929
FZPQ50 PGUM 300600
SRFGUM

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

.DISCUSSION...A moderate risk of rip current remains for north
and east facing reefs. This is expected to diminish by Wednesday
This will put the risk of rip currents at low for all reefs.
Surf and risk of rip currents is expected to be minimal for the
rest of the week. There is a moderate risk of lightning through
Wednesday. A short lull in lightning potential is expected for
Wednesday night through Thursday night, then the risk will
increase for the weekend and beginning part of next week.

$$

GUZ001-MPZ001>003-301945-
Guam-Rota-Tinian-Saipan-
400 PM ChST Tue Sep 30 2025

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

.TONIGHT...
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 3 feet.
      Primary period...............9 seconds.
      Secondary swell..............East at around 3 feet.
      Secondary period.............9 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Winds...............Light and variable becoming northeast around
10 mph after midnight.

.WEDNESDAY...
Rip Current Risk.....Low *.
Surf Height
      North facing reefs............3 to 4 feet.
      East  facing reefs............3 to 4 feet.
      South facing reefs............1 to 2 feet.
      West  facing reefs............1 to 3 feet.
Swell/Period
      Primary swell................East at 2 to 3 feet.
      Primary period...............9 seconds.
      Secondary swell..............North at around 2 feet.
      Secondary period.............9 seconds.
Max Heat Index.........Around 101.
Winds...............East at around 10 mph.

.WEDNESDAY NIGHT...
Rip Current Risk.....Low *.
Surf Height
      North facing reefs............3 to 4 feet.
      East  facing reefs............3 to 4 feet.
      South facing reefs............1 to 2 feet.
      West  facing reefs............1 to 3 feet.
Swell/Period
      Primary swell................East at 2 to 3 feet.
      Primary period...............9 seconds.
      Secondary swell..............North at around 2 feet.
      Secondary period.............9 seconds.
Winds...............East at around 10 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
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
High tide  1.8 feet at  1:41 AM Thursday

At Rota Island...
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
High tide  1.7 feet at  1:38 AM Thursday

At Tinian Island...
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
High tide  1.4 feet at 12:33 AM Thursday

At Tanapag Harbor, Saipan...
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
High tide  1.7 feet at  1:15 AM Thursday

* 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.

$$