FZMY50 PGUM 200639
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
439 PM ChST Wed May 20 2026

Marianas Waters out to 40 nautical miles

PMZ150-202315-
439 PM ChST Wed May 20 2026

.Synopsis for Marianas Waters...
Moderate to fresh easterlies will prevail across the region
through the rest of the week, possibly dropping to moderate in a
few days. Combined seas of 6 to 8 feet will decrease by a foot or
two starting Thursday evening through the weekend.

$$

PMZ151>154-202315-
MARIANAS COASTAL WATERS-
439 PM ChST Wed May 20 2026

.TONIGHT...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail:
East 7 ft at 8 seconds and east 4 ft at 6 seconds. 
.THURSDAY...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail:
East 7 ft at 8 seconds and east 4 ft at 6 seconds. Scattered 
showers in the afternoon. 
.THURSDAY NIGHT...East wind 15 to 20 kt. Seas 5 to 7 ft. Wave 
Detail: East 6 ft at 8 seconds and east 3 ft at 5 seconds. 
Scattered showers. 
.FRIDAY...East wind 15 kt. Seas 5 to 7 ft. Wave Detail: East 6 ft
at 8 seconds and east 3 ft at 5 seconds. 
.FRIDAY NIGHT...East wind 15 kt. Seas 4 to 6 ft. Wave Detail:
East 5 ft at 8 seconds and east 3 ft at 5 seconds. 
.SATURDAY...East wind 15 kt. Seas 4 to 6 ft. Wave Detail: East
5 ft at 8 seconds and east 3 ft at 5 seconds. A slight chance of
showers and thunderstorms. 
.SUNDAY AND MONDAY...East wind 5 to 15 kt. Seas 4 to 6 ft.
Wave Detail: East 5 ft at 8 seconds and east 3 ft at 5 seconds. A
slight chance of showers and thunderstorms. 

$$