Swell direction
NE to E trade-wind swell year-round; typhoon swells from any direction
East Side · Guam
Guam's east-side trade-wind buoy.
Get Ipan, Guam live dataFreeBuoy CDIP 121 · Ipan, Guam
CDIP buoy 121 sits off Ipan on the east coast of Guam, facing the open Pacific. It's the most-watched ocean instrument on the island — surfers, fishermen, divers, and the Coast Guard all check it. Year-round trade winds drive consistent NE-to-E swell; typhoon season (June through November) brings the bigger, longer-period events.
What you want to see on the buoy before you paddle out.
Swell direction
NE to E trade-wind swell year-round; typhoon swells from any direction
Swell period
8–14 s typical; 16–20 s+ during typhoon swells
Best for
East-coast reef breaks; check Surfline or local sources for spot-specific reports
Wind
Trade winds (E/ENE) dominate. Glassy days are rare outside the wet season.
Ipan is a regional buoy, not a single break — readings represent open-ocean swell hitting Guam's east coast. Local refraction varies by spot.
Guam sits in a Pacific swell crossroads — trade winds from the east, monsoonal influence from the west, typhoons from the south, and occasional north-Pacific storm tracks. CDIP 121 reads everything reaching the east coast. For Guam locals, it's the data feed before any ocean activity.
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