December marks the beginning of the winter wet season in the Hawaiian Islands. This period typically experiences higher rainfall, cooler temperatures, and stronger surf, particularly on north-facing shores. Average daytime temperatures range from the mid-70s to low 80s Fahrenheit (low to mid-20s Celsius), while nighttime temperatures can dip into the 60s Fahrenheit (teens Celsius). The higher elevations, such as those on the Big Island, can experience significantly cooler temperatures, sometimes even dipping below freezing.
Understanding Hawaiian weather patterns during December is crucial for planning trips. While the increased rainfall can occasionally disrupt outdoor activities, it also contributes to the islands’ lush landscapes and vibrant waterfalls. This period offers a unique experience compared to the drier summer months, attracting visitors interested in whale watching (which begins in November/December), experiencing dramatic wave action, and enjoying fewer crowds. Historically, this period was associated with significant agricultural cycles linked to rainfall patterns.