Best Time to Visit Guam

January to May is Guam's dry season — the time of year when rainfall is lowest, humidity is more manageable, and sunshine is most reliable. February through April is the peak of the dry season: days are typically clear, seas are calm, and snorkeling and diving visibility is at its best (often 20–30m+). This is when Guam is at its most photogenic.

January through March is also peak tourist season — primarily Japanese and Korean visitors taking advantage of school holidays and the best weather. Hotel rates are highest during this period, and popular tours and restaurants fill up more quickly. Book accommodation and activities well in advance for January–March travel.

April and May offer an excellent compromise: still dry season weather, with noticeably fewer crowds and slightly lower prices than January–March. May in particular is often overlooked by visitors and can be an excellent value window.

June and December are transitional months — between the dry and wet seasons. Weather in both months is generally good but increasingly variable. June marks the beginning of typhoon season (though typhoons before July are uncommon) and the start of the wet season's afternoon showers. December transitions out of the typhoon season with improving conditions through the month.

Both months offer lower hotel rates than peak season and moderate visitor numbers. June can have more cloud cover but is still excellent for water activities. December from mid-month onwards is one of the island's most festive periods, with Christmas markets and cultural events adding to the experience.

July through November is Guam's wet season and typhoon season. Afternoon showers are common and can be heavy. Typhoon risk is greatest from July through September — while direct hits are not guaranteed every year, the possibility of a typhoon during this period is real and can disrupt travel plans significantly.

The upside of wet season travel is considerable: hotel rates drop 30–50% compared to peak season, the island is far less crowded, and activities still operate on most days (rain showers are typically short and followed by sunshine). Waterfalls and jungle trails are at their most spectacular with maximum water flow. Divers who don't mind reduced visibility on exposed sites can find excellent conditions on sheltered dive sites year-round.

If travelling during the wet season, purchase comprehensive travel insurance that covers typhoon-related cancellations. Monitor the Joint Typhoon Warning Center (JTWC) for storm advisories. Most years, the wet season passes without a direct typhoon hit — but being prepared is essential.

January–February: Peak dry season, coolest temperatures, clearest skies, best diving visibility. Busiest and most expensive period. February is widely considered the single best month to visit.

March–April: Excellent weather continues. April sees fewer crowds than January–March with comparable conditions. Cherry blossom season in Japan and Korea sends waves of visitors in late March.

May: Often underrated — still dry season, noticeable drop in crowds, beginning of low-season pricing. One of the best value months.

June: Transitional month. Increasing cloud cover and afternoon showers begin, but weather is generally still pleasant. Prices drop significantly.

July–September: Typhoon season peak. Wetter, more unpredictable weather. Significant price drops. Plan with flexibility.

October–November: End of typhoon season. Weather improves through November. Good shoulder value for flexible travellers.

December: Festive season with improving weather. Christmas and New Year events across the island. Hotel rates start rising from mid-December.