Nani Gwenneth

Weather In Puerto Vallarta In December 2025. Get puerto vallarta weather conditions in december. The average sea water temperature in puerto vallarta in december is 28.2°c (82.8°f) which is very warm and ideal for relaxing and swimming for the whole day.

But due to the very high humidity, it can feel very uncomfortable. In puerto vallarta, mexico, during december, the rain falls for 6.5 days and regularly aggregates up to 28mm (1.1) of precipitation.