Koh Samui · Month comparison
August vs April
April ranks #1 overall vs August at #8. Songkran brings Thai New Year festivities — warm, slightly wetter, but culturally unmissable.
August
#8 of 12 months
Strong option
Still peak with good but slightly less reliable weather — August is busier than July.
- ↑Weather remains good: mostly sunny mornings, afternoon showers shorter than in June
- ↑Best month for diving on the east side; visibility at Sail Rock and the Anthong wrecks excellent
April
#1 of 12 months
Best match
Songkran brings Thai New Year festivities — warm, slightly wetter, but culturally unmissable.
- ↑Songkran water festival (13–15 April) transforms Na Thon and Chaweng into celebrations of Thai New Year
- ↑Good value accommodation: 30–35% below peak-season rates with weather still mostly excellent
| Factor | August | April |
|---|---|---|
| Weather score | 7 | 7 |
| Value score | 4 | 6 |
| Crowd score | 3 | 6 |
| Events score | 5 | 7 |
| Atmosphere | 7 | 8 |
| Avg high temp | 31.2°C | 32.8°C |
| Monthly rain | 105mm | 83mm |
| Daily sunshine | 7hrs | 7.5hrs |
August trade-offs
- ↓Accommodation prices at peak across the island — sold out at many quality properties
- ↓August can be slightly wetter than July; weather not as consistent as Feb–Apr
- ↓Koh Tao day trips massively in demand; book boats well in advance
April trade-offs
- ↓Songkran week: hotel prices spike temporarily and transport books up fast
- ↓83mm of rain is manageable but occasional heavy afternoon showers begin appearing
- ↓Peak heat of 32.8°C: demanding for any strenuous outdoor activity between 11am and 3pm
Scores compare months within Koh Samui. Climate data: Open Meteo ERA5 30-year normals (1991–2020). Methodology →