Coastal Waters Forecast
Issued by NWS Tiyan, Guam

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049
FZMY50 PGUM 290719
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
519 PM ChST Fri Aug 29 2025

Marianas Waters out to 40 nautical miles

PMZ150-292000-
519 PM ChST Fri Aug 29 2025

.Synopsis for Marianas Waters...Gentle to moderate east-
southeasterlies, along with gusty conditions within showers, are
expected through the weekend. Combined seas of 5 to 7 feet are
expected to taper down a foot over the weekend, to then diminish
another 2 feet by midweek as trade swell and wind waves diminish.

$$

PMZ151>154-292000-
MARIANAS COASTAL WATERS-
519 PM ChST Fri Aug 29 2025

.TONIGHT...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
East 6 ft at 8 seconds and east 3 ft at 4 seconds. Scattered
showers with isolated thunderstorms.
.SATURDAY...Southeast wind 5 to 15 kt wih occasional gusts to 25
kt near heavier showers. Seas 5 to 7 ft. Wave Detail: East 6 ft at
8 seconds and southeast 3 ft at 4 seconds. Numerous showers with
isolated thunderstorms. Locally heavy showers possible.
.SATURDAY NIGHT...Southeast wind 10 to 20 kt with gusts to 30 kt
near heavier showers. Seas 5 to 6 ft. Wave Detail: East 6 ft at 8
seconds and southeast 4 ft at 4 seconds. Numerous heavy showers
with isolated thunderstorms.
.SUNDAY...Southeast wind 5 to 10 kt. Seas around 6 ft. Wave Detail:
Southeast 6 ft at 8 seconds and south 2 ft at 4 seconds.
Scattered showers with isolated thunderstorms.
.SUNDAY NIGHT...Southeast wind 5 to 10 kt. Seas 4 to 5 ft. Wave
Detail: East 5 ft at 8 seconds and southeast 2 ft at 4 seconds.
Scattered showers.
.MONDAY THROUGH WEDNESDAY...Southeast wind 5 to 15 kt. Seas 3 to
5 ft. Wave Detail: East 4 ft at 8 seconds and southeast 3 ft at 4
seconds. A chance of showers with a slight chance of
thunderstorms.

$$