977
FZPQ50 PGUM 180626
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
426 PM ChST Mon Aug 18 2025

.DISCUSSION...There will be a moderate risk of rip currents along
east facing reefs for the next few days and remain low along all
other reefs. Swell and surf will gradually subside starting Tuesday
night, allowing the rip current risk to become low along all reefs
by the end of the week. There will be a moderate risk of lightning
through at least Wednesday.

$$

GUZ001-MPZ001>003-182200-
Guam-Rota-Tinian-Saipan-
426 PM ChST Mon Aug 18 2025

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

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............2 to 4 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............Around 1 foot.
Swell/Period
      Primary swell................East at 4 to 5 feet.
      Primary period...............8 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Winds...............Breezy. East at 15 to 25 mph. Gusts to
                      35 mph possible near heavier showers.

.TUESDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............2 to 4 feet.
      East  facing reefs............6 to 7 feet.
      South facing reefs............3 to 4 feet.
      West  facing reefs............Around 1 foot.
Swell/Period
      Primary swell................East at around 5 feet.
      Primary period...............8 seconds.
Max Heat Index.........Around 102.
Winds...............Breezy at times. Southeast at 15 to 25 mph.

.TUESDAY NIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............2 to 4 feet.
      East  facing reefs............5 to 6 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............Around 1 foot.
Swell/Period
      Primary swell................East at 3 to 5 feet.
      Primary period...............8 seconds.
Winds...............Southeast at 10 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  2.3 feet at  5:20 PM Monday
Low  tide  1.9 feet at  9:43 PM Monday
High tide  2.4 feet at  2:28 AM Tuesday
Low  tide -0.2 feet at 10:28 AM Tuesday
High tide  2.4 feet at  6:19 PM Tuesday
Low  tide  1.9 feet at 11:04 PM Tuesday
High tide  2.4 feet at  3:44 AM Wednesday

At Rota Island...
High tide  2.1 feet at  5:17 PM Monday
Low  tide  1.8 feet at  9:37 PM Monday
High tide  2.3 feet at  2:25 AM Tuesday
Low  tide -0.2 feet at 10:22 AM Tuesday
High tide  2.2 feet at  6:16 PM Tuesday
Low  tide  1.7 feet at 10:58 PM Tuesday
High tide  2.3 feet at  3:41 AM Wednesday

At Tinian Island...
High tide  1.5 feet at  5:22 PM Monday
Low  tide  1.4 feet at  8:35 PM Monday
High tide  1.8 feet at  1:35 AM Tuesday
Low  tide -0.4 feet at 10:06 AM Tuesday
High tide  1.6 feet at  6:14 PM Tuesday
Low  tide  1.4 feet at  9:53 PM Tuesday
High tide  1.8 feet at  2:40 AM Wednesday

At Tanapag Harbor, Saipan...
High tide  2.0 feet at  5:42 PM Monday
Low  tide  1.7 feet at  9:32 PM Monday
High tide  2.2 feet at  2:07 AM Tuesday
Low  tide -0.4 feet at 10:33 AM Tuesday
High tide  2.1 feet at  6:37 PM Tuesday
Low  tide  1.7 feet at 10:49 PM Tuesday
High tide  2.1 feet at  3:28 AM 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.

$$