Rainy Season in Phuket – May to October

Rainy Season in Phuket

The rainy season in Phuket runs from May to October. Locals call it the monsoon or low season. After 30 years of living here, I can tell you that the name sounds worse than the reality. It does not rain every day, and when it does, showers are usually short and arrive in the afternoon or evening. Mornings are often sunny. The real question is not whether it will rain during your trip. It will, at some point. The question is whether the trade-offs are worth it. Lower hotel prices, empty beaches, less traffic, and a greener island. For many travellers, the answer is yes. For others who need guaranteed blue skies, December to March is a safer bet. Read more about Phuket weather.

What the Rainy Season Actually Looks Like

Most people imagine non-stop grey skies and constant downpours. That is not how it works. A typical rainy season day in Phuket starts with sunshine. Clouds build during the afternoon, and by 3 or 4 pm, you get a heavy tropical shower that lasts 30 minutes to two hours. Then it clears, and you often get a spectacular sunset with dramatic cloud formations. The exception is the “unlucky weeks.” Every rainy season, there are stretches of 3, 6, or even 9 days of continuous rain. Nobody can predict when they will happen. If your holiday falls during one of those weeks, you will need a backup plan. If it does not, you might get better weather than some people get in January. The island looks completely different during these months. Everything is green and lush after the first rains. The hills behind Kathu turn a deep tropical green that you never see during the dry season. I run around Bang Wad Reservoir regularly, and during the monsoon, it is full and beautiful, surrounded by green hills. By April, that same reservoir is mostly dry mud.

Month by Month During the Rainy Season

Not all rainy season months are the same. May feels nothing like September. Here is a realistic breakdown based on what I have seen over the years. May and June are transition months. The monsoon is arriving but has not fully settled in. You still get plenty of sunny days, and the rain is often light. Many people visit in May and June without any problems. Hotel prices drop, and beaches are noticeably quieter. The sea starts getting rougher on the west coast, but the east coast beaches stay calmer. July and August are wetter but still manageable. The monsoon is established, and you can expect rain on most days, but rarely all day. This is the period when surfing picks up on Kata Beach and Kalim Beach. The waves are not huge, but there are surf shops in Kata where you can learn. Tours to Phi Phi Islands and Phang Nga Bay still operate. Phang Nga Bay is actually more impressive with dramatic clouds above the limestone cliffs, and because the cliffs protect the bay, the water stays calm. September and October are the wettest months. If you have a choice of when to visit, these are the months I would avoid. Grey skies are more common, rain can last longer, and the sea is at its roughest. This is when the unlucky weeks tend to happen. But even in September, you can still get beautiful days. The Similan Islands are closed from mid-May to mid-October, so you cannot visit them during these months.

The Sea During the Rainy Season

This is the part that matters most. The sea temperature stays warm all year (29-30°C during the monsoon), but the west coast beaches get strong waves and dangerous riptides from May to October. You must respect the red flags. The undertow is powerful enough to pull experienced swimmers out to sea within seconds. Every year, people drown because they underestimate it. Patong, Kata, Karon, Surin, and Kamala all get rough during the monsoon. If swimming is important to you, there are a few options. Some beaches stay swimmable during the rainy season because they are more sheltered. East coast spots like Ao Po and Cape Panwa stay calmer. And booking a hotel with a great swimming pool is always a smart move. A beachfront hotel with a pool gives you the best of both worlds: enjoy the beach on calm days, swim in the pool when the sea is rough.

Flooding in Phuket

Phuket is a hilly island, so when it rains hard, water rushes down from the hills and collects in low-lying areas. Flash flooding happens a few times each rainy season, usually after several hours of continuous heavy rain. The water rises fast but also drains within a few hours once the rain stops. Some areas flood more often than others. Based on recent events (including a major flood in June 2024 that diverted 14 flights away from Phuket Airport), the most common flood-prone spots are the Kathu area (around Wat Kathu and the road near Loch Palm golf course), the low section of Patak Road near Kata, the road in front of Patong Hospital, the Cherngtalay road between Ban Kian junction and Blue Tree water park, and the Chalong area near the electricity authority curve. Some sections of the road to the airport also flood occasionally. For tourists, flooding is rarely dangerous. It is mostly an inconvenience that slows down traffic for a few hours. If you are driving or riding a motorbike during heavy rain, slow down and avoid low-lying underpasses. The water drains quickly once the rain stops.

What to Do When It Rains

Rainy days are a chance to explore things you might skip during perfect beach weather. Phuket Old Town is perfect on a cloudy or rainy day. The streets are beautiful, and there are plenty of cafes, shops, and restaurants in old heritage houses where you can take a break. Central Phuket and Jungceylon are popular for rainy afternoons. A spa treatment is another classic rainy day option. And the cooler temperatures actually make it more comfortable to walk around than in the scorching heat of March or April. All tours and attractions operate normally during the rainy season unless there is a serious storm, which is rare. Day trips to Phang Nga Bay run all year, and the scenery is more dramatic with heavy clouds. Phi Phi Islands are accessible year-round, though the boat ride can be rougher. For more ideas, read my full guide to Things to Do in Phuket When It Rains.

Hotel Prices During the Low Season

This is the biggest advantage of visiting during the monsoon. Hotel prices drop by 40-60% compared to peak season. A luxury resort that costs 15,000 baht per night in January might be 6,000-8,000 baht in July. Budget hotels that charge 2,000 baht in high season can drop to 800-1,000 baht. The savings are real and significant. If you are flexible with your dates and do not mind the occasional rainy afternoon, you can experience a much higher level of hotel than your budget would normally allow. Many travellers deliberately visit in May, June, or July for exactly this reason.

More About the Weather in Phuket