Best time to visit Thailand

When to go

For most trips, the best time to visit Thailand is the cool season, and the right coast matters as much as the month.

Thailand has three seasons: cool from November to February, hot from March to May, and rainy from June to October.

The islands run on their own clock, because the two coasts get their rain at different times of year.

So the best month depends on where you're going: pick the coast first, then the month.

Ask Tanner which coast fits your dates.

The three seasons

The Thai Meteorological Department splits the year into three seasons: cool from mid-October to mid-February, hot from mid-February to mid-May, and rainy from mid-May to mid-October (checked November 2026).

In the cool season, Bangkok averages 32°C by day and 23°C at night in December, and Chiang Mai drops to 17°C after dark.

The hot season, March to May, peaks in April, when Bangkok averages highs of 36°C.

The rainy season, June to October, brings afternoon rain of one to three hours rather than all-day rain, with dry mornings and clear evenings.

For divers, the Similan Islands open only from mid-October to mid-May.

Plan around the heat in April and the afternoon rain from June.

The figures are 1991–2020 averages. Ask Tanner to plan the days around the heat.

Thailand weather by month

The weather changes with the coast, so here's each month, with the best place to be and the big dates.

Every date below is on our Thailand party calendar, checked against the official holidays.

Each month has its own guide: January, February, March, April, May, June, July, August, September, October, November and December.

Ask Tanner which week is still free on your coast.

For the beaches

November to April on the Andaman coast, January to August on the Gulf islands.

Phuket, Krabi and Koh Phi Phi are best from November to April, with calm seas and the best yacht days. May to October is the rainy season there, so plan fewer boat days.

In Phuket, the Thai Meteorological Department's 1991–2020 station averages show February is the driest month, with about 24 mm of rain, and September the wettest, with about 350 mm (checked November 2026).

Koh Samui, Koh Phangan and Koh Tao are best from January to August. Samui's rainy season runs from October to December, and November is the wettest month.

Tanner's tip: in November, Phuket is drying out while Samui gets its heaviest rain, so pick Phuket that month and save Samui for the new year.

The summer trick: in July or August, go to the Gulf islands while Phuket is wet. See our best beaches in Thailand.

Ask Tanner which island suits your month.

For a party trip

December: the best weather and the biggest dates of the year in one month.

Villas and yachts for those weeks go first. See Tomorrowland Thailand and Thailand in December, and ask Tanner to hold yours.

Outside December, the Full Moon Party on Koh Phangan runs every month, with 24 November next. Ask Tanner to fit one in.

For the festivals

April or November: Songkran and Loy Krathong.

Songkran, the Thai New Year, runs from 13 to 15 April 2027, and turns the whole country into a three-day water fight.

Loy Krathong falls on 24 November 2026, when candlelit floats go out on the rivers. In Chiang Mai, Yi Peng runs from 23 to 25 November, with sky lanterns only on the 24th and 25th, in permitted areas, the Chiang Mai Office of Tourism and Sports says (checked November 2026). The big mass release at CAD Khomloy is a separate ticketed event.

Book festival weeks three to six months ahead, because hotels fill fast.

Ask Tanner to hold a villa for festival week.

The cheapest time

The cheapest time to visit Thailand is the rainy season, June to October: hotels and villas drop their prices and the crowds thin out.

In the low season, hotels often cut their prices close to the date.

May and June are the best value: the rains are only starting, and prices are far below December.

The shoulder months, late October to early December and May to early June, give you good weather with fewer crowds.

December and January are the most expensive months.

For a group, a full party week for 12 starts from about ฿300,000. See what a Thailand trip costs, and ask Tanner to price your month.

Is the rainy season a bad time?

No, as long as you pick the right coast.

Most rain falls in the afternoon, so mornings are good for the beach or a boat. The landscape is green, the waterfalls are full and prices are low.

On the Andaman side, rough seas can cancel island boats in the monsoon, so keep a spare day for the boat trip.

In the rainy season, base the trip on the Gulf islands or in Bangkok, where the clubs don't care about the weather.

See the Thailand rainy season guide for the coast-by-coast detail.

Ask Tanner for a rainy-season plan that still feels like summer.

When not to go

The worst time to visit Thailand depends on the coast: skip the Andaman side in September and October if the beach and the boat are the point, and the Gulf islands in November.

Avoid Chiang Mai and the north in March and April, the Chiang Mai burning season, when smoke from field and forest fires fills the air.

On the five Buddhist holy days, shops stop selling alcohol, but licensed hotels, international airport terminals and licensed entertainment places can still serve, under the Office of the Prime Minister's notice (checked November 2026). We check the dates against your trip and plan around them.

Every month has somewhere good. Match the month to the coast, and check the nightlife laws for the dry days.

Ask Tanner to steer your dates around the dry days.

City by city

Each party city follows its own coast and calendar.

Here is the weather month by month for each region, from the Thai Meteorological Department's seasons and station averages.

Bangkok: November to February for the coolest evenings. The clubs and rooftops run all year.

Phuket: November to April for the beaches and yachts, with EDC Thailand in December.

Pattaya: November to April, with Tomorrowland in December and pool villas all year.

Koh Samui and Koh Phangan: January to August, with a Full Moon Party every month.

Chiang Mai: November to February, with Loy Krathong and Yi Peng in November. Pick your city on our Bangkok, Phuket, Pattaya and Koh Samui guides.

Ask Tanner which city fits your month.

Is 7 days enough for Thailand?

Yes, if you pick one city and one island.

A week covers two or three evenings in Bangkok and four days on Phuket or Samui. Bangkok and Pattaya together work too, about two hours apart by road.

For more stops, take ten days, because each flight between coasts costs most of a day.

Pick the two places first, then fit the parties around them.

For day-by-day routes, see our Thailand itinerary, and where to go in Thailand to pick the places.

Ask Tanner to split the week between two places.

Which month for your group?

The best month to visit Thailand for a group: December for the parties, February for the weather, June for the price.

December: the festival month, at peak prices.

February: one of the driest months, and a calm one for yacht days.

April: Songkran, if the group wants the water fight.

June to August: the Gulf islands at low-season prices.

November: cool weather, Loy Krathong and a Full Moon, before the December rush.

Ask Tanner to hold the month you pick.

Best time to visit Thailand in short

• Best overall: November to February, cool, dry and sunny almost everywhere.

• Andaman beaches: Phuket, Krabi and Phi Phi from November to April.
• Gulf islands: Koh Samui, Koh Phangan and Koh Tao from January to August.
• Party month: December, with Tomorrowland, EDC and New Year's Eve.
• Festivals: Loy Krathong on 24 November 2026, Songkran from 13 to 15 April 2027.
• Cheapest: June to October, the rainy season, with afternoon showers.

Checked November 2026. Tanner's pick for a first trip: late November, cool and dry, with Loy Krathong and a Full Moon on the same night.

Next: lock your dates

Lock your dates, then book the villa and the yacht before anything else.

The best villas and boats for December and Songkran go months ahead. Check the Thailand party calendar for every date, and the visa and arrival card rules before you fly.

Plan it with Tanner, and he sends back the best weeks for your group.