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May is Guam's true shoulder season — the dry season has ended but the full wet season hasn't hit yet. Expect warm, humid weather with occasional afternoon showers. Crowds are thin and prices are at their lowest. A good month for budget-conscious travelers.
27–32°C (81–90°F)
Air temp
29°C (84°F)
Sea temp
Moderate (sporadic showers)
Rainfall
Low
Crowds
why go
what's on
Memorial Day Weekend
Last Monday of MayUS federal holiday observed in Guam with some local events and beach gatherings.
travel tips
Pack a compact waterproof rain jacket — showers come quickly and pass quickly in May.
May is ideal for budget travelers — you get excellent weather most days at 30–40% lower rates than peak season.
Water sports operators are less busy in May — you may get better rates and more attention from instructors.
common questions
May has more rain than January–April, but it's mostly short afternoon showers rather than prolonged rain. You'll still get plenty of sunshine. The showers tend to arrive in the afternoon, clear quickly, and leave everything feeling fresh.
Yes — May is one of the best value months to visit Guam. Hotel rates are often 25–40% lower than peak season, and popular spots like beaches and restaurants are uncrowded. The minor trade-off is slightly more humidity and occasional rain.
Pack light summer clothing plus a compact waterproof rain jacket or packable poncho — May showers come quickly and the jacket doubles as wind protection on boat tours. Quick-dry swimwear is useful as everything dries fast in the heat. Sunscreen remains essential even in overcast conditions. Insect repellent is advisable for any jungle hiking, as humidity increases mosquito activity.
Yes — water sports continue throughout May. Snorkelling and diving are still excellent, though visibility can be slightly lower than peak dry season. Tours operate daily and prices are often negotiable given lower demand. The warm sea temperature (29°C) makes extended time in the water very comfortable. Book flexible-cancellation tickets in case afternoon showers force tour operators to reschedule.