164
FZPQ50 PGUM 180534
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
334 PM ChST Tue Nov 18 2025

.DISCUSSION...There will be a moderate risk of rip currents along
north and east facing reefs of the Marianas through at least
Wednesday night. Then, the trade swell is expected to build for
the rest of the week. This will allow the rip current risk to
increase to high. There is also a moderate risk of lightning
starting around Thursday night through Saturday night.

$$

GUZ001-MPZ001>003-182200-
Guam-Rota-Tinian-Saipan-
334 PM ChST Tue Nov 18 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............5 to 7 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.
Water Temperature
      Ritidian buoy..........86 Degrees.
Winds...............East at 10 to 20 mph.

.WEDNESDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............3 to 5 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................Northeast at 4 to 6 feet.
      Primary period...............8 seconds.
Max Heat Index.........Around 100.
Winds...............East at 10 to 20 mph.

.WEDNESDAY NIGHT...
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 5 to 7 feet.
      Primary period...............8 seconds.
Winds...............East at 10 to 20 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  2.1 feet at  5:52 PM Tuesday
Low  tide -0.2 feet at 12:58 AM Wednesday
High tide  2.0 feet at  7:55 AM Wednesday
Low  tide  1.3 feet at  1:08 PM Wednesday
High tide  2.1 feet at  6:14 PM Wednesday
Low  tide -0.4 feet at  1:26 AM Thursday
High tide  2.1 feet at  8:34 AM Thursday

At Rota Island...
High tide  2.0 feet at  5:49 PM Tuesday
Low  tide -0.2 feet at 12:52 AM Wednesday
High tide  1.9 feet at  7:52 AM Wednesday
Low  tide  1.2 feet at  1:02 PM Wednesday
High tide  2.0 feet at  6:11 PM Wednesday
Low  tide -0.3 feet at  1:20 AM Thursday
High tide  1.9 feet at  8:31 AM Thursday

At Tinian Island...
High tide  1.6 feet at  4:54 PM Tuesday
Low  tide -0.1 feet at 12:34 AM Wednesday
High tide  1.4 feet at  7:52 AM Wednesday
Low  tide  1.2 feet at 11:59 AM Wednesday
High tide  1.6 feet at  5:12 PM Wednesday
Low  tide -0.2 feet at  1:07 AM Thursday
High tide  1.5 feet at  8:45 AM Thursday

At Tanapag Harbor, Saipan...
High tide  2.1 feet at  5:53 PM Tuesday
Low  tide  0.0 feet at  1:00 AM Wednesday
High tide  2.0 feet at  8:13 AM Wednesday
Low  tide  1.5 feet at 12:55 PM Wednesday
High tide  2.1 feet at  6:11 PM Wednesday
Low  tide -0.1 feet at  1:31 AM Thursday
High tide  2.0 feet at  8:54 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.

$$