In September, Kathmandu typically sees daytime highs of 26.0°C and overnight lows around 17.1°C. Compared to the annual average high of 23.2°C, September runs +2.8°C.
September in Kathmandu averages a daytime high of 26.0°C and an overnight low of 17.1°C.
September runs +2.8°C compared to Kathmandu's annual average high of 23.2°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 26.0°C and cooler evenings around 17.1°C.