Coastal Waters Forecast
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
922 FZMY50 PGUM 060604 CWFGUM Coastal Waters Forecast for the Mariana Islands National Weather Service Tiyan GU 404 PM ChST Sun Sep 6 2026 Marianas Waters out to 40 nautical miles PMZ150-062215- 404 PM ChST Sun Sep 6 2026 .Synopsis for Marianas Waters... Light to gentle northwesterlies will shift out of the north then the northeast through the work week. Combined seas of 3 to 5 ft tonight will subside to 3 to 4 ft on Monday. Isolated thunderstorms are forecasted through Monday. Scattered showers will taper down to isolated after midnight. Island-effect showers may be a concern tomorrow afternoon for southern coastal waters. $$ PMZ151>154-062215- MARIANAS COASTAL WATERS- 404 PM ChST Sun Sep 6 2026 .TONIGHT...Northwest wind 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: West 5 ft at 9 seconds and northwest 2 ft at 4 seconds. Scattered showers in the evening. Isolated thunderstorms. .MONDAY...North wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: West 4 ft at 9 seconds and north 2 ft at 4 seconds. Scattered showers in the afternoon. Isolated thunderstorms. .MONDAY NIGHT...North wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: West 4 ft at 9 seconds and north 2 ft at 4 seconds. .TUESDAY...North wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: Northwest 4 ft at 9 seconds and north 2 ft at 4 seconds. .TUESDAY NIGHT...North wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: Northwest 4 ft at 9 seconds and north 2 ft at 4 seconds. Scattered showers with isolated thunderstorms. .WEDNESDAY...Northeast wind 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: Northwest 4 ft at 10 seconds, northeast 2 ft at 4 seconds and northeast 2 ft at 9 seconds. A chance of showers with isolated thunderstorms. .THURSDAY...Northeast wind 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: Northwest 3 ft at 9 seconds, northeast 3 ft at 9 seconds and northeast 2 ft at 4 seconds. A chance of showers. .FRIDAY...North wind 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: Northeast 4 ft at 8 seconds, north 2 ft at 4 seconds and northwest 2 ft at 9 seconds. A chance of showers with a slight chance of thunderstorms. $$