In December, Santiago typically sees daytime highs of 27.1°C and overnight lows around 12.2°C. Compared to the annual average high of 21.1°C, December runs +5.9°C.
December in Santiago averages a daytime high of 27.1°C and an overnight low of 12.2°C.
December runs +5.9°C compared to Santiago's annual average high of 21.1°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 27.1°C and cooler evenings around 12.2°C.