FZPQ50 PGUM 200518 SRFGUM Surf Zone Forecast for the Mariana Islands National Weather Service Tiyan GU 318 PM ChST Wed Aug 20 2025 .DISCUSSION...There will be a moderate risk of rip currents along east facing reefs through Thursday night, which could become low along all reefs Friday. There will also be a moderate risk of lightning through the weekend. $$ GUZ001-MPZ001>003-202030- Guam-Rota-Tinian-Saipan- 318 PM ChST Wed Aug 20 2025 36 hour Surf Zone Forecast for the Marianas from 600 PM Wednesday through 600 AM Friday .TONIGHT... Rip Current Risk.....Moderate *. Surf Height North facing reefs............1 to 3 feet. East facing reefs............4 to 5 feet. South facing reefs............1 to 2 feet. West facing reefs............Around 1 foot. Swell/Period Primary swell................East at 3 to 4 feet. Primary period...............8 seconds. Water Temperature Ritidian buoy..........86 Degrees. Winds...............Northeast at 10 to 15 mph. .THURSDAY... Rip Current Risk.....Moderate *. Surf Height North facing reefs............1 to 2 feet. East facing reefs............3 to 5 feet. South facing reefs............1 to 2 feet. West facing reefs............Around 1 foot. Swell/Period Primary swell................East at 2 to 3 feet. Primary period...............8 seconds. Max Heat Index.........Around 100. Winds...............Northeast to east at 10 to 15 mph. .THURSDAY NIGHT... Rip Current Risk.....Moderate *. Surf Height North facing reefs............1 to 2 feet. East facing reefs............3 to 5 feet. South facing reefs............1 to 2 feet. West facing reefs............Around 1 foot. Swell/Period Primary swell................East at 2 to 3 feet. Primary period...............8 seconds. Winds...............East at 10 to 15 mph. Tide information for the next 36 hours... At Apra Harbor, Guam... High tide 2.4 feet at 7:04 PM Wednesday Low tide 1.7 feet at 12:06 AM Thursday High tide 2.5 feet at 4:55 AM Thursday Low tide -0.2 feet at 12:25 PM Thursday High tide 2.5 feet at 7:41 PM Thursday Low tide 1.6 feet at 12:56 AM Friday High tide 2.5 feet at 5:56 AM Friday At Rota Island... High tide 2.3 feet at 7:01 PM Wednesday Low tide 1.6 feet at 12:00 AM Thursday High tide 2.3 feet at 4:52 AM Thursday Low tide -0.2 feet at 12:19 PM Thursday High tide 2.3 feet at 7:38 PM Thursday Low tide 1.5 feet at 12:50 AM Friday High tide 2.4 feet at 5:53 AM Friday At Tinian Island... High tide 1.6 feet at 6:54 PM Wednesday Low tide 1.3 feet at 10:58 PM Wednesday High tide 1.8 feet at 3:48 AM Thursday Low tide -0.4 feet at 11:54 AM Thursday High tide 1.6 feet at 7:27 PM Thursday Low tide 1.3 feet at 11:56 PM Thursday High tide 1.8 feet at 4:51 AM Friday At Tanapag Harbor, Saipan... High tide 2.2 feet at 7:20 PM Wednesday Low tide 1.6 feet at 11:52 PM Wednesday High tide 2.1 feet at 4:48 AM Thursday Low tide -0.4 feet at 12:25 PM Thursday High tide 2.2 feet at 7:56 PM Thursday Low tide 1.5 feet at 12:52 AM Friday High tide 2.2 feet at 5:54 AM Friday * 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. $$