Koh Samui · WinterMonth summary
Koh Samui weather in January
✅ Good
🌡️ Temperature min / max
24°C – 28°C
🌧 Rainy days
57% of days
☀️ Sunshine
10.9h per day on average
🌊 🌊 Season
Winter
⭐ ⭐ Weather score
7.6/10
📅 📅 Best month
March (7.9/10)
Quick decision
Should you visit Koh Samui in January?
✅ Good
✅ Yes if: you're willing to accept showers in exchange for lower prices and fewer tourists.
❌ No if: you're planning 100% outdoor activities — rain is frequent.
Our take: Koh Samui in January: 28°C and 10.9h of sunshine. Decent, but not the peak.
By trip type
Koh Samui in January by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ✅ Good
- 🏖️ Beach / swimming : ✅ Good
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in January
🎯 Water at 25°C and lively beaches — January is peak swimming season in Koh Samui Even in winter, Koh Samui enjoys 28°C. A real asset for escaping the European cold. With 57% of rainy days, always have indoor alternatives planned. A good balance between weather and crowds, even if March (7.9/10) remains theoretically better.
Browse by month
All months for Koh Samui
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌤️ January | 24°C | 28°C | 57% | 4.3 | 10.9h | 7.6/10 |
| 🌤️ February | 25°C | 29°C | 48% | 2.1 | 11.0h | 7.8/10 |
| 🌤️ March | 26°C | 30°C | 35% | 1.4 | 11.0h | 7.9/10 |
| 🌤️ April | 26°C | 31°C | 49% | 3.6 | 11.2h | 7.4/10 |
| ⛅ May | 26°C | 31°C | 65% | 3.8 | 11.1h | 7.2/10 |
| 🌤️ June | 26°C | 31°C | 54% | 2.5 | 10.9h | 7.3/10 |
| 🌤️ July | 26°C | 31°C | 59% | 3.2 | 10.0h | 7.2/10 |
| 🌤️ August | 26°C | 31°C | 59% | 2.7 | 10.6h | 7.2/10 |
| ⛅ September | 26°C | 30°C | 67% | 4.4 | 10.0h | 7.1/10 |
| 🌧️ October | 25°C | 29°C | 88% | 7.3 | 9.9h | 7.0/10 |
| ⛅ November | 25°C | 28°C | 83% | 9.5 | 10.0h | 7.1/10 |
| ⛅ December | 24°C | 28°C | 63% | 7.2 | 10.5h | 7.4/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In January, Koh Samui averages 28°C, 57% rainy days and 10.9h of sunshine per day. Overall weather score: 7.6/10.
See methodology →
Comparison
January vs March (best month)
The best month is March (score 7.9/10). Difference:
- 🌡️ Max temperature : +2°C
- 🌧 Rainy days : -22%
- ☀️ Sunshine : +0.1h/day
FAQ
FAQ — Koh Samui in January
Is January a good time to visit Koh Samui?
January is an excellent time to visit Koh Samui (score 7.6/10). With 28°C, 10.9h of sunshine and 57% rain, conditions are very favourable.
Does it rain a lot in Koh Samui in January?
Yes, 57% of days see rain in January. Plan some indoor activities as backup.
Accommodation
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Activities & tours
Activities and tours in Koh Samui
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Explore also
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