December weather forecast and climate
Guam, USA

Flag of Guam, USA
Flag of Guam, USA

Weather in December

December is a transitional period to the dry season in Guam with a gradual increase in sunshine. The average temperatures are in the 77°F (25°C) to 86°F (30°C) range, but there is a decisive shift in the mood with the frequent breaking of cloud cover. The atmosphere is rarely cold, with nights mostly above 70°F (21.1°C).
The perspiring conditions give way to a comfortable and relaxed atmosphere with a drop in humidity. The average rainfall registers 6" (152mm) during 22 wet days in the month. The average daily sunshine increases to 142 hours in December, signaling bright days ahead.
The Apra Harbor is a favorite spot for diving and snorkeling in the clear waters. Visit the inland jungles to smell the perfume of wildflowers and watch the abundant species of animals and birds in the rainforests. White sandy beaches with gentle waves lap towards the shore. Expect plenty of activity during Christmas and the approaching New Year with comfortable weather on the cards in December.
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