Penang vs Koh Samui

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Koh Samui edges ahead as the better destination in May. Koh Samui offers 11 hours of daily sunshine with only 22 rain days, while Penang sees 10 sunshine hours and 27 rain days.

Penang can feel quite hot at 30°C, so plan for heat. Koh Samui is also comfortable at 27°C.

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

Penang reaches an average high of 30°C (86°F) and drops to 26°C (79°F) at night during May. The daily temperature range is 4°C, meaning relatively stable temperatures from day to night.

Koh Samui averages 27°C (81°F) for the high and 24°C (75°F) for the low, with a daily range of 3°C. The 3°C difference is noticeable but not dramatic.

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

Penang receives approximately 237 mm of rainfall across 27 rain days during May. Rain is frequent, so waterproof gear is essential.

Koh Samui sees 115 mm over 22 rain days. That makes Koh Samui the drier option by 5 rain days and 122 mm of total precipitation.

Both cities share similar humidity levels at 82%.