When To Go · Destination Guide
Guam Usa
Wrecks from two world wars, a heart shaped blue hole, and tropical walls in the Western Pacific
Updated Oct 30, 2025 • 34 sources
When To Go
Season planner for Guam
Guam has a dry season from January to June and a rainy season July to November. Typhoon risk peaks August to October. Water stays near 28°C year round, with lighter winds and calmer outer reefs most common late winter through spring. North and east coasts are often windy and surf exposed. Monitor NWS Guam for surf and rip current hazards.
At A Glance Heatmap
| Activity | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall | ||||||||||||
| Scuba | ||||||||||||
| Freedive | ||||||||||||
| Snorkel | ||||||||||||
| Topside |
Activity Drilldowns
OverallJan-Jun·Crowd:Moderate·Cost:Moderate
Ideal: Drier weather, more leeward glass offs, 27°C to 29°C water.
Plan Carefully: Rainier with higher typhoon risk and stronger trades.
School holidays bring busier Tumon hotels.
ScubaFeb-May·Crowd:Light·Cost:Moderate
Ideal: Calmer seas on walls, consistent visibility, 28°C water.
Plan Carefully: Stronger trades and typhoon season. Favor Apra Harbor and leeward sites.
Wreck and wall demand peaks in dry months.
FreediveMar-Jun·Crowd:Light·Cost:Moderate
Ideal: Lighter wind and calmer sea states for line work and drifts.
Plan Carefully: Wind and swell increase. Choose mornings and leeward aspects.
Always carry a float and flag.
SnorkelMar-Jun·Crowd:Moderate·Cost:Moderate
Ideal: Clearer lagoon water and lighter winds in preserves.
Plan Carefully: Rain and swell. Heed jellyfish advisories and surf warnings.
Choose sandy entries and avoid standing on coral.
TopsideJan-Apr·Crowd:Moderate·Cost:Moderate
Ideal: Drier hikes and clearer vistas.
Plan Carefully: More heat and rain. Track tropical systems.
Refuge and park areas may close during hazardous surf.
Seasonal Callouts Timeline
Spinner Dolphins in Agat and Cocos channels
JanJanFebFebMarMarAprAprMayMayJunJunJulJulAugAugSepSepOctOctNovNovDecDecMorning boat rides along the south coast often encounter spinner dolphins. Maintain slow speeds and do not chase pods.
Sea Turtle Nesting
JanJanFebFebMarMarAprAprMayMayJunJunJulJulAugAugSepSepOctOctNovNovDecDecHawksbill and green turtles nest on select beaches. Observe from a distance and avoid lights at night.