Hanoi vs Vientiane

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Hanoi edges ahead as the better destination in September. Hanoi offers 8 hours of daily sunshine with only 19 rain days, while Vientiane sees 8 sunshine hours and 24 rain days.

Hanoi can feel quite hot at 30°C, so plan for heat. Vientiane runs hot at 30°C.

For travelers who prioritize dry weather, Hanoi is the stronger choice in September.

Hanoi reaches an average high of 30°C (86°F) and drops to 24°C (75°F) at night during September. The daily temperature range is 6°C, meaning relatively stable temperatures from day to night.

Vientiane averages 30°C (86°F) for the high and 24°C (75°F) for the low, with a daily range of 6°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.

Hanoi receives approximately 242 mm of rainfall across 19 rain days during September. Rain is frequent, so waterproof gear is essential.

Vientiane sees 303 mm over 24 rain days. That makes Hanoi the drier option by 5 rain days and 61 mm of total precipitation.

Both cities share similar humidity levels at 78%.