318
FZPQ50 PGUM 100637
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
437 PM ChST Fri Oct 10 2025

.DISCUSSION...There will be a moderate risk of rip currents along
east facing reefs, with a low risk along all other reefs. A long-
period north swell emanating from distant Typhoon Halong will
increase surf along north facing reefs, and increase the risk of rip
currents to moderate by Saturday. There will also be a moderate risk
of lightning through Saturday.

$$

GUZ001-MPZ001>003-102145-
Guam-Rota-Tinian-Saipan-
437 PM ChST Fri Oct 10 2025

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

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

.SATURDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 6 feet.
      East  facing reefs............4 to 6 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............1 to 3 feet.
Swