Koh Samui vs Bangkok

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.

Koh Samui sits in the comfortable travel range at 27°C. Bangkok runs hot at 33°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.

Koh Samui reaches an average high of 27°C (81°F) and drops to 24°C (75°F) at night during May. The daily temperature range is 3°C, meaning relatively stable temperatures from day to night.

Bangkok averages 33°C (91°F) for the high and 26°C (79°F) for the low, with a daily range of 7°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.

Koh Samui receives approximately 115 mm of rainfall across 22 rain days during May. Rain is frequent, so waterproof gear is essential.

Bangkok sees 135 mm over 21 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%.