Thailand weather by month: compare regions

Compare your travel month across Bangkok, northern Thailand, the Andaman coast and the lower Gulf. Then check a forecast for your actual places and dates.

Choose the right weather information

Climate planning is not a trip forecast
Information	Use it for
Climate normals	Comparing regions and typical seasons; not predicting your dates
Monthly / three-month outlook	Broad seasonal tendencies; check the publication period
Daily / seven-day forecast	Your places and approaching travel dates
Warning / marine forecast	Whether severe weather or sea conditions require a change now

TMD forecast choices TMD warnings and seasonal outlooks TMD shipping forecast

Typical patterns across the year

A qualitative planning summary, not measured rainfall for your trip. Monsoon timing varies. Northern air quality needs a separate check even in a dry month.

Typical regional patterns — check the forecast before travel
Month	Bangkok / central	North	Andaman	Lower Gulf
January	Drier	Cooler	Drier	Rain possible
February	Warming	Warming	Drier	Drier
March	Hot	Hot	Hot	Hot
April	Hot; storms	Hot; storms	Hot; storms	Hot
May	Rain increases	Rain increases	Rain increases	Showers
June	Rainy	Rainy	Rainy	Showers
July	Rainy	Rainy	Rainy	Showers
August	Wet	Wet	Wet	Showers
September	Wet	Wet	Wet	Showers
October	Transition	Transition	Transition	Rain increases
November	Drier	Cooler	Improving	Rainy
December	Drier	Cooler	Drier	Rainy

The two southern coasts can differ sharply late in the year. Use current northern-air checks alongside the weather calendar.

Open the month you are planning

This twelve-month index leads to the detailed destination guide for each month. Use it for a route hypothesis, then check the official forecast, marine conditions and air quality for your dates.

JanuaryCompare cool-season routes and both coasts FebruaryCompare the north with smoke risk MarchHeat and northern-air checks matter AprilHeat, Songkran and local forecasts MayMonsoon transition and flexible plans JuneCompare inland rain and coast options JulyRain-aware routes and sea checks AugustRegional rain and indoor fallbacks SeptemberUpper-country and Andaman rain checks OctoberChanging monsoon patterns by region NovemberUpper-country and lower-Gulf split DecemberCooler routes; check the lower Gulf

TMD 30-year climate charts Official daily forecast Check smoke and air quality

Choose the coast; check northern air separately

Phuket and Krabi face the Andaman Sea. Samui and Phangan are in the Gulf. Late-year rain can affect the lower Gulf while the Andaman improves. A good national weather summary cannot settle a particular sailing.

In the north, dry weather can coincide with smoke. Use the Air4Thai checks before outdoor plans. For rain-sensitive routes, see rainy-season planning.

Sources checked 8 October 2026. Confirm changing details for your travel date.

Useful links and sources

Tmd.go.th Tourismthailand.org Thai.tourismthailand.org Air4thai.pcd.go.th Direct source actions Direct source actions