In September, Chiang Rai typically sees daytime highs of 30.9°C and overnight lows around 22.8°C. Compared to the annual average high of 30.7°C, September runs +0.2°C.
September in Chiang Rai averages a daytime high of 30.9°C and an overnight low of 22.8°C.
September runs +0.2°C compared to Chiang Rai's annual average high of 30.7°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 30.9°C and cooler evenings around 22.8°C.