Siem Reap vs Bangkok

Siem Reap and Bangkok are closely matched in September. 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.

Siem Reap can feel quite hot at 30°C, so plan for heat. Bangkok runs hot at 30°C.

For travelers who prioritize dry weather, Bangkok is the stronger choice in September. Siem Reap receives 5 more hours of sunshine per day, which matters for sightseeing and outdoor activities.

Siem Reap reaches an average high of 30°C (86°F) and drops to 25°C (77°F) at night during September. The daily temperature range is 5°C, meaning relatively stable temperatures from day to night.

Bangkok averages 30°C (86°F) for the high and 23°C (73°F) for the low, with a daily range of 7°C. The two cities feel quite similar in terms of temperature.

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

Siem Reap receives approximately 257 mm of rainfall across 26 rain days during September. Rain is frequent, so waterproof gear is essential.

Bangkok sees 140 mm over 12 rain days. That makes Bangkok the drier option by 14 rain days and 117 mm of total precipitation.

Both cities share similar humidity levels at 82%.