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FZPQ50 PGUM 181800
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
400 AM ChST Sat Jul 19 2025

.DISCUSSION...There is a moderate risk of rip currents along east
facing reefs of the Marianas through at least the weekend.
West-southwest swell may build starting tonight, potentially
increasing surf enough to produce a moderate risk of rip currents
along south and west facing reefs next week. A moderate risk
of lightning is expected through the weekend.

$$

GUZ001-MPZ001>003-190900-
Guam-Rota-Tinian-Saipan-
400 AM ChST Sat Jul 19 2025

36 hour Surf Zone Forecast for the Marianas from 600 AM Saturday
through 600 PM Sunday

.TODAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............3 to 4 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............1 to 3 feet.
      West  facing reefs............1 to 2 feet.
Swell/Period
      Primary swell................East at 3 to 5 feet.
      Primary period...............8 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Max Heat Index.........Around 100.
Winds...............East at 10 to 15 mph. Gusts to 25 mph
near showers.

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............3 to 4 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............2 to 3 feet.
      West  facing reefs............1 to 3 feet.
Swell/Period
      Primary swell................East at 3 to 5 feet.
      Primary period...............8 seconds.
      Secondary swell..............West at 1 to 2 feet.
      Secondary period.............8 seconds.
Winds...............East at 10 to 15 mph.

.SUNDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............2 to 4 feet.
      East  facing reefs............4 to 6 feet.
      South facing reefs............2 to 3 feet.
      West  facing reefs............2 to 3 feet.
Swell/Period
      Primary swell................East at 3 to 4 feet.
      Primary period...............8 seconds.
      Secondary swell..............West at 1 to 2 feet.
      Secondary period.............9 seconds.
Max Heat Index.........Around 103.
Winds...............Southeast at 10 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  0.4 feet at  8:40 AM Saturday
High tide  2.1 feet at  3:29 PM Saturday
Low  tide  1.6 feet at  8:09 PM Saturday
High tide  2.7 feet at  2:01 AM Sunday
Low  tide  0.1 feet at  9:41 AM Sunday
High tide  2.2 feet at  5:09 PM Sunday
Low  tide  1.8 feet at  9:24 PM Sunday

At Rota Island...
Low  tide  0.4 feet at  8:34 AM Saturday
High tide  2.0 feet at  3:26 PM Saturday
Low  tide  1.5 feet at  8:03 PM Saturday
High tide  2.5 feet at  1:58 AM Sunday
Low  tide  0.1 feet at  9:35 AM Sunday
High tide  2.1 feet at  5:06 PM Sunday
Low  tide  1.7 feet at  9:18 PM Sunday

At Tinian Island...
Low  tide  0.1 feet at  8:30 AM Saturday
High tide  1.2 feet at  3:29 PM Saturday
Low  tide  1.1 feet at  7:12 PM Saturday
High tide  1.9 feet at  1:20 AM Sunday
Low  tide -0.2 feet at  9:26 AM Sunday
High tide  1.4 feet at  5:14 PM Sunday
Low  tide  1.3 feet at  8:20 PM Sunday

At Tanapag Harbor, Saipan...
Low  tide  0.1 feet at  8:54 AM Saturday
High tide  1.6 feet at  3:54 PM Saturday
Low  tide  1.3 feet at  8:00 PM Saturday
High tide  2.3 feet at  1:53 AM Sunday
Low  tide -0.2 feet at  9:51 AM Sunday
High tide  1.8 feet at  5:35 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.

$$