In December, Heidelberg typically sees daytime highs of 26.2°C and overnight lows around 13.0°C. Compared to the annual average high of 23.2°C, December runs +3.0°C.
December in Heidelberg averages a daytime high of 26.2°C and an overnight low of 13.0°C.
December runs +3.0°C compared to Heidelberg's annual average high of 23.2°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 26.2°C and cooler evenings around 13.0°C.