165
FZPQ50 PGUM 120721
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
521 PM ChST Sun Oct 12 2025

.DISCUSSION...There will be a moderate risk of rip currents along
north, east, and west facing reefs of the Marianas through at least
Monday night. A long-period north swell continues to generate
elevated surf along north facing reefs, wrapping around the islands
to maintain higher surf along east and west facing reefs as well. The
north swell and associated surf will gradually diminish through the
next few day or so, but maintain caution as narrow reefs and channels
may still see strong rip currents develop. Another pulse of long-
period north swell looks to arrive by the end of the week.

$$

GUZ001-MPZ001>003-122230-
Guam-Rota-Tinian-Saipan-
521 PM ChST Sun Oct 12 2025

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

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............6 to 8 feet.
      East  facing reefs............4 to 6 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............4 to 6 feet.
Swell/Period
      Primary swell................North at 3 to 5 feet.
      Primary period...............12 seconds.
      Secondary swell..............East at around 3 feet.
      Secondary period.............8 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Winds...............East at 10 to 15 mph.

.MONDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............5 to 7 feet.
      East  facing reefs............3 to 5 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............3 to 5 feet.
Swell/Period
      Primary swell................North at 3 to 4 feet.
      Primary period...............12 seconds.
      Secondary swell..............East at around 4 feet.
      Secondary period.............8 seconds.
Max Heat Index.........Around 102.
Winds...............East at 10 to 15 mph.

.MONDAY NIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............5 to 6 feet.
      East  facing reefs............3 to 5 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............3 to 5 feet.
Swell/Period
      Primary swell................North at 3 to 4 feet.
      Primary period...............11 seconds.
      Secondary swell..............East at around 4 feet.
      Secondary period.............8 seconds.
Winds...............East at 10 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  1.7 feet at  5:53 PM Sunday
High tide  2.2 feet at 10:18 PM Sunday
Low  tide -0.4 feet at  6:14 AM Monday
High tide  2.2 feet at  2:22 PM Monday
Low  tide  1.7 feet at  7:22 PM Monday
High tide  2.0 feet at 11:19 PM Monday

At Rota Island...
Low  tide  1.6 feet at  5:47 PM Sunday
High tide  2.1 feet at 10:15 PM Sunday
Low  tide -0.4 feet at  6:08 AM Monday
High tide  2.1 feet at  2:19 PM Monday
Low  tide  1.6 feet at  7:16 PM Monday
High tide  1.9 feet at 11:16 PM Monday

At Tinian Island...
Low  tide  1.4 feet at  5:14 PM Sunday
High tide  1.7 feet at  9:35 PM Sunday
Low  tide -0.5 feet at  6:01 AM Monday
High tide  1.6 feet at  2:21 PM Monday
Low  tide  1.3 feet at  6:36 PM Monday
High tide  1.6 feet at 10:36 PM Monday

At Tanapag Harbor, Saipan...
Low  tide  1.7 feet at  6:14 PM Sunday
High tide  2.0 feet at 10:12 PM Sunday
Low  tide -0.3 feet at  6:24 AM Monday
High tide  2.2 feet at  2:34 PM Monday
Low  tide  1.7 feet at  7:46 PM Monday
High tide  1.9 feet at 11:17 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 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.

$$