Bangkok vs Koh Samui

Bangkok and Koh Samui are closely matched in December. 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 31°C, so plan for heat. Koh Samui is also comfortable at 25°C.

For travelers who prioritize dry weather, Bangkok is the stronger choice in December.

Bangkok reaches an average high of 31°C (88°F) and drops to 21°C (70°F) at night during December. The daily temperature range is 10°C, meaning moderate variation throughout the day.

Koh Samui averages 25°C (77°F) for the high and 23°C (73°F) for the low, with a daily range of 2°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 December.

Bangkok receives approximately 9 mm of rainfall across 2 rain days during December. Rain is rare this month, so dry conditions are likely.

Koh Samui sees 147 mm over 14 rain days. That makes Bangkok the drier option by 12 rain days and 138 mm of total precipitation.

Both cities share similar humidity levels at 82%.