FZPQ50 PGUM 231915 SRFGUM Surf Zone Forecast for the Mariana Islands National Weather Service Tiyan GU 515 AM ChST Mon Aug 24 2026 .DISCUSSION... A High Surf Advisory and High Rip Current Risk Statement remain in effect through this afternoon. Significant southwesterly swell driven by the monsoon pattern and Tropical Depression 19W, well north-northwest of Yap, continues to produce hazardous surf and dangerous rip currents along west-facing reefs through this afternoon, potentially through tonight. A moderate risk of rip currents continues along north-,east-, and south-facing reefs over the next few days. There is a moderate risk of lightning for the next several days. $$ GUZ001-MPZ001>003-241100- Guam-Rota-Tinian-Saipan- 515 AM ChST Mon Aug 24 2026 ...HIGH SURF ADVISORY IN EFFECT UNTIL 4 PM CHST THIS AFTERNOON ALONG WEST FACING REEFS... ...HIGH RISK OF RIP CURRENTS UNTIL 4 PM CHST THIS AFTERNOON ALONG WEST FACING REEFS... 36 hour Surf Zone Forecast for the Marianas from 600 AM Monday through 600 PM Tuesday .TODAY... Rip Current Risk.....High *. Surf Height North facing reefs............4 to 6 feet. East facing reefs............3 to 5 feet. South facing reefs............5 to 7 feet. West facing reefs............8 to 9 feet. Swell/Period Primary swell................Southwest at 7 to 8 feet. Primary period...............10 seconds. Secondary swell..............North at 2 to 3 feet. Secondary period.............10 seconds. Tertiary swell...............Southeast at 2 to 3 feet. Tertiary period..............8 seconds. Water Temperature Pago Bay buoy..........84 Degrees. Max Heat Index.........Around 101. Winds...............Southwest at 10 to 15 mph with gusts to 25 mph near heavier showers. .TONIGHT... Rip Current Risk.....High *. Surf Height North facing reefs............4 to 6 feet. East facing reefs............3 to 5 feet. South facing reefs............5 to 7 feet. West facing reefs............around 8 feet. Swell/Period Primary swell................Southwest at 6 to 8 feet. Primary period...............10 seconds. Secondary swell..............North at 2 to 3 feet. Secondary period.............10 seconds. Tertiary swell...............East at around 2 feet. Tertiary period..............12 seconds. Winds...............Southwest at 10 to 15 mph with gusts to 25 mph near heavier showers. .TUESDAY... Rip Current Risk.....Moderate *. Surf Height North facing reefs............4 to 6 feet. East facing reefs............3 to 5 feet. South facing reefs............5 to 6 feet. West facing reefs............6 to 8 feet. Swell/Period Primary swell................Southwest at 5 to 7 feet. Primary period...............9 seconds. Secondary swell..............Northwest at 2 to 3 feet. Secondary period.............10 seconds. Tertiary swell...............East at around 2 feet. Tertiary period..............12 seconds. Max Heat Index.........Around 101. Winds...............Southwest at 5 to 15 mph. Tide information for the next 36 hours... At Apra Harbor, Guam... Low tide 0.2 feet at 11:14 AM Monday High tide 2.2 feet at 6:52 PM Monday Low tide 1.7 feet at 11:56 PM Monday High tide 2.2 feet at 4:40 AM Tuesday Low tide 0.1 feet at 12:00 PM Tuesday High tide 2.3 feet at 7:20 PM Tuesday Low tide 1.6 feet at 12:32 AM Wednesday At Rota Island... Low tide 0.2 feet at 11:08 AM Monday High tide 2.1 feet at 6:49 PM Monday Low tide 1.6 feet at 11:50 PM Monday High tide 2.0 feet at 4:37 AM Tuesday Low tide 0.1 feet at 11:54 AM Tuesday High tide 2.1 feet at 7:17 PM Tuesday Low tide 1.5 feet at 12:26 AM Wednesday At Tinian Island... Low tide 0.1 feet at 10:51 AM Monday High tide 1.6 feet at 6:50 PM Monday Low tide 0.5 feet at 11:33 PM Monday High tide 1.6 feet at 4:38 AM Tuesday Low tide 0.0 feet at 11:37 AM Tuesday High tide 1.7 feet at 7:18 PM Tuesday Low tide 0.5 feet at 12:09 AM Wednesday At Tanapag Harbor, Saipan... Low tide 0.1 feet at 11:19 AM Monday High tide 1.9 feet at 7:21 PM Monday Low tide 1.6 feet at 11:25 PM Monday High tide 1.9 feet at 4:28 AM Tuesday Low tide 0.0 feet at 12:02 PM Tuesday High tide 1.9 feet at 7:44 PM Tuesday Low tide 1.5 feet at 12:09 AM Wednesday * Low Risk of rip currents - Strong currents can still occur near jetties and reef channels. Always have a flotation device with you in the water. Moderate Risk of rip currents - Wave conditions support stronger or more frequent rip currents. Always have a flotation device with you in the water. High Risk of rip currents - Large waves will produce strong rip currents, especially along narrow reefs and beaches. Rip currents will be life threatening. If caught in a rip current, swim parallel to the beach rather than against the current. $$