Koh Samui vs Bangkok

Koh Samui and Bangkok 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.

Koh Samui sits in the comfortable travel range at 25°C. Bangkok runs hot at 31°C.

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

Koh Samui reaches an average high of 25°C (77°F) and drops to 23°C (73°F) at night during December. The daily temperature range is 2°C, meaning relatively stable temperatures from day to night.

Bangkok averages 31°C (88°F) for the high and 21°C (70°F) for the low, with a daily range of 10°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.

Koh Samui receives approximately 147 mm of rainfall across 14 rain days during December. You can expect rain roughly every other day.

Bangkok sees 9 mm over 2 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%.