Weather in Ko Samui in September
Ko Samui, Thailand averages a high of 28.9°C (84°F) and low of 26.2°C (79.2°F) in September, with 22 rain days and 9 hours of daily sunshine. Travel score: 64.6/100 (Good). The best time to visit Ko Samui is February.
High
29°C84°F
Low
26°C79°F
🌧️
22
rain days
☀️
9
hrs/day sunshine
💧
80%
humidity
65— Good
September in Ko Samui is hot and very rainy — pack an umbrella and enjoy indoor attractions too.
What are the average temperatures in Ko Samui?
How much does it rain in Ko Samui in September?
Ko Samui receives an average of 146mm of rainfall across 22 rainy days in September. The annual total is 1531.5mm.
What should I pack for Ko Samui in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 29°C
🧥
Waterproof jacket
Frequent rain expected (22 rainy days)
☔
Umbrella
Essential for the rainy season
👢
Waterproof shoes
Keep your feet dry in wet conditions
🧴
Sunscreen SPF 30+
9 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Traveling to Thailand in September?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31