In December, Dehiwala-Mount Lavinia typically sees daytime highs of 30.0°C and overnight lows around 22.6°C. Compared to the annual average high of 30.4°C, December runs -0.4°C.
December in Dehiwala-Mount Lavinia averages a daytime high of 30.0°C and an overnight low of 22.6°C.
December runs -0.4°C compared to Dehiwala-Mount Lavinia's annual average high of 30.4°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 30.0°C and cooler evenings around 22.6°C.