Weather in Ko Samui in January
Ko Samui, Thailand averages a high of 27.7°C (81.9°F) and low of 25.3°C (77.5°F) in January, with 10 rain days and 10.5 hours of daily sunshine. Travel score: 80.3/100 (Excellent). The best time to visit Ko Samui is February.
High
28°C82°F
Low
25°C78°F
🌧️
10
rain days
☀️
10.5
hrs/day sunshine
💧
77%
humidity
80— Excellent
January in Ko Samui is warm and occasionally wet — ideal for sightseeing and outdoor activities.
What are the average temperatures in Ko Samui?
How much does it rain in Ko Samui in January?
Ko Samui receives an average of 73.9mm of rainfall across 10 rainy days in January. The annual total is 1531.5mm.
What should I pack for Ko Samui in January?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 28°C
🧴
Sunscreen SPF 30+
11 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Recommended
🧥
Light rain jacket
Some rainy days expected (10 days)
☔
Umbrella
Be prepared for occasional showers
Traveling to Thailand in January?
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