In September, Vientiane typically sees daytime highs of 31.2°C and overnight lows around 23.8°C. Compared to the annual average high of 31.3°C, September runs -0.1°C.
September in Vientiane averages a daytime high of 31.2°C and an overnight low of 23.8°C.
September runs -0.1°C compared to Vientiane's annual average high of 31.3°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 31.2°C and cooler evenings around 23.8°C.