Bangkok 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 Bangkok sees 10 sunshine hours and 21 rain days.

Bangkok can feel quite hot at 33°C, so plan for heat. Koh Samui is also comfortable at 27°C.

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

Bangkok reaches an average high of 33°C (91°F) and drops to 26°C (79°F) at night during May. The daily temperature range is 7°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. There is a notable 6°C gap between the two cities, so expect a very different feel.

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

Bangkok receives approximately 135 mm of rainfall across 21 rain days during May. Rain is frequent, so waterproof gear is essential.

Koh Samui sees 115 mm over 22 rain days. That makes Bangkok the drier option by 1 rain day and 20 mm of total precipitation.

Both cities share similar humidity levels at 82%.