078
FZPQ50 PGUM 040600
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
400 PM ChST Mon Aug 4 2025

.DISCUSSION...A moderate risk of rip currents is expected along east
facing reefs through Tuesday. The surf is expected to diminish to
below 5 feet by Tuesday afternoon, allowing the risk of rip currents
to drop to low. Surf may rise by the weekend along east facing reefs
as the trade-wind swell builds. There will be a moderate risk of
lightning through the end of the week.

$$

GUZ001-MPZ001>003-042100-
Guam-Rota-Tinian-Saipan-
400 PM ChST Mon Aug 4 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............3 to 5 feet.
      South facing reefs............1 to 3 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 2 to 4 feet.
      Primary period...............8 seconds.
      Secondary swell..............West at around 2 feet.
      Secondary period.............9 seconds.
Water Temperature
  Ritidian buoy..........86 Degrees.
Winds...............East at 10 to 15 mph.

.TUESDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............2 to 4 feet.
      East  facing reefs............3 to 5 feet.
      South facing reefs............1 to 3 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 2 to 4 feet.
      Primary period...............8 seconds.
      Secondary swell..............West at around 2 feet.
      Secondary period.............8 seconds.
Max Heat Index.........Around 100.
Winds...............East at 10 to 15 mph.

.TUESDAY NIGHT...
Rip Current Risk.....Low *.
Surf Height
      North facing reefs............1 to 3 feet.
      East  facing reefs............2 to 4 feet.
      South facing reefs............1 to 3 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 2 to 3 feet.
      Primary period...............8 seconds.
      Secondary swell..............West at around 2 feet.
      Secondary period.............8 seconds.
Winds...............East at 10 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  2.1 feet at  6:01 PM Monday
Low  tide  1.9 feet at 10:14 PM Monday
High tide  2.2 feet at  2:54 AM Tuesday
Low  tide  0.2 feet at 10:49 AM Tuesday
High tide  2.2 feet at  6:46 PM Tuesday
Low  tide  1.8 feet at 11:22 PM Tuesday

At Rota Island...
High tide  2.0 feet at  5:58 PM Monday
Low  tide  1.7 feet at 10:08 PM Monday
High tide  2.1 feet at  2:51 AM Tuesday
Low  tide  0.2 feet at 10:43 AM Tuesday
High tide  2.1 feet at  6:43 PM Tuesday
Low  tide  1.7 feet at 11:16 PM Tuesday

At Tinian Island...
High tide  1.4 feet at  6:21 PM Monday
Low  tide  1.4 feet at  8:56 PM Monday
High tide  1.6 feet at  1:49 AM Tuesday
Low  tide -0.1 feet at 10:34 AM Tuesday
High tide  1.5 feet at  6:57 PM Tuesday
Low  tide  1.4 feet at 10:02 PM Tuesday

At Tanapag Harbor, Saipan...
High tide  1.7 feet at  6:47 PM Monday
Low  tide  1.7 feet at  9:13 PM Monday
High tide  2.0 feet at  2:17 AM Tuesday
Low  tide  0.0 feet at 10:58 AM Tuesday
High tide  1.8 feet at  7:25 PM Tuesday
Low  tide  1.7 feet at 10:30 PM Tuesday

* 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.

$$