Phuket season guide: best months, weather and calm seas

When is high season in Phuket?

High season in Phuket runs roughly from November to April, with dry weather, sunshine and calm water. December, January and February are usually the most reliable months, with little rain and island trips running nearly every day.

March and April stay dry but get hotter. April is generally Thailand's hottest month, and it's also Songkran, the Thai New Year, celebrated with street water fights from 13 to 15 April. Great fun if you're in the mood. Less fun if you were planning a quiet lunch in a linen shirt.

The catch is obvious: everyone comes at once. Villas, yachts and helicopter slots around Christmas, New Year and Chinese New Year go early, so book those dates well ahead.

Is the rainy season in Phuket worth it?

Low season runs roughly from May to October, under the southwest monsoon. It's worth it if you know what you're signing up for: rain usually comes in short, heavy bursts rather than all-day drizzle, but the west coast can get big surf.

September is usually the wettest month. A typical day: sunny morning, a downpour for an hour or two in the afternoon, dry again by dinner. The water is warm all year, so the question isn't whether you'll be cold. It's whether the lifeguards will let you swim.

The upside is real too. Fewer people, a greener island, quieter restaurants and an easier time getting the villa or boat you want on the date you want. For a long stay, these may well be the best months on the island.

Which side of Phuket is best in the rainy season?

In the rainy season the east side of Phuket and anything facing Phang Nga Bay is calmer. The west coast (Patong, Karon, Kata, Kamala, Surin, Bang Tao) faces the monsoon directly and takes most of the swell.

Phang Nga Bay is sheltered from the open sea, so boat trips to its limestone karsts, James Bond Island and Koh Yao keep running through summer when the west coast is rough. The south, Rawai and Nai Harn, sits somewhere in between: the beaches still catch the swell, but the piers at Chalong and Rawai operate all year.

If you're staying long in low season, look past the beach in front of the villa and check how far it is to the east-side piers. Our guide to Phuket villa areas covers each neighbourhood.

When is the best time for Phi Phi, Similan and Racha?

November to April is the best window for the open-sea islands. Crossings to Phi Phi, Racha and the Similan Islands are smoother and more predictable in these months.

• The Similan Islands close to visitors every year from roughly mid-May to mid-October. In 2026 the national park reopened on 15 October, so the new season has already started.
• Maya Bay on Phi Phi has been closed for rehabilitation in recent years for roughly August and September. Phi Phi itself stays open; check the bay closure dates before you go.
• Racha and Coral Island are closer to Phuket and boats go there in summer as well, but a speedboat crossing in swell is a bumpy ride.
• Phang Nga Bay and Koh Yao work all year and are the safest bet in the rainy season.

Routes and travel times for each island are in where to sail from Phuket. Still choosing the boat itself? Read the Phuket yacht charter guide.

What to do in Phuket in low season?

Low season favours land trips and the sheltered bay. A private tour with a driver to the Big Buddha, Wat Chalong and Old Town doesn't care about swell, and you can wait out a downpour in a cafe.

Option two is Phang Nga Bay by catamaran or motor yacht. Option three, if you want the whole picture without the roll, is a helicopter: flights over the bay depend on visibility, so they get booked into a clear window rather than a fixed hour. Details in our helicopter tour guide.

At Siam Luxury Adventure we plan these days around the forecast. If the west coast is choppy in the morning, your manager will suggest moving the yacht to the bay or swapping it for an island tour. Here are the private tours in the catalogue today.

Which festivals should you plan around?

The dates that matter most: Christmas and New Year plus Chinese New Year (peak demand), Songkran in mid-April, and the Phuket Vegetarian Festival in Phuket Town, held in the ninth lunar month, usually September or October.

The Vegetarian Festival is not for the squeamish: processions, firecrackers, pierced cheeks. Its dates move every year with the lunar calendar, so check the schedule before you travel. Loy Krathong, usually in November, is gentler, with candlelit floats on the water, and works fine with kids.

Planning around specific dates? Message a Siam Luxury Adventure manager on WhatsApp or Telegram. We will tell you what the weather realistically allows and match a yacht, villa or private tour to your season.