Weather in December
is a winter month in the wet season of Hawaii
that sees a major rise in the tourist numbers.
Average high temperatures are mild 79°F (26.1°C), while average low temperatures drop to a comfortable 70°F (21.1°C). There are many sunny days on the leeward side of the mountains where the rainfall mostly occurs during the wet season.
Honolulu averages 68°F (20°C) to 81°F (27.2°C), while Hilo on the coast is a bit lower in the 64°F (17.8°C) to 79°F (26.1°C) on the windward side. The mountains touch a high of 43°F (6.1°C) to 50°F (10°C), while the lows are in the cold range of 28°F (-2.2°C) to 36°F (2.2°C). The plateau area at a lower elevation of 2000 meters registers a temperature range of 41°F (5°C) to 66°F (18.9°C).
Rainfall differs from 3.1" (79mm) on the leeward side to 11.6" (295mm) on the coast, while the mountain peaks receive little rain. December experiences frequent thunder and Kona storms with wind speeds of 60 to 100mph (160.9km/h).
Light clothes in the day with a scarf for the wind and a light jacket or raincoat are mostly sufficient at lower elevations.