Bangkok vs Koh Samui

Bangkok and Koh Samui 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.

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.

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%.