Koh Samui Weather by Month & Temperature | Best Time to Visit

Plan your trip with this complete Koh Samui climate guide and seasonal travel tips.
Global Traveller
5 min read

Planning Your Trip: A Guide to Koh Samui Weather

Dreaming of a tropical escape? Koh Samui, with its stunning beaches and lush landscapes, is a fantastic choice. Understanding the Koh Samui climate and Koh Samui weather patterns is key to planning the perfect holiday, so let's dive into the details to help you make the most of your trip, whether you're checking the Koh Samui weather forecast or just curious about the current weather in Koh Samui.

Koh Samui Weather by Month

January Weather in Koh Samui

Kick off the year with sunshine! January weather in Koh Samui is generally lovely, making it a popular time to visit. You can expect plenty of sunshine and comfortable temperatures, perfect for exploring the island. The temperature in Koh Samui in January typically ranges from a high of 30°C (86°F) to a low of 24°C (75°F).

This month falls within the dry season. Pack light, breathable clothing, swimwear, and sunscreen. Don't forget a hat and sunglasses to protect yourself from the sun.

February Weather in Koh Samui

February weather in Koh Samui continues the trend of beautiful, dry days. The Koh Samui weather February offers ideal conditions for beach lovers and those seeking outdoor adventures. The temperature in Koh Samui in February hovers around the same as January, with highs of 31°C (88°F) and lows of 25°C (77°F).

February is still firmly in the dry season. Pack as you would for January: light clothing, swimwear, and sun protection are essential.

March Weather in Koh Samui

As March rolls around, the weather starts to heat up a bit. The Koh Samui weather March is still generally dry, but you might notice a slight increase in humidity. The temperature in Koh Samui in March sees highs of 32°C (90°F) and lows of 26°C (79°F).

Light, airy clothing is still your best bet. Stay hydrated and consider bringing insect repellent, as the warmer weather can attract more mosquitoes.

April Weather in Koh Samui

April weather in Koh Samui is hot and sunny, marking the peak of the dry season. The april weather in Koh Samui is perfect for those who love the heat. The temperature in Koh Samui in April can reach highs of 33°C (91°F) and lows of 27°C (81°F).

Pack light, breathable clothing, swimwear, and plenty of sunscreen. A hat and sunglasses are crucial for protection from the intense sun.

May Weather in Koh Samui

May signals the transition towards the wet season, but don't let that deter you! The Koh Samui weather May still offers plenty of sunshine, with occasional showers. The temperature in Koh Samui in May remains warm, with highs of 32°C (90°F) and lows of 26°C (79°F).

Pack light clothing, swimwear, and a light rain jacket or umbrella. Be prepared for both sunshine and the possibility of rain.

June Weather in Koh Samui

June weather in Koh Samui sees a continuation of the wet season, with more frequent rainfall. However, the showers are often short-lived, leaving plenty of sunshine in between. The Koh Samui weather June offers a mix of sun and showers. The temperature in Koh Samui in June is around 31°C (88°F) during the day and 26°C (79°F) at night.

Pack light clothing, swimwear, and a rain jacket or umbrella. Waterproof bags are also a good idea to protect your belongings.

July Weather in Koh Samui

July weather in Koh Samui continues the trend of the wet season, with a mix of sunshine and showers. The july weather in Koh Samui is still warm and humid. The temperature in Koh Samui in July is similar to June, with highs of 31°C (88°F) and lows of 26°C (79°F).

Pack light clothing, swimwear, and a rain jacket or umbrella. Consider bringing waterproof bags to protect your belongings.

Discover flight with Traveloka

Sun, 3 May 2026

Scoot

Singapore (SIN) to Koh Samui (USM)

Start from S$202.67

Mon, 6 Apr 2026

Scoot

Singapore (SIN) to Koh Samui (USM)

Start from S$203.64

Wed, 22 Apr 2026

Bangkok Airways

Singapore (SIN) to Koh Samui (USM)

Start from S$290.40

August Weather in Koh Samui

August weather in Koh Samui is similar to July, with a mix of sunshine and showers. The august weather in Koh Samui is still warm and humid. The temperature in Koh Samui in August is around 31°C (88°F) during the day and 26°C (79°F) at night.

Pack light clothing, swimwear, and a rain jacket or umbrella. Waterproof bags are also a good idea to protect your belongings.

September Weather in Koh Samui

September weather in Koh Samui sees an increase in rainfall as the wet season progresses. The september weather in Koh Samui is still warm, but expect more frequent and heavier showers. The temperature in Koh Samui in September remains around 31°C (88°F) during the day and 25°C (77°F) at night.

Pack light clothing, swimwear, and a good quality rain jacket or umbrella. Waterproof bags are essential.

October Weather in Koh Samui

October weather in Koh Samui is one of the wettest months, with significant rainfall. The october weather in Koh Samui is still warm, but expect more frequent and heavier showers. The temperature in Koh Samui in October is around 30°C (86°F) during the day and 25°C (77°F) at night.

Pack light clothing, swimwear, and a good quality rain jacket or umbrella. Waterproof bags are essential.

November Weather in Koh Samui

November weather in Koh Samui is still part of the wet season, but the rainfall tends to decrease towards the end of the month. The november weather in Koh Samui is still warm, but expect more frequent and heavier showers. The temperature in Koh Samui in November is around 30°C (86°F) during the day and 24°C (75°F) at night.

