Koh Samui vs Penang

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Koh Samui edges ahead as the better destination in December. Koh Samui offers 10 hours of daily sunshine with only 14 rain days, while Penang sees 9 sunshine hours and 21 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 December. 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 December. 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 25°C (77°F) for the low, with a daily range of 4°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 December.

Koh Samui receives approximately 147 mm of rainfall across 14 rain days during December. You can expect rain roughly every other day.

Penang sees 189 mm over 21 rain days. That makes Koh Samui the drier option by 7 rain days and 42 mm of total precipitation.

Both cities share similar humidity levels at 82%.