970
FZMY50 PGUM 161903
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
503 AM ChST Thu Sep 17 2026

Marianas Waters out to 40 nautical miles

PMZ150-171130-
503 AM ChST Thu Sep 17 2026

.Synopsis for Marianas Waters...
Gentle to moderate west to southwest winds will continue to
develop today and continue through at least Friday. Combined seas
of 5 to 8 ft will continue over the next couple of days. Scattered
showers and isolated thunderstorms are possible for the entire
forecast period.

$$

PMZ151-152-171130-
Guam Coastal Waters-Rota Coastal Waters-
503 AM ChST Thu Sep 17 2026

.TODAY...West wind 10 to 15 kt. Seas around 5 to 7 ft. Wave
Detail: Northeast 5 ft at 8 seconds, south 4 ft at 8 seconds and
west 3 ft at 4 seconds. Scattered showers with isolated
thunderstorms.
.TONIGHT...West wind 10 to 15 kt. Seas around 5 to 7 ft. Wave
Detail: Northeast 5 ft at 8 seconds, south 4 ft at 8 seconds and
west 2 ft at 4 seconds. Scattered showers with isolated
thunderstorms.
.FRIDAY...Southwest wind 10 to 15 kt. Seas 5 to 7 ft. Wave
Detail: North 4 ft at 8 seconds, southwest 4 ft at 9 seconds and
southwest 3 ft at 4 seconds. Scattered showers with isolated
thunderstorms.
.FRIDAY NIGHT...West wind 10 to 15 kt. Seas 5 to 7 ft. Wave
Detail: North 4 ft at 8 seconds, southwest 4 ft at 9 seconds and
west 3 ft at 4 seconds. Scattered showers with isolated
thunderstorms.
.SATURDAY THROUGH SUNDAY...Southwest wind 10 kt. Seas 6 to 8 ft.
Wave Detail: Southwest 5 ft at 8 seconds, southwest 4 ft at 8
seconds and southwest 2 ft at 4 seconds. A chance of showers with
a slight chance of thunderstorms.
.MONDAY...South wind 10 kt. Seas 6 to 8 ft. Wave Detail: Southwest
5 ft at 8 seconds, northwest 4 ft at 8 seconds, northeast 3 ft at
10 seconds and south 2 ft at 4 seconds. A chance of showers with
a slight chance of thunderstorms.

$$

PMZ153-154-171130-
Tinian Coastal Waters-Saipan Coastal Waters-
503 AM ChST Thu Sep 17 2026

.TODAY...West wind 10 to 15 kt. Seas around 6 to 7 ft. Wave
Detail: Northeast 6 ft at 8 seconds, south 4 ft at 8 seconds and
west 3 ft at 4 seconds. Scattered showers with isolated
thunderstorms.
.TONIGHT...West wind 10 to 15 kt. Seas around 6 to 7 ft. Wave
Detail: Northeast 5 ft at 9 seconds, south 4 ft at 8 seconds and
west 2 ft at 4 seconds. Scattered showers with isolated
thunderstorms.
.FRIDAY...Southwest wind 10 to 15 kt. Seas 5 to 7 ft. Wave
Detail: North 4 ft at 8 seconds, southwest 4 ft at 9 seconds and
southwest 3 ft at 4 seconds. Scattered showers with isolated
thunderstorms
.FRIDAY NIGHT...Southwest wind 10 to 15 kt. Seas 5 to 7 ft. Wave
Detail: North 4 ft at 8 seconds, southwest 4 ft at 9 seconds and
southwest 3 ft at 4 seconds. Scattered showers with isolated
thunderstorms.
.SATURDAY THROUGH SUNDAY...Southwest wind 10 kt. Seas 6 to 8 ft.
Wave Detail: Southwest 5 ft at 8 seconds, southwest 4 ft at 8
seconds and southwest 2 ft at 4 seconds. A chance of showers with
a slight chance of thunderstorms.
.MONDAY...South wind 10 kt. Seas 6 to 8 ft. Wave Detail: Southwest
5 ft at 8 seconds, northwest 4 ft at 8 seconds, northeast 3 ft at
10 seconds and southwest 2 ft at 4 seconds. A chance of showers
with a slight chance of thunderstorms.

$$