Best Time to Visit Thailand

Thailand has no single best month, because the country sits between two seas and each coast has its own rainy period. Bangkok, the north and the Andaman coast, with Phuket and Krabi, share a cooler, drier window from November to February. The Gulf of Thailand side, with Koh Samui, follows a different pattern. This guide explains the seasons, gives a month-by-month list and shows how to choose by region. Weather figures come from our destination research, so check a forecast before you fly.

Thailand weather at a glance

• November to February: cooler, drier and most comfortable for most regions; peak season from December.
• March to April: hot, with highs of 34°C to 35°C; April brings Songkran.
• May to October: wetter, with showers most days in many areas.
• September: among the wettest months, with lowest-season pricing in many areas.
• Gulf islands: often drier from January to August.

What is the best time to visit Thailand overall?

For most of Thailand, the best overall time is November to February. Conditions are generally cooler and drier, and sightseeing in Bangkok and the north is easier. January and February are warm and relatively dry, with highs of about 32°C to 33°C. December has the least rain of the year at about 10 mm, but it is also the peak month, especially over Christmas and New Year. If you can travel in November or early December, you get good weather with slightly less pressure on hotels.

Which month suits the Andaman coast?

The Andaman coast, with Phuket, Krabi and Koh Phi Phi, is generally best from November to February, and December to January is often the clearest window. November is very good, though some rain remains possible. October is a transition month with rain, especially on this coast. From May to September showers increase, sea conditions can change and some boat services reduce. Weather can cancel longtail-boat excursions, so keep one flexible day in your plan.

Which month suits the Gulf islands?

Koh Samui and the Gulf islands, including Koh Phangan and Koh Tao, often have their drier period from January to August. Some sources highlight January to mid-March as especially good. This means Koh Samui can be a better beach choice than the Andaman coast in June, July and August. The Gulf coast may still be wet in November. Check ferry conditions before adding Koh Tao or Koh Phangan.

What about Bangkok and Chiang Mai?

Bangkok is most comfortable from November to February. March and April turn very hot, and the wet season brings regular showers from May to October. Chiang Mai follows a similar pattern, with one extra point: severe burning-season haze can affect visibility and air quality from roughly February to April. Avoid outdoor northern plans in those weeks if you can.

Thailand month by month

• January: 21°C to 32°C, about 13 mm of rain. Excellent for sightseeing and beaches; peak season.
• February: 23°C to 33°C, about 20 mm. Warm, relatively dry and peak season.
• March: 25°C to 34°C, about 40 mm. Good for beaches, increasingly hot.
• April: 27°C to 35°C, about 72 mm. Very hot; Songkran brings major celebrations and domestic demand.
• May: 27°C to 34°C, about 155 mm. Hot and wetter; prices drop but showers increase.
• June: 27°C to 33°C, about 155 mm. Monsoon showers; the Gulf coast can stay suitable.
• July: 26°C to 33°C, about 155 mm. Wet-season conditions; keep plans flexible.
• August: 26°C to 33°C, about 170 mm. Frequent showers; Gulf islands are often better than the Andaman coast.
• September: 25°C to 32°C, about 220 mm. One of the wettest months; lowest-season pricing.
• October: 25°C to 32°C, about 190 mm. Transition month; rain remains possible, especially on the Andaman coast.
• November: 24°C to 32°C, about 40 mm. Very good for Bangkok, the north and the Andaman coast.
• December: 21°C to 31°C, about 10 mm. Excellent weather and peak demand.

Read each month in detail: January, April, July, September and December are good starting points.

When is peak season and when is it cheaper?

December to February, and especially the Christmas and New Year period, command the strongest demand. Songkran in April also increases domestic travel and hotel pressure. May to October is cheaper, with September the lowest-season month in many areas. Travelling outside Christmas and New Year, and booking flights and hotels early for peak months, helps control the budget. See Thailand trip cost.

Which month suits which traveller?

• First-timers and sightseers: November to February.
• Families: November to March, with short transfers and shaded plans.
• Honeymooners: November to February.
• Budget travellers: May to October, with flexible plans and the right coast.
• Festival fans: April for Songkran.
• Gulf beach seekers: January to August on Koh Samui.

What should you pack and plan by season?

In the cool season, pack light cotton, one warmer layer for northern evenings and sun protection. In the hot months, plan temple visits in the morning and keep the afternoon for rest. In the wet season, carry a light rain jacket, keep boat trips flexible and ask for refundable or flexible boat components. Mosquito-borne diseases have more cases in the rainy season, so use insect repellent. Dress for temples with covered shoulders and knees in every season.

How was this guide compiled?

This guide is compiled from published tourism, weather and transport information and traveller reports about Thailand, and was last checked on 2 November 2026. Weather varies year to year, so confirm forecasts and boat schedules before you book.

Where to go next

Return to the Thailand travel guide, see places to visit in Thailand and things to do in Thailand, and browse our Thailand tour packages. The Phuket Krabi Island Escape 5N package suits the Andaman season.