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When To Go · Destination Guide

Guam

Wrecks from two world wars, a heart shaped blue hole, and tropical walls in the Western Pacific

Updated Oct 30, 2025 • 34 sources

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When to go

Best time to visit Guam

Guam has a dry season from January to June and a rainy season July to November.

Best overall window

Jan-Jun

Drier weather, more leeward glass offs, 27°C to 29°C water.

Outside that window

Rainier with higher typhoon risk and stronger trades.

Choose your trip style

Start with the overall answer, then switch only when scuba, freedive, snorkel, or topside timing changes the trip in a meaningful way.

Month-by-month planner

The overall row stays visible so you can compare it against the currently selected scope.

BestGoodTradeoffsMore variable
ScopeJanFebMarAprMayJunJulAugSepOctNovDec
Overall
Wildlife goals and seasonal highlights

These do not replace the overall planner. Use them only if a specific animal or event is driving your trip dates.

  • Spinner Dolphins in Agat and Cocos channels

    Best for Snorkel, Topside

    Apr to Jul

    JanFebMarAprMayJunJulAugSepOctNovDec

    Morning boat rides along the south coast often encounter spinner dolphins.

  • Sea Turtle Nesting

    May to Aug

    JanFebMarAprMayJunJulAugSepOctNovDec

    Hawksbill and green turtles nest on select beaches.

Always true for this destination
  • School holidays bring busier Tumon hotels.
Seasonal cautions
  • Jul, Dec: Transitional winds, passing showers, plan around surf.
  • Aug to Nov: Rainier with higher typhoon risk and stronger trades.

Built from climate references, access rules, and destination operators. Wildlife timing and route flexibility can shift year to year.