FZPQ50 PGUM 221844 SRFGUM Surf Zone Forecast for the Mariana Islands National Weather Service Tiyan GU 444 AM ChST Sun Aug 23 2026 .DISCUSSION...There will be a high risk of rip currents through at least this afternoon. There will also be a moderate risk of lightning through Thursday. $$ GUZ001-MPZ001>003-230945- Guam-Rota-Tinian-Saipan- 444 AM ChST Sun Aug 23 2026 ...HIGH SURF ADVISORY IN EFFECT UNTIL 4 PM CHST THIS AFTERNOON ALONG NORTH AND WEST FACING REEFS... ...HIGH RISK OF RIP CURRENTS UNTIL 4 PM CHST THIS AFTERNOON ALONG NORTH AND WEST FACING REEFS... 36 hour Surf Zone Forecast for the Marianas from 600 AM Sunday through 600 PM Monday .TODAY... Rip Current Risk.....High. Pounding surf will produce life threatening rip currents at reefs and beaches. Surf Height North facing reefs............7 to 10 feet. East facing reefs............5 to 7 feet. South facing reefs............6 to 8 feet. West facing reefs............7 to 10 feet. Swell/Period Primary swell................North at 6 to 7 feet. Primary period...............9 seconds. Secondary swell..............Southwest at around 6 feet. Secondary period.............9 seconds. Water Temperature Real Time Ocean Forecast System...87 Degrees. Max Heat Index.........Around 104. Winds...............Southwest at 15 to 20 mph. .TONIGHT... Rip Current Risk.....Moderate *. Surf Height North facing reefs............5 to 7 feet. East facing reefs............3 to 5 feet. South facing reefs............6 to 8 feet. West facing reefs............6 to 8 feet. Swell/Period Primary swell................Southwest at 4 to 6 feet. Primary period...............9 seconds. Secondary swell..............North at around 5 feet. Secondary period.............10 seconds. Winds...............Southwest at 10 to 20 mph. .MONDAY... Rip Current Risk.....High *. Surf Height North facing reefs............4 to 6 feet. East facing reefs............2 to 4 feet. South facing reefs............6 to 8 feet. West facing reefs............8 to 10 feet. Swell/Period Primary swell................Southwest at 6 to 8 feet. Primary period...............9 seconds. Secondary swell..............North at around 4 feet. Secondary period.............10 seconds. Max Heat Index.........Around 102. Winds...............Southwest at 10 to 20 mph. Tide information for the next 36 hours... At Apra Harbor, Guam... Low tide 0.3 feet at 10:21 AM Sunday High tide 2.1 feet at 6:18 PM Sunday Low tide 1.7 feet at 11:12 PM Sunday High tide 2.1 feet at 3:37 AM Monday 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 At Rota Island... Low tide 0.2 feet at 10:15 AM Sunday High tide 2.0 feet at 6:15 PM Sunday Low tide 1.6 feet at 11:06 PM Sunday High tide 1.9 feet at 3:34 AM Monday 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 At Tinian Island... Low tide 0.1 feet at 9:58 AM Sunday High tide 1.6 feet at 6:16 PM Sunday Low tide 0.6 feet at 10:49 PM Sunday High tide 1.5 feet at 3:35 AM Monday 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 At Tanapag Harbor, Saipan... Low tide 0.1 feet at 10:33 AM Sunday High tide 1.9 feet at 6:54 PM Sunday Low tide 1.7 feet at 10:40 PM Sunday High tide 1.9 feet at 3:06 AM Monday 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 * 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. $$