Chiang Mai vs Vientiane

Chiang Mai and Vientiane 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.

Chiang Mai can feel quite hot at 29°C, so plan for heat. Vientiane runs hot at 30°C.

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

Chiang Mai reaches an average high of 29°C (84°F) and drops to 23°C (73°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.

Chiang Mai receives approximately 240 mm of rainfall across 24 rain days during September. Rain is frequent, so waterproof gear is essential.

Vientiane sees 303 mm over 24 rain days. Both cities are equally rainy this month.

Both cities share similar humidity levels at 78%.