205
FZPQ50 PGUM 291857
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
457 AM ChST Tue Sep 30 2025

.DISCUSSION...There is a moderate risk of rip currents along north
and east facing reefs and a low risk along south and west facing
reefs. As northerly swell subsides, the rip risk may drop to low for
north and east facing reefs as early as Thursday. A moderate risk of
lightning is expected through Wednesday.

$$

GUZ001-MPZ001>003-301000-
Guam-Rota-Tinian-Saipan-
457 AM ChST Tue Sep 30 2025

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

.TODAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 5 feet.
      East  facing reefs............4 to 5 feet.
      South facing reefs............1 to 2 feet.
      West  facing reefs............1 to 3 feet.
Swell/Period
      Primary swell................North at around 3 feet.
      Primary period...............9 seconds.
      Secondary swell..............East at around 3 feet.
      Secondary period.............9 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Max Heat Index.........Around 100.
Winds...............East at around 10 mph.

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 5 feet.
      East  facing reefs............4 to 5 feet.
      South facing reefs............1 to 2 feet.
      West  facing reefs............1 to 3 feet.
Swell/Period
      Primary swell................North at around 3 feet.
      Primary period...............9 seconds.
      Secondary swell..............East at around 3 feet.
      Secondary period.............9 seconds.
Winds...............Light and variable becoming east 5 to 10 mph
                    after midnight.

.WEDNESDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............3 to 5 feet.
      East  facing reefs............3 to 5 feet.
      South facing reefs............1 to 2 feet.
      West  facing reefs............1 to 3 feet.
Swell/Period
      Primary swell................Northeast at around 3 feet.
      Primary period...............8 seconds.
      Secondary swell..............North at around 2 feet.
      Secondary period.............9 seconds.
Max Heat Index.........Around 101.
Winds...............East at 10 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  0.2 feet at  7:09 AM Tuesday
High tide  2.0 feet at  3:42 PM Tuesday
Low  tide  1.7 feet at  8:45 PM Tuesday
High tide  1.8 feet at 12:08 AM Wednesday
Low  tide  0.2 feet at  8:20 AM Wednesday
High tide  2.1 feet at  4:38 PM Wednesday
Low  tide  1.6 feet at  9:58 PM Wednesday

At Rota Island...
Low  tide  0.2 feet at  7:03 AM Tuesday
High tide  1.9 feet at  3:39 PM Tuesday
Low  tide  1.6 feet at  8:39 PM Tuesday
High tide  1.7 feet at 12:05 AM Wednesday
Low  tide  0.2 feet at  8:14 AM Wednesday
High tide  1.9 feet at  4:35 PM Wednesday
Low  tide  1.5 feet at  9:52 PM Wednesday

At Tinian Island...
Low  tide  0.0 feet at  7:06 AM Tuesday
High tide  1.4 feet at  3:52 PM Tuesday
Low  tide  1.3 feet at  7:46 PM Tuesday
High tide  1.4 feet at 11:13 PM Tuesday
Low  tide -0.1 feet at  8:08 AM Wednesday
High tide  1.4 feet at  4:33 PM Wednesday
Low  tide  1.2 feet at  8:55 PM Wednesday

At Tanapag Harbor, Saipan...
Low  tide  0.3 feet at  7:26 AM Tuesday
High tide  1.8 feet at  4:09 PM Tuesday
Low  tide  1.7 feet at  8:32 PM Tuesday
High tide  1.7 feet at 11:54 PM Tuesday
Low  tide  0.2 feet at  8:33 AM Wednesday
High tide  1.9 feet at  4:58 PM Wednesday
Low  tide  1.6 feet at  9:55 PM 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.

$$