Coastal Waters Forecast
Issued by NWS Tiyan, Guam

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818
FZMY50 PGUM 180108 CCA
CWFGUM

Coastal Waters Forecast for the Mariana Islands...CORRECTED
National Weather Service Tiyan GU
1108 AM ChST Sat Oct 18 2025

Marianas Waters out to 40 nautical miles

PMZ150-180900-
1108 AM ChST Sat Oct 18 2025

.Synopsis for Marianas Waters...
Moderate to fresh trade winds are expected through Sunday, tapering
down thereafter as the pressure gradient between the tropics and
mid-latitudes decreases. Combined seas of 6 to 8 feet will stay
elevated and choppy through at least the weekend, as northerly
swells and trade swell continue to mix in, before tapering down by
the middle of next week.

$$

PMZ151>154-180900-
MARIANAS COASTAL WATERS-
1108 AM ChST Sat Oct 18 2025

Corrected typo in today`s forecast.

.TODAY...East wind 15 to 20 kt with occasional gusts to 25 kt. Seas
5 to 7 ft. Wave Detail: East 5 ft at 9 seconds, east 3 ft at 5
seconds and north 3 ft at 12 seconds. Scattered showers and isolated
thunderstorms.
.TONIGHT...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail:
East 5 ft at 9 seconds, east 4 ft at 6 seconds and north 3 ft at
11 seconds.
.SUNDAY...East wind 15 to 20 kt. Seas 5 to 7 ft. Wave Detail:
East 6 ft at 8 seconds, east 3 ft at 5 seconds and north 3 ft at
10 seconds.
.SUNDAY NIGHT...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave
Detail: East 5 ft at 8 seconds, east 3 ft at 5 seconds and north
2 ft at 10 seconds. Scattered showers.
.MONDAY...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
East 5 ft at 8 seconds, north 4 ft at 13 seconds and east 2 ft at
4 seconds. A chance of showers.
.TUESDAY...Southeast wind 10 to 15 kt. Seas 6 to 8 ft. Wave
Detail: East 5 ft at 9 seconds, north 4 ft at 13 seconds and
southeast 2 ft at 4 seconds. A chance of showers.
.WEDNESDAY...Southeast wind 10 kt. Seas 5 to 7 ft. Wave Detail:
East 5 ft at 9 seconds, north 3 ft at 12 seconds and southeast 2
ft at 4 seconds. A chance of showers.

$$