960
FZPQ50 PGUM 090722
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
522 PM ChST Tue Dec 9 2025

.DISCUSSION...A moderate risk of rip currents is expected along north
and east facing reefs of the Marianas for at least the next few days,
before surf becomes hazardous along north facing reefs potentially by
Thursday or Thursday night as a shearline continues to descend toward
the Marianas.

$$

GUZ001-MPZ001>003-092000-
Guam-Rota-Tinian-Saipan-
522 PM ChST Tue Dec 9 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............6 to 8 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............1 to 3 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 4 to 5 feet.
      Primary period...............9 seconds.
      Secondary swell..............North at around 4 feet.
      Secondary period.............10 seconds.
Water Temperature
      Ritidian buoy..........85 Degrees.
Winds...............East at 10 to 15 mph.

.WEDNESDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............6 to 8 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............1 to 3 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 4 to 5 feet.
      Primary period...............9 seconds.
      Secondary swell..............North at around 4 feet.
      Secondary period.............10 seconds.
Max Heat Index.........Around 98.
Winds...............East at 10 to 20 mph.

.WEDNESDAY NIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............6 to 8 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............1 to 3 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 4 to 5 feet.
      Primary period...............9 seconds.
      Secondary swell..............North at around 4 feet.
      Secondary period.............10 seconds.
Winds...............East at 10 to 20 mph.

Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  1.4 feet at  5:35 PM Tuesday
High tide  2.0 feet at  9:52 PM Tuesday
Low  tide -0.5 feet at  5:29 AM Wednesday
High tide  2.1 feet at  1:07 PM Wednesday
Low  tide  1.3 feet at  6:46 PM Wednesday
High tide  1.7 feet at 10:56 PM Wednesday

At Rota Island...
Low  tide  1.3 feet at  5:29 PM Tuesday
High tide  1.9 feet at  9:49 PM Tuesday
Low  tide -0.5 feet at  5:23 AM Wednesday
High tide  2.0 feet at  1:04 PM Wednesday
Low  tide  1.2 feet at  6:40 PM Wednesday
High tide  1.6 feet at 10:53 PM Wednesday

At Tinian Island...
Low  tide  0.5 feet at  5:12 PM Tuesday
High tide  1.5 feet at  9:50 PM Tuesday
Low  tide -0.2 feet at  5:06 AM Wednesday
High tide  1.6 feet at  1:05 PM Wednesday
Low  tide  0.4 feet at  6:23 PM Wednesday
High tide  1.3 feet at 10:54 PM Wednesday

At Tanapag Harbor, Saipan...
Low  tide  1.6 feet at  6:03 PM Tuesday
High tide  1.9 feet at  9:52 PM Tuesday
Low  tide -0.2 feet at  5:36 AM Wednesday
High tide  2.3 feet at  1:18 PM Wednesday
Low  tide  1.4 feet at  7:17 PM Wednesday
High tide  1.7 feet at 11:09 PM 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.

$$