Koh Samui vs Penang

Koh Samui and Penang are closely matched in May. Neither city has a clear advantage across all metrics. Your decision should come down to personal preference, cultural interests, and travel logistics rather than weather alone.

Koh Samui can feel quite hot at 32°C, so plan for heat. Penang runs hot at 30°C.

For travelers who prioritize dry weather, Koh Samui is the stronger choice in May. Penang receives 3 more hours of sunshine per day, which matters for sightseeing and outdoor activities.

Koh Samui reaches an average high of 32°C (90°F) and drops to 25°C (77°F) at night during May. The daily temperature range is 7°C, meaning relatively stable temperatures from day to night.

Penang averages 30°C (86°F) for the high and 26°C (79°F) for the low, with a daily range of 4°C. The 2°C difference is noticeable but not dramatic.

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

Koh Samui receives approximately 201 mm of rainfall across 17 rain days during May. Rain is frequent, so waterproof gear is essential.

Penang sees 237 mm over 27 rain days. That makes Koh Samui the drier option by 10 rain days and 36 mm of total precipitation.

Both cities share similar humidity levels at 82%.