Pack light clothing, swimwear, and a good quality rain jacket or umbrella. Waterproof bags are essential.

December Weather in Koh Samui

December weather in Koh Samui marks the beginning of the dry season, with less rainfall and more sunshine. The december Koh Samui weather is a popular time to visit. The temperature in Koh Samui in December is around 30°C (86°F) during the day and 24°C (75°F) at night.

Pack light clothing, swimwear, and sunscreen. A light jacket might be useful for cooler evenings.


Koh Samui Seasons Weather

Koh Samui experiences two main seasons: the dry season and the wet season. The dry season typically runs from December to April, with the temperature in Koh Samui averaging around 30-33°C (86-91°F). The wet season lasts from May to November, with the temperature in Koh Samui averaging around 28-31°C (82-88°F).

Here are some attractions suitable for each season:

1.
Dry Season (December - April):
2.
Wet Season (May - November):

Best Time to Visit Koh Samui

The best time to visit Koh Samui depends on your preferences. For the best weather, the dry season (December to April) is ideal, with plenty of sunshine and low humidity. However, this is also the peak season, so expect higher prices and more crowds. If you don't mind occasional showers, the shoulder seasons (May and September) offer a good balance of sunshine and fewer crowds. The Koh Samui weather now is always changing, so it's always a good idea to check the Koh Samui weather update before you go.

FAQ about weather in Koh Samui

1.
Is it always raining in Koh Samui during the wet season? No, the rain usually comes in short bursts, and there's still plenty of sunshine.
2.
What's the temperature in Koh Samui year-round? The average temperature is around 28-33°C (82-91°F).
3.
Do I need a rain jacket? Yes, especially if you're visiting during the wet season.
4.
What should I pack for Koh Samui? Pack light, breathable clothing, swimwear, sunscreen, a hat, and sunglasses.
5.
How can I check the Koh Samui weather weekly? You can find reliable weather forecasts online from various sources.

Conclusion

Ready to experience the "Island of Coconuts"? Traveloka makes your trip to Koh Samui seamless and tropical. From the iconic golden Big Buddha to the turquoise lagoons of Ang Thong and the vibrant vibes of Chaweng, start planning your perfect Thai island getaway today!

🛫 Fly to Koh Samui

Skip the hassle and find the best Flight Tickets from Singapore to Koh Samui directly through Traveloka.

Fly from Singapore to Samui Airport (USM) in approximately 1 hour and 50 minutes. With daily direct flights operated by Bangkok Airways and Scoot, your island holiday begins the moment you land at one of the world's most beautiful open-air airports.

🏨 Find Your Perfect Island Stay

Whether you’re looking for a luxury pool villa or a social beachfront resort, you can book your Hotels in Koh Samui with Traveloka.

🎡 Top Places to Visit and Activities

Koh Samui is a diverse island where spiritual landmarks meet world-class marine adventures. Secure your Koh Samui Attraction Tickets in advance to explore these top places to visit in Koh Samui and experience the island's best Koh Samui activities:

Ang Thong National Marine Park Day Tour – One of the most essential Koh Samui activities; explore an archipelago of 42 islands, kayak through limestone caves, and hike to the Emerald Lagoon.
Big Buddha Temple (Wat Phra Yai) – Koh Samui's most iconic landmark. This 12-meter-tall golden statue is a must-see among places to visit in Koh Samui, especially during sunset.
Koh Tao & Koh Nang Yuan Snorkeling – Take a speedboat to the best diving and snorkeling spots in the Gulf of Thailand, famous for vibrant coral reefs and the iconic sandbar beach.
Pig Island (Koh Madsum) Private Boat Tour – One of the trendiest Koh Samui activities; take a traditional longtail boat to meet and feed the friendly wild pigs that roam the white sands.
Fisherman’s Village Walking Street – Visit on a Friday evening for the island's best street food, local crafts, and fire shows on the beach.
Samui Elephant Sanctuary – Support ethical tourism at the island's first award-winning sanctuary where you can observe rescued elephants in their natural habitat.

Start planning your Koh Samui tropical escape today!

In This Article

• Planning Your Trip: A Guide to Koh Samui Weather
• Koh Samui Weather by Month
• January Weather in Koh Samui
• February Weather in Koh Samui
• March Weather in Koh Samui
• April Weather in Koh Samui
• May Weather in Koh Samui
• June Weather in Koh Samui
• July Weather in Koh Samui
• August Weather in Koh Samui
• September Weather in Koh Samui
• October Weather in Koh Samui
• November Weather in Koh Samui
• December Weather in Koh Samui
• Koh Samui Seasons Weather
• Best Time to Visit Koh Samui
• FAQ about weather in Koh Samui
• Conclusion
• 🛫 Fly to Koh Samui
• 🏨 Find Your Perfect Island Stay
• 🎡 Top Places to Visit and Activities

Flights Featured in This Article

Sun, 3 May 2026
Scoot
Singapore (SIN) to Koh Samui (USM)
Start from S$202.67
Book Now
Mon, 6 Apr 2026
Scoot
Singapore (SIN) to Koh Samui (USM)
Start from S$203.64
Book Now
Wed, 22 Apr 2026
Bangkok Airways
Singapore (SIN) to Koh Samui (USM)
Start from S$290.40
Book Now

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