014
FZPQ50 PGUM 171855
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
455 AM ChST Sat Oct 18 2025

.DISCUSSION...There will be a moderate risk of rip currents along
north and east facing reefs of the Marianas through at least the
middle of the week.

$$

GUZ001-MPZ001>003-181000-
Guam-Rota-Tinian-Saipan-
455 AM ChST Sat Oct 18 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............4 to 6 feet.
      East  facing reefs............6 to 8 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 4 to 6 feet.
      Primary period...............9 seconds.
      Secondary swell..............North at 2 to 3 feet.
      Secondary period.............12 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Max Heat Index.........Around 103.
Winds...............East at 10 to 20 mph.

.TONIGHT...
Rip Current Risk.....High *.
Surf Height
      North facing reefs............4 to 6 feet.
      East  facing reefs............6 to 8 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 4 to 6 feet.
      Primary period...............8 seconds.
      Secondary swell..............North at 2 to 3 feet.
      Secondary period.............11 seconds.
Winds...............East at 10 to 20 mph.

.SUNDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 6 feet.
      East  facing reefs............6 to 8 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 4 to 6 feet.
      Primary period...............8 seconds.
      Secondary swell..............North at 2 to 3 feet.
      Secondary period.............10 seconds.
Max Heat Index.........Around 102.
Winds...............East at 10 to 20 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  1.9 feet at  5:17 AM Saturday
Low  tide  0.4 feet at 11:36 AM Saturday
High tide  2.3 feet at  6:08 PM Saturday
Low  tide  0.6 feet at 12:26 AM Sunday
High tide  2.0 feet at  6:14 AM Sunday
Low  tide  0.6 feet at 12:18 PM Sunday
High tide  2.3 feet at  6:30 PM Sunday

At Rota Island...
High tide  1.8 feet at  5:14 AM Saturday
Low  tide  0.4 feet at 11:30 AM Saturday
High tide  2.1 feet at  6:05 PM Saturday
Low  tide  0.6 feet at 12:20 AM Sunday
High tide  1.9 feet at  6:11 AM Sunday
Low  tide  0.5 feet at 12:12 PM Sunday
High tide  2.1 feet at  6:27 PM Sunday

At Tinian Island...
Low  tide  0.2 feet at 10:51 AM Saturday
High tide  1.5 feet at  5:30 PM Saturday
Low  tide  0.5 feet at 11:47 PM Saturday
High tide  1.3 feet at  5:22 AM Sunday
Low  tide  0.4 feet at 11:32 AM Sunday
High tide  1.5 feet at  5:48 PM Sunday
Low  tide  0.3 feet at 12:26 AM Monday

At Tanapag Harbor, Saipan...
High tide  1.8 feet at  5:27 AM Saturday
Low  tide  0.5 feet at 11:36 AM Saturday
High tide  2.1 feet at  6:13 PM Saturday
Low  tide  0.7 feet at 12:22 AM Sunday
High tide  1.9 feet at  6:25 AM Sunday
Low  tide  0.6 feet at 12:17 PM Sunday
High tide  2.1 feet at  6:35 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.

$$