FZPQ50 PGUM 121850 SRFGUM Surf Zone Forecast for the Mariana Islands National Weather Service Tiyan GU 450 AM ChST Sat Dec 13 2025 .DISCUSSION...There will be a high risk of rip currents along east facing reefs this weekend, which will then spread to north facing reefs Sunday and require a high surf advisory. $$ GUZ001-MPZ001>003-131000- Guam-Rota-Tinian-Saipan- 450 AM ChST Sat Dec 13 2025 36 hour Surf Zone Forecast for the Marianas from 600 AM Saturday through 600 PM Sunday .TODAY... Rip Current Risk.....High *. Surf Height North facing reefs............6 to 8 feet. East facing reefs............7 to 9 feet. South facing reefs............2 to 4 feet. West facing reefs............2 to 4 feet. Swell/Period Primary swell................Northeast at 4 to 6 feet. Primary period...............8 seconds. Secondary swell..............Northeast at around 3 feet. Secondary period.............9 seconds. Water Temperature Ritidian buoy..........85 Degrees. Max Heat Index.........Around 100. Winds...............East at 10 to 20 mph. .TONIGHT... Rip Current Risk.....High *. Surf Height North facing reefs............6 to 8 feet. East facing reefs............8 to 10 feet. South facing reefs............2 to 4 feet. West facing reefs............2 to 4 feet. Swell/Period Primary swell................Northeast at 4 to 6 feet. Primary period...............8 seconds. Secondary swell..............Northeast at around 3 feet. Secondary period.............8 seconds. Winds...............Breezy. East at 15 to 25 mph. .SUNDAY... Rip Current Risk.....High. Pounding surf will produce life threatening rip currents at reefs and beaches. Surf Height North facing reefs............7 to 9 feet. East facing reefs............8 to 10 feet. South facing reefs............2 to 4 feet. West facing reefs............2 to 4 feet. Swell/Period Primary swell................Northeast at 5 to 7 feet. Primary period...............8 seconds. Max Heat Index.........Around 100. Winds...............Breezy. East at 15 to 25 mph. Tide information for the next 36 hours... At Apra Harbor, Guam... Low tide 0.6 feet at 8:05 AM Saturday High tide 2.1 feet at 3:03 PM Saturday Low tide 0.5 feet at 10:02 PM Saturday High tide 1.4 feet at 4:00 AM Sunday Low tide 0.9 feet at 9:03 AM Sunday High tide 2.1 feet at 3:33 PM Sunday Low tide 0.2 feet at 10:46 PM Sunday At Rota Island... Low tide 0.5 feet at 7:59 AM Saturday High tide 2.0 feet at 3:00 PM Saturday Low tide 0.5 feet at 9:56 PM Saturday High tide 1.3 feet at 3:57 AM Sunday Low tide 0.8 feet at 8:57 AM Sunday High tide 1.9 feet at 3:30 PM Sunday Low tide 0.2 feet at 10:40 PM Sunday At Tinian Island... Low tide 0.2 feet at 7:42 AM Saturday High tide 1.5 feet at 3:01 PM Saturday Low tide 0.2 feet at 9:39 PM Saturday High tide 1.0 feet at 3:58 AM Sunday Low tide 0.3 feet at 8:40 AM Sunday High tide 1.5 feet at 3:31 PM Sunday Low tide 0.1 feet at 10:23 PM Sunday At Tanapag Harbor, Saipan... Low tide 0.8 feet at 8:17 AM Saturday High tide 2.1 feet at 3:12 PM Saturday Low tide 0.6 feet at 10:19 PM Saturday High tide 1.5 feet at 4:33 AM Sunday Low tide 1.1 feet at 9:15 AM Sunday High tide 2.1 feet at 3:43 PM Sunday Low tide 0.4 feet at 10:56 PM Sunday * 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. $$