KOH SAMUI WEATHER

Overview of Koh Samui’s Climate

• Tropical Monsoon Climate – Warm and humid all year, with a mix of sunshine and occasional rain.
• Three Main Seasons – Dry Season (Dec-Apr), Hot Season (May-Sep), and Rainy Season (Oct-Nov).
• Average Temperature – Ranges from 26°C to 33°C (79°F to 91°F).
• Ocean Temperature – Stays warm at 28°C to 30°C (82°F to 86°F), making it perfect for swimming and snorkeling year-round.

Unlike other Thai islands on the Andaman Sea (like Phuket and Krabi), Koh Samui’s weather is more stable, with less rainfall and fewer storms.

Koh Samui Weather by Season

1. Dry Season (December – April)

Best time to visit for beach lovers and outdoor activities.

• Weather: Sunny, clear skies, low humidity, little to no rain.
• Temperatures: 26°C to 32°C (79°F to 90°F).
• Sea Conditions: Calm and clear, perfect for snorkeling and diving.
• Ideal Activities: Beach days, boat tours, island-hopping, and outdoor exploration.

💡 Why visit during the Dry Season?

• The most comfortable weather with plenty of sunshine.
• The busiest time for tourism, so book hotels and tours in advance.
• Perfect for festivals and events like Christmas, New Year’s Eve, and Songkran (Thai New Year in April).

2. Hot Season (May – September)

Great for travelers looking for warm weather and fewer crowds.

• Weather: Hot and humid, occasional short rain showers.
• Temperatures: 28°C to 33°C (82°F to 91°F).
• Sea Conditions: Still calm, but occasional waves in some areas.
• Ideal Activities: Water sports, jungle hikes, temple visits, and wellness retreats.

💡 What to Expect?

• Higher humidity, but still plenty of sunshine.
• Less crowded beaches and better deals on accommodation.
• Occasional afternoon showers, but they pass quickly.

3. Rainy Season (October – November)

The quietest season, with heavy but short-lived rains.

• Weather: Frequent rain showers, sometimes heavy, but still warm.
• Temperatures: 26°C to 30°C (79°F to 86°F).
• Sea Conditions: Rougher waters, occasional strong winds.
• Ideal Activities: Spa treatments, yoga retreats, Thai cooking classes, and cultural experiences.

💡 Should You Visit During the Rainy Season?

• Cheaper hotel rates and fewer tourists.
• Rain usually falls in short bursts, with dry periods in between.
• Some boat tours may be canceled due to rough seas.

⚠️ Note: Unlike the Andaman Sea side (Phuket, Krabi), Koh Samui’s rainy season is shorter and less severe, making it a year-round travel destination.

Average Monthly Weather Breakdown

Best months for perfect weather: December to April.
Best months for budget travelers: May to November.
Best months for water sports: March to September (warmer water, good visibility).

Best Time to Visit Koh Samui

For Perfect Weather: December – April
For Fewer Crowds & Cheaper Prices: May – September
For Budget Travelers Who Don’t Mind Rain: October – November

Thanks to its year-round warmth and stable climate, Koh Samui is a great destination in any season. Whether you want sunny beach days, adventure tours, or a quiet tropical retreat, the island has something to offer no matter when you visit.

Find out more about Koh Samui’s best travel experiences on Samui Map Info, and plan your perfect island getaway!