Vientiane vs Hanoi

Vientiane and Hanoi 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.

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

For travelers who prioritize dry weather, Vientiane is the stronger choice in September. Hanoi receives 4 more hours of sunshine per day, which matters for sightseeing and outdoor activities.

Vientiane reaches an average high of 30°C (86°F) and drops to 23°C (73°F) at night during September. The daily temperature range is 7°C, meaning relatively stable temperatures from day to night.

Hanoi 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.

Vientiane receives approximately 140 mm of rainfall across 12 rain days during September. You can expect rain roughly every other day.

Hanoi sees 242 mm over 19 rain days. That makes Vientiane the drier option by 7 rain days and 102 mm of total precipitation.

Both cities share similar humidity levels at 78%.