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FZPQ50 PGUM 130727
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
527 PM ChST Mon Oct 13 2025

.DISCUSSION...There will be a moderate risk of rip currents along
north, east, and west facing reefs of the Marianas through at least
the next few days, spreading to south facing reefs Tuesday night as
the southerly swell energy increases. There will also be a moderate
risk of lightning starting tonight, lasting through at least midweek.

$$

GUZ001-MPZ001>003-132230-
Guam-Rota-Tinian-Saipan-
527 PM ChST Mon Oct 13 2025

36 hour Surf Zone Forecast for the Marianas from 600 PM Monday
through 600 AM Wednesday

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............5 to 7 feet.
      East  facing reefs............4 to 6 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............3 to 5 feet.
Swell/Period
      Primary swell................North at 3 to 5 feet.
      Primary period...............11 seconds.
      Secondary swell..............East at around 4 feet.
      Secondary period.............8 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Winds...............East at 10 to 15 mph.

.TUESDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 6 feet.
      East  facing reefs............4 to 6 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............3 to 5 feet.
Swell/Period
      Primary swell................East at around 4 feet.
      Primary period...............8 seconds.
      Secondary swell..............North at around 4 feet.
      Secondary period.............10 seconds.
Max Heat Index.........Around 101.
Winds...............East at 10 to 20 mph with occasional gusts to
30 mph.

.TUESDAY NIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............5 to 7 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............3 to 5 feet.
      West  facing reefs............4 to 6 feet.
Swell/Period
      Primary swell................Southeast at 3 to 5 feet.
      Primary period...............9 seconds.
      Secondary swell..............North at around 4 feet.
      Secondary period.............13 seconds.
Winds...............East at 15 to 20 mph with gusts to 30 mph near
heavier showers.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  1.7 feet at  7:22 PM Monday
High tide  2.0 feet at 11:19 PM Monday
Low  tide -0.2 feet at  7:25 AM Tuesday
High tide  2.2 feet at  3:36 PM Tuesday
Low  tide  1.6 feet at  8:57 PM Tuesday
High tide  1.9 feet at 12:45 AM Wednesday

At Rota Island...
Low  tide  1.6 feet at  7:16 PM Monday
High tide  1.9 feet at 11:16 PM Monday
Low  tide -0.2 feet at  7:19 AM Tuesday
High tide  2.1 feet at  3:33 PM Tuesday
Low  tide  1.5 feet at  8:51 PM Tuesday
High tide  1.8 feet at 12:42 AM Wednesday

At Tinian Island...
Low  tide  1.3 feet at  6:36 PM Monday
High tide  1.6 feet at 10:36 PM Monday
Low  tide -0.4 feet at  7:08 AM Tuesday
High tide  1.6 feet at  3:19 PM Tuesday
Low  tide  1.3 feet at  8:03 PM Tuesday
High tide  1.5 feet at 11:52 PM Tuesday

At Tanapag Harbor, Saipan...
Low  tide  1.7 feet at  7:46 PM Monday
High tide  1.9 feet at 11:17 PM Monday
Low  tide -0.2 feet at  7:34 AM Tuesday
High tide  2.2 feet at  3:48 PM Tuesday
Low  tide  1.6 feet at  9:20 PM Tuesday
High tide  1.8 feet at 12:46 AM Wednesday

* 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.

$$