FZPQ50 PGUM 201831 SRFGUM Surf Zone Forecast for the Mariana Islands National Weather Service Tiyan GU 431 AM ChST Sun Jun 21 2026 .DISCUSSION...There will be a moderate risk of rip currents through at least Tuesday. There will be a moderate risk of lightning starting Monday night. $$ GUZ001-MPZ001>003-210945- Guam-Rota-Tinian-Saipan- 431 AM ChST Sun Jun 21 2026 36 hour Surf Zone Forecast for the Marianas from 600 AM Sunday through 600 PM Monday .TODAY... Rip Current Risk.....Moderate *. Surf Height North facing reefs............1 to 3 feet. East facing reefs............3 to 5 feet. South facing reefs............3 to 5 feet. West facing reefs............1 to 3 feet. Swell/Period Primary swell................East at 1 to 3 feet. Primary period...............8 seconds. Secondary swell..............Southeast at around 2 feet. Secondary period.............10 seconds. Water Temperature Ipan buoy..........84 Degrees. Max Heat Index.........Around 101. Winds...............Southeast at around 10 mph. .TONIGHT... Rip Current Risk.....Moderate *. Surf Height North facing reefs............1 to 3 feet. East facing reefs............3 to 5 feet. South facing reefs............3 to 5 feet. West facing reefs............1 to 3 feet. Swell/Period Primary swell................East at 1 to 3 feet. Primary period...............8 seconds. Secondary swell..............Southeast at around 2 feet. Secondary period.............10 seconds. Winds...............Light and variable. .MONDAY... Rip Current Risk.....Moderate *. Surf Height North facing reefs............1 to 3 feet. East facing reefs............3 to 5 feet. South facing reefs............3 to 5 feet. West facing reefs............1 to 3 feet. Swell/Period Primary swell................Southeast at 1 to 3 feet. Primary period...............8 seconds. Secondary swell..............Southwest at around 2 feet. Secondary period.............10 seconds. Max Heat Index.........Around 101. Winds...............Light and variable. Tide information for the next 36 hours... At Apra Harbor, Guam... Low tide 1.4 feet at 7:17 AM Sunday High tide 2.1 feet at 12:07 PM Sunday Low tide 0.6 feet at 6:46 PM Sunday High tide 2.6 feet at 1:46 AM Monday Low tide 1.1 feet at 8:20 AM Monday High tide 1.9 feet at 1:40 PM Monday Low tide 1.0 feet at 7:35 PM Monday At Rota Island... Low tide 1.3 feet at 7:11 AM Sunday High tide 2.0 feet at 12:04 PM Sunday Low tide 0.6 feet at 6:40 PM Sunday High tide 2.5 feet at 1:43 AM Monday Low tide 1.1 feet at 8:14 AM Monday High tide 1.8 feet at 1:37 PM Monday Low tide 0.9 feet at 7:29 PM Monday At Tinian Island... Low tide 0.5 feet at 6:54 AM Sunday High tide 1.6 feet at 12:05 PM Sunday Low tide 0.2 feet at 6:23 PM Sunday High tide 1.9 feet at 1:44 AM Monday Low tide 0.4 feet at 7:57 AM Monday High tide 1.4 feet at 1:38 PM Monday Low tide 0.3 feet at 7:12 PM Monday At Tanapag Harbor, Saipan... Low tide 1.0 feet at 7:44 AM Sunday High tide 1.6 feet at 12:27 PM Sunday Low tide 0.3 feet at 6:52 PM Sunday High tide 2.3 feet at 1:53 AM Monday Low tide 0.8 feet at 8:42 AM Monday High tide 1.5 feet at 1:54 PM Monday Low tide 0.7 feet at 7:38 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 ripcurrents, 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. $$