889
FZPQ50 PGUM 200518
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
318 PM ChST Wed Aug 20 2025

.DISCUSSION...There will be a moderate risk of rip currents along
east facing reefs through Thursday night, which could become low
along all reefs Friday. There will also be a moderate risk of
lightning through the weekend.

$$

GUZ001-MPZ001>003-202030-
Guam-Rota-Tinian-Saipan-
318 PM ChST Wed Aug 20 2025

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

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............1 to 3 feet.
      East  facing reefs............4 to 5 feet.
      South facing reefs............1 to 2 feet.
      West  facing reefs............Around 1 foot.
Swell/Period
      Primary swell................East at 3 to 4 feet.
      Primary period...............8 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Winds...............Northeast at 10 to 15 mph.

.THURSDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............1 to 2 feet.
      East  facing reefs............3 to 5 feet.
      South facing reefs............1 to 2 feet.
      West  facing reefs............Around 1 foot.
Swell/Period
      Primary swell................East at 2 to 3 feet.
      Primary period...............8 seconds.
Max Heat Index.........Around 100.
Winds...............Northeast to east at 10 to 15 mph.

.THURSDAY NIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............1 to 2 feet.
      East  facing reefs............3 to 5 feet.
      South facing reefs............1 to 2 feet.
      West  facing reefs............Around 1 foot.
Swell/Period
      Primary swell................East at 2 to 3 feet.
      Primary period...............8 seconds.
Winds...............East at 10 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  2.4 feet at  7:04 PM Wednesday
Low  tide  1.7 feet at 12:06 AM Thursday
High tide  2.5 feet at  4:55 AM Thursday
Low  tide -0.2 feet at 12:25 PM Thursday
High tide  2.5 feet at  7:41 PM Thursday
Low  tide  1.6 feet at 12:56 AM Friday
High tide  2.5 feet at  5:56 AM Friday

At Rota Island...
High tide  2.3 feet at  7:01 PM Wednesday
Low  tide  1.6 feet at 12:00 AM Thursday
High tide  2.3 feet at  4:52 AM Thursday
Low  tide -0.2 feet at 12:19 PM Thursday
High tide  2.3 feet at  7:38 PM Thursday
Low  tide  1.5 feet at 12:50 AM Friday
High tide  2.4 feet at  5:53 AM Friday

At Tinian Island...
High tide  1.6 feet at  6:54 PM Wednesday
Low  tide  1.3 feet at 10:58 PM Wednesday
High tide  1.8 feet at  3:48 AM Thursday
Low  tide -0.4 feet at 11:54 AM Thursday
High tide  1.6 feet at  7:27 PM Thursday
Low  tide  1.3 feet at 11:56 PM Thursday
High tide  1.8 feet at  4:51 AM Friday

At Tanapag Harbor, Saipan...
High tide  2.2 feet at  7:20 PM Wednesday
Low  tide  1.6 feet at 11:52 PM Wednesday
High tide  2.1 feet at  4:48 AM Thursday
Low  tide -0.4 feet at 12:25 PM Thursday
High tide  2.2 feet at  7:56 PM Thursday
Low  tide  1.5 feet at 12:52 AM Friday
High tide  2.2 feet at  5:54 AM Friday

* 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.

$$