Vientiane vs Chiang Mai

Vientiane and Chiang Mai 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. Chiang Mai runs hot at 29°C.

For travelers who prioritize dry weather, both cities are equally dry in September.

Vientiane 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.

Chiang Mai averages 29°C (84°F) for the high and 23°C (73°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 303 mm of rainfall across 24 rain days during September. Rain is frequent, so waterproof gear is essential.

Chiang Mai sees 240 mm over 24 rain days. Both cities are equally rainy this month.

Both cities share similar humidity levels at 78%.