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Koh Samui Weather In April - Top Things To Do When It's Hot

Koh Samui (Ko Samui) is the second largest island in Thailand after Phuket and one of the most popular beach destinations in the country. Traveling to Koh Samui in April, you will discover a lively atmosphere, between strong tropical heat and a festive mood linked to Songkran. But how to organize your days under high temperatures? In this article, I give you real advice, useful information, and ideas for activities to do in Koh Samui when it's hot, adjust your schedule, and enjoy your stay fully despite the heat.

1. Koh Samui weather in April : hot, hot, hot!

Temperatures & rain in April

April is one of the hottest months in Koh Samui. Daytime high temperatures usually range between 32°C and 35°C. Combined with high humidity, they create a feeling of heat stronger than the numbers show. So, is April a good time to visit Koh Samui ? Luckily, yes. Although it’s one of the hottest months of the year, the island remains very enjoyable if you plan your days wisely. A light sea breeze in the late afternoon often brings welcome relief, making beach walks and sunset dinners much more comfortable. In the evening, temperatures drop to around 25–26°C, which is nice for eating outside or walking along the beach.

About the rain, April shows a slow increase in showers compared to earlier months. The data changes depending on the sources: the average monthly rainfall is between about 38 mm and 101 mm, with 6 to 12 rainy days in the month. However, these are mostly short and sudden tropical showers, followed quickly by the sun coming back.

Sea temperature

Good news for swimming fans: the sea temperature in Koh Samui in April reaches an average of 30°C. This warm water is perfect for swimming, snorkeling, or doing water sports without feeling cold.

In summary: hot days, a nicely warm sea, and a festive atmosphere. For those who like the sun and tropical feel, April is a really interesting time to visit Koh Samui.

2. Things to do in Koh Samui when it's hot

When temperatures rise in Koh Samui, the best is to mix swimming, nature, water activities, and breaks in the shade. Here is a selection of activities to choose to enjoy the island fully despite the heat.

Relax on the beaches and do snorkeling

Koh Samui has many dream beaches, and in April, the water is at a wonderful temperature (about 29°C) – perfect to cool down! Chaweng Beach attracts with its white sand and turquoise waters, great for swimming and exploring the sea floor near the shore. Lamai Beach, more peaceful, is perfect for those looking for a relaxed and shady atmosphere. When the heat gets strong, you can rent equipment (550-750 bahts) to cool off while watching corals and tropical fish. I suggest avoiding the hottest hours of the day and choosing the shade of an umbrella.

Explore temples and cultural sites in the shade

What to do in Koh Samui in April ? Visiting temples early in the morning is a great choice. I really like starting the day at Big Buddha (Wat Phra Yai): its 12-meter golden statue is impressive, and the sea view at sunrise is really beautiful. Wat Plai Laem, with its colorful statues and peaceful atmosphere, is also nice to discover at that time, when the air is still cooler. In April, some time slots are a bit less crowded, which makes the visit more calm. Just remember to wear light but covering clothes (shoulders and knees) and drink plenty of water.

Dive into waterfalls and cool hikes

Exploring the green inside of the island is, in my opinion, one of the best things to do in Koh Samui when it's hot. I really like going to Na Muang or Hin Lad waterfalls: their natural pools offer a cool and nice break after a morning in the sun. In April, they are usually well filled while still easy to reach. The paths go through shady areas, which makes walking more comfortable despite the heat. I advise wearing non-slip shoes, bringing enough water, and choosing the morning or late afternoon to enjoy this nature break fully.

Boat trips to Ang Thong Marine Park

A boat trip to Ang Thong National Marine Park is one of the must-do experiences around Koh Samui in April. This group of 42 islands offers amazing landscapes, between limestone cliffs, emerald lagoons, and isolated beaches. In April, the sea is often quite calm, which makes kayaking, snorkeling, and swimming easier. Many local agencies offer packages including lunch and transfers. Don't forget to check the weather forecast before leaving.

Relax in spas, massages, and night markets

In Koh Samui in April, when the heat gets stronger during the day, I like to suggest a break in a wellness center or air-conditioned spa. It's a great way to relax while escaping the sun. Thai massages, offered both on the beach and in special places, help release tension and enjoy a real cool moment. In the evening, when temperatures drop, the atmosphere changes completely: I suggest walking around the night markets, especially at Fisherman’s Village, to taste pad thai or grilled seafood. In April, the atmosphere is even more lively thanks to Songkran festivities.

3. My practical advices for a successful trip in April

• Accommodation: Choose a hotel near Chaweng or Bophut for easy access to beaches and restaurants. I always pick bungalows with AC and a pool – essential when it's 33°C!

• Transport: Rent a scooter (be careful with the heat, wear a helmet) or take songthaews. For arrival, direct flight from Bangkok (1h).

• Health and precautions: Drink water all the time, avoid alcohol in the middle of the day, and protect yourself from mosquitoes in the evening. If you are sensitive to heat, plan air-conditioned naps.

• Budget: April is still affordable before high season, but book in advance for Songkran.

In summary, Koh Samui weather in April means tropical heat, turquoise sea, and festive atmosphere. It’s a perfect time to enjoy beaches, sea trips, and lively evenings fully, as long as you adjust your schedule to the high temperatures. Between refreshing swims, cultural discoveries at sunrise, and relaxing moments in spas, everyone can find their balance. To organize your stay in the best conditions, you can also contact Autour Asia – a travel agency in Asia, to get personal advice and a program suited to the season. All that’s left is to pack your bag and enjoy the experience fully.