In September, Dehiwala-Mount Lavinia typically sees daytime highs of 29.7°C and overnight lows around 24.4°C. Compared to the annual average high of 30.4°C, September runs -0.7°C.
September in Dehiwala-Mount Lavinia averages a daytime high of 29.7°C and an overnight low of 24.4°C.
September runs -0.7°C compared to Dehiwala-Mount Lavinia's annual average high of 30.4°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 29.7°C and cooler evenings around 24.4°C.