January is Guam's peak tourist season — it's the height of the dry season with little to no rainfall, clear sunny skies, and calm turquoise water. Expect full hotels, higher prices, and busy beaches. Book everything well in advance.
25–29°C (77–84°F)
Air temp
27°C (81°F)
Sea temp
Very Low (driest month)
Rainfall
Peak
Crowds
at a glance
Weather
Guam weather in January is usually very reliable for beaches and water tours.
Crowds
January is peak season in Guam, with busy hotels and popular tours.
Prices
Expect top-season pricing for flights and hotels.
Booking Window
Book 8–12 weeks ahead for flights, resorts, and top restaurants.
why go
what's on
New Year Celebrations
January 1New Year's Eve and Day festivities across Tumon hotels and beachfront venues. Fireworks visible over Tumon Bay.
Three Kings Day
January 6A CHamoru cultural celebration marking the Feast of the Epiphany, observed in some villages with traditional food and gatherings.
travel tips
Book hotels and flights 2–3 months in advance — January fills up faster than any other month.
Expect higher hotel rates (20–40% above shoulder season) during Japanese and Korean school holiday periods.
Water visibility is exceptional in January — perfect for underwater photography if you have a waterproof camera.
common questions
January is the best month to visit Guam — dry season at its peak, with the lowest rainfall of the year, clear skies, and excellent snorkeling conditions. The main downside is peak crowds and higher prices.
January temperatures in Guam range from 25°C to 29°C (77–84°F) with low humidity. Evenings can feel slightly cooler at around 24°C. The sea temperature is a comfortable 27°C.
Pack light summer clothing — shorts, T-shirts, and swimwear. A light layer for air-conditioned restaurants and hotel lobbies is useful. Reef-safe sunscreen is essential as UV intensity is high even in January. Comfortable walking shoes and water shoes for reef snorkelling complete the essentials. An umbrella is rarely needed in January but a compact one adds peace of mind.
January's dry season makes all outdoor activities ideal. Top picks include snorkelling and diving (best visibility of the year), parasailing and water sports on Tumon Bay, ATV and jeep tours through the jungle, sunset catamaran cruises, and beach days at Ritidian and Gun Beach. Shopping is also excellent in January — duty-free stores are fully stocked and New Year sales run through the month.
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