December in Hawaii typically marks the beginning of the wetter season and the arrival of winter swells. Temperatures are generally mild, ranging from the mid-70s to low 80s Fahrenheit (low- to mid-20s Celsius) during the day and dipping into the 60s Fahrenheit (mid-teens Celsius) at night. Rainfall varies considerably across the islands, with some areas experiencing significantly more precipitation than others. Ocean conditions can become rougher, particularly on north-facing shores, due to the large waves generated by winter storms in the North Pacific.
Understanding typical Hawaiian weather patterns during this month allows travelers to prepare appropriately for their trip. This knowledge facilitates informed decisions about packing, activity planning, and island selection. Historically, December has been a popular time to visit Hawaii for surfing enthusiasts seeking larger waves. Awareness of the prevailing conditions also allows visitors to maximize their enjoyment of outdoor activities and minimize potential disruptions caused by inclement weather.