Hanoi edges it in September. Bangkok averages 25–33°C with very low crowds; Hanoi 25–32°C with low–moderate crowds.
By Daan · Last reviewed October 2026
Bangkok and Hanoi
The verdict for September
Wettest, cheapest, quietest
+One of the quietest and best-value periods of the year.
–The wettest part of the year, with frequent heavy rain and potential flooding.
Maximum value if you can tolerate the rain.
Still wet, but conditions begin improving
+Good value continues as temperatures begin to ease.
–Rainfall remains high at 225mm across roughly 14 rainy days.
Late September can hint at autumn while retaining low-season pricing.
Scores and crowd levels are my own judgement; temperatures are monthly averages. Higher scores are better: quieter, cheaper and more pleasant.
Another month