FZPQ50 PGUM 191916 SRFGUM Surf Zone Forecast for the Mariana Islands National Weather Service Tiyan GU 516 AM ChST Fri Mar 20 2026 .DISCUSSION...Building northeast to east swell, reinforced by diminishing long-period north to northeast swells, produced by distant low pressure systems, will continue to produce hazardous surf along north facing reefs, and a high risk of rip currents along north and east facing reefs through this afternoon. The long-period swells are gradually subsiding and surf is decreasing, however, surf and rip risk will remain at elevated levels over the weekend, possibly hovering around hazardous levels for north facing reefs. A moderate risk of rip currents will continue along west and south facing reefs through at least Saturday. $$ GUZ001-MPZ001>003-201030- Guam-Rota-Tinian-Saipan- 516 AM ChST Fri Mar 20 2026 ...HIGH SURF ADVISORY IN EFFECT UNTIL 4 PM CHST THIS AFTERNOON ALONG NORTH FACING REEFS... ...HIGH RISK OF RIP CURRENTS UNTIL 4 PM CHST THIS AFTERNOON ALONG NORTH FACING REEFS... 36 hour Surf Zone Forecast for the Marianas from 600 AM Friday through 600 PM Saturday .TODAY... Rip Current Risk.....High *. Surf Height North facing reefs............8 to 10 feet. East facing reefs............7 to 9 feet. South facing reefs............4 to 6 feet. West facing reefs............4 to 6 feet. Swell/Period Primary swell................Northeast at 5 to 7 feet. Primary period...............8 seconds. Secondary swell..............Northeast at 5 to 6 feet. Secondary period.............13 seconds. Water Temperature Ipan buoy..........81 Degrees. Winds...............Northeast at 15 to 20 mph. .TONIGHT... Rip Current Risk.....High *. Surf Height North facing reefs............6 to 9 feet. East facing reefs............7 to 9 feet. South facing reefs............4 to 6 feet. West facing reefs............3 to 5 feet. Swell/Period Primary swell................Northeast at 4 to 6 feet. Primary period...............8 seconds. Secondary swell..............Northeast at 4 to 5 feet. Secondary period.............13 seconds. Winds...............Northeast at 10 to 20 mph. .SATURDAY... Rip Current Risk.....High *. Surf Height North facing reefs............7 to 9 feet. East facing reefs............8 to 10 feet. South facing reefs............4 to 6 feet. West facing reefs............3 to 5 feet. Swell/Period Primary swell................Northeast at 5 to 7 feet. Primary period...............8 seconds. Secondary swell..............North at 4 to 5 feet. Secondary period.............14 seconds. Max Heat Index.........Around 93. Winds...............Breezy. East at 15 to 20 mph. Tide information for the next 36 hours... At Apra Harbor, Guam... High tide 2.4 feet at 8:18 AM Friday Low tide 0.3 feet at 2:41 PM Friday High tide 2.4 feet at 8:49 PM Friday Low tide 0.6 feet at 2:56 AM Saturday High tide 2.4 feet at 8:43 AM Saturday Low tide 0.0 feet at 3:22 PM Saturday High tide 2.3 feet at 9:45 PM Saturday At Rota Island... High tide 2.2 feet at 8:15 AM Friday Low tide 0.3 feet at 2:35 PM Friday High tide 2.2 feet at 8:46 PM Friday Low tide 0.6 feet at 2:50 AM Saturday High tide 2.3 feet at 8:40 AM Saturday Low tide 0.0 feet at 3:16 PM Saturday High tide 2.2 feet at 9:42 PM Saturday At Tinian Island... High tide 1.8 feet at 8:16 AM Friday Low tide 0.1 feet at 2:18 PM Friday High tide 1.8 feet at 8:47 PM Friday Low tide 0.2 feet at 2:33 AM Saturday High tide 1.8 feet at 8:41 AM Saturday Low tide 0.0 feet at 2:59 PM Saturday High tide 1.7 feet at 9:43 PM Saturday At Tanapag Harbor, Saipan... High tide 2.1 feet at 8:23 AM Friday Low tide 0.3 feet at 2:42 PM Friday High tide 2.1 feet at 9:03 PM Friday Low tide 0.7 feet at 2:59 AM Saturday High tide 2.1 feet at 8:45 AM Saturday Low tide 0.1 feet at 3:23 PM Saturday High tide 2.1 feet at 10:05 PM Saturday * 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. $$