northeast brings drier weather to Thailand, Malaysia’s west coast and the Andaman Sea, while Indonesia’s northern regions and the South China Sea get wetter conditions. The southwest flips that pattern – Thailand’s Andaman anchorages see swells and rain, while Indonesia’s southern cruising grounds shine under clear skies.

Timing voyages between regions

Many cruisers migrate seasonally: Thailand in the NE monsoon, Indonesia during the SW – and Malaysia as a transition or stopover. This rhythm lets you follow fair winds and calm seas while avoiding stormier months.

Localised variations

Coastal geography and mountain ranges mean wind and rain patterns can differ even within short distances. For example, Langkawi may bask in sunshine while Phuket gets drenched. Always check local forecasts before departure.

Essential tools

PredictWind, Windy, and local MET forecasts are invaluable – but so is local knowledge. Chatting with marina staff, fishermen, or other skippers often yields more accurate short-term insights than any app.

Final thought

Southeast Asia rewards patience. Wait for the right window, sail with the season, and you’ll find every passage smoother and safer.

Call to action

Plan smart, cruise safely – and let Southeast Asia Pilot be your guide to planning every voyage.

Definitive cruising guide

When planning your Southeast Asian cruising, don’t forget to get a copy of Southeast Asia Pilot. It remains the definitive cruising guide to all of Southeast Asia’s ocean wonderland. The book details 600+ anchorages with shoreside tips and other useful insights. It covers nine countries, from the Andaman Sea to the Spice Islands – with introductory notes on several more. Available now in print or as an interactive eBook.

⇒ ⇒ ⇒ Buy Southeast Asia Pilot

Southeast Asia Pilot and Phuket Publicity Services do their best to ensure that the information on this website is accurate. However, good seamanship demands that seafarers check critical information carefully with relevant sources to ensure it is up to date.Facebook