Koh Samui Weather Forecast

7-day forecast, current conditions, and travel weather tips for Koh Samui, Thailand.

When to Visit Koh Samui

Best Months

February to June

Avoid If Possible

October to December (Gulf monsoon peak)

Koh Samui's monsoon runs opposite to the Andaman coast — it's wettest Oct-Dec when Phuket is dry. Best beach weather is Feb-June.

Weather Hazards in Koh Samui

Gulf storms can be sudden and violent
Ferry services suspended during storms
Flooding on low-lying coastal roads

What to Pack for Koh Samui

Waterproof bag for electronics
Quick-dry clothing
Reef shoes

Seasonal Weather in Koh Samui

Hot Season (March - May)

The hottest months with temperatures often exceeding 38°C in central Thailand. Humidity is high and afternoon thunderstorms are possible.

Rainy Season (June - October)

Monsoon season brings daily downpours, usually in the afternoon. Mornings are often sunny. Flooding possible in low-lying areas.

Cool Season (November - February)

The most comfortable season for travel. Temperatures are pleasant (20-30°C) with low humidity. Peak tourist season.

Need help in Koh Samui?

Tourist Police: 1155 (24/7, English) | Emergency: 1669

Frequently Asked Questions

What is the best time to visit Koh Samui?

The best time to visit Koh Samui is February to June. Avoid October to December (Gulf monsoon peak) if possible.

What should I pack for Koh Samui?

Essential items for Koh Samui: Waterproof bag for electronics, Quick-dry clothing, Reef shoes. Adjust based on the season you're visiting.

Does it rain a lot in Koh Samui?

During monsoon season, Koh Samui sees daily rain, usually in short afternoon bursts lasting 1-2 hours. Mornings are typically sunny. Annual rainfall varies by coast — check the monsoon calendar for your travel dates.

How hot does Koh Samui get?

During the hot season (March-May), Koh Samui can reach 35-40°C with high humidity. The "feels like" temperature often exceeds 40°C. The cool season (Nov-Feb) is much more comfortable at 20-30°C.

Weather in Other Destinations

Weather

Bangkok Weather Forecast

7-day forecast and travel weather tips for Bangkok

Read guide Weather

Phuket Weather Forecast

7-day forecast and travel weather tips for Phuket

Read guide Weather

Chiang Mai Weather Forecast

7-day forecast and travel weather tips for Chiang Mai

Read guide Weather

Pattaya Weather Forecast

7-day forecast and travel weather tips for Pattaya

Read guide Weather

Krabi Weather Forecast

7-day forecast and travel weather tips for Krabi

Read guide Weather

Koh Phangan Weather Forecast

7-day forecast and travel weather tips for Koh Phangan

Read guide

Seasonal Weather in Koh Samui

Hot Season (March - May)

The hottest months with temperatures often exceeding 38°C in central Thailand. Humidity is high and afternoon thunderstorms are possible.

Rainy Season (June - October)

Monsoon season brings daily downpours, usually in the afternoon. Mornings are often sunny. Flooding possible in low-lying areas.

Cool Season (November - February)

The most comfortable season for travel. Temperatures are pleasant (20-30°C) with low humidity. Peak tourist season.

Frequently Asked Questions

What is the best time to visit Koh Samui?

The best time to visit Koh Samui is February to June. Avoid October to December (Gulf monsoon peak) if possible.

What should I pack for Koh Samui?

Essential items for Koh Samui: Waterproof bag for electronics, Quick-dry clothing, Reef shoes. Adjust based on the season you're visiting.

Does it rain a lot in Koh Samui?

How hot does Koh Samui get?

During the hot season (March-May), Koh Samui can reach 35-40°C with high humidity. The "feels like" temperature often exceeds 40°C. The cool season (Nov-Feb) is much more comfortable at 20-30°C.