What you need to know
What has changed
Thailand’s cool season began on Monday, 9 November, the Thai Meteorological Department announced. Forecasters expect it to last until around late February 2027 and to be milder than last year. January is expected to bring the lowest temperatures, particularly in the North and Northeast.
Cooler mornings in upper Thailand
The start of the season marks a change in wind and weather patterns. Its effects will vary across the country, and a cool morning can still be followed by a warm afternoon. The weather agency expects the colder spells to be most noticeable in northern and northeastern Thailand. Bangkok and other parts of central Thailand may also see some cooler mornings.
If your plans involve a dawn departure, a motorcycle ride or time in the northern hills, pack a layer you can take off later. Check the forecast for your actual destination: conditions on an exposed ridge or at higher elevation can differ from those in a nearby town. The seasonal outlook gives a broad guide, so use the daily forecast for decisions about what to wear and when to set out.
The South still has a different outlook
The department expects rain to continue in the South, especially on its Gulf-facing side. Its seasonal outlook says strong low-pressure systems or tropical cyclones could approach the Gulf of Thailand and southern Thailand during November or December, potentially bringing heavy rain, rough seas or coastal surges. That is a seasonal risk; consult current warnings for any specific system or location.
For a southern beach or island trip, check local weather and marine notices close to departure. Conditions and ferry arrangements can vary by route, so check with your operator if a warning covers the waters you will cross.
