Koh Samui vs Penang

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Koh Samui edges ahead as the better destination in January. Koh Samui offers 11 hours of daily sunshine with only 11 rain days, while Penang sees 10 sunshine hours and 15 rain days.

Koh Samui sits in the comfortable travel range at 25°C. Penang runs hot at 29°C.

For travelers who prioritize dry weather, Koh Samui is the stronger choice in January. Koh Samui receives 1 more hour of sunshine per day, which matters for sightseeing and outdoor activities.

Koh Samui reaches an average high of 25°C (77°F) and drops to 23°C (73°F) at night during January. The daily temperature range is 2°C, meaning relatively stable temperatures from day to night.

Penang averages 29°C (84°F) for the high and 24°C (75°F) for the low, with a daily range of 5°C. The 4°C difference is noticeable but not dramatic.

Both cities are in the Northern Hemisphere, so they share the same seasonal pattern in January.

Koh Samui receives approximately 81 mm of rainfall across 11 rain days during January. You can expect rain roughly every other day.

Penang sees 114 mm over 15 rain days. That makes Koh Samui the drier option by 4 rain days and 33 mm of total precipitation.

Both cities share similar humidity levels at 82%.