FZMY50 PGUM 250547

CWFGUM



Coastal Waters Forecast for the Mariana Islands

National Weather Service Tiyan GU

347 PM ChST Sat Oct 25 2025



Marianas Waters out to 40 nautical miles



PMZ150-252100-

347 PM ChST Sat Oct 25 2025



.Synopsis for Marianas Waters...

Gentle to moderate easterlies will prevail across the region the 

next several days. Combined seas of 4 to 6 feet, comprised of a 

dominant trade swell, a weak northerly swell and wind waves, are 

expected to persist through most of next week. A few thunderstorms

are possible through Sunday night.



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PMZ151>154-252100-

MARIANAS COASTAL WATERS-

347 PM ChST Sat Oct 25 2025



.TONIGHT...Southeast wind 5 to 10 kt. Seas around 5 to 6 ft. Wave

Detail: East 5 ft at 9 seconds, southeast 2 ft at 4 seconds and 

north 2 ft at 10 seconds. Scattered showers with isolated 

thunderstorms.

.SUNDAY...East wind 5 to 10 kt. Seas 5 to 6 ft. Wave Detail:

East 5 ft at 9 seconds, east 2 ft at 4 seconds and north 2 ft at 

9 seconds. Scattered showers with isolated thunderstorms.

.SUNDAY NIGHT...East wind 10 to 15 kt. Seas around 6 ft. Wave

Detail: East 5 ft at 9 seconds, east 3 ft at 4 seconds and north 

2 ft at 9 seconds. Isolated thunderstorms. 

.MONDAY AND MONDAY NIGHT...East wind 10 to 15 kt. Seas around 6 

ft. Wave Detail: East 5 ft at 9 seconds, east 3 ft at 4 seconds 

and north 2 ft at 9 seconds. 

.TUESDAY...East wind 10 to 15 kt. Seas 5 to 6 ft. Wave Detail:

East 5 ft at 9 seconds, east 3 ft at 4 seconds and north 2 ft at 

9 seconds. 

.WEDNESDAY...East wind 10 kt. Seas 4 to 6 ft. Wave Detail:

East 5 ft at 8 seconds, east 2 ft at 4 seconds and north 2 ft at 

9 seconds. A slight chance of thunderstorms. 

.THURSDAY...East wind 10 kt. Seas 4 to 6 ft. Wave Detail:

East 5 ft at 8 seconds, east 2 ft at 4 seconds and north 2 ft at 

9 seconds. A chance of showers with a slight chance of 

thunderstorms. 



$$