In September, Mong Cai typically sees daytime highs of 30.6°C and overnight lows around 23.2°C. Compared to the annual average high of 25.8°C, September runs +4.8°C.
September in Mong Cai averages a daytime high of 30.6°C and an overnight low of 23.2°C.
September runs +4.8°C compared to Mong Cai's annual average high of 25.8°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 30.6°C and cooler evenings around 23.2°C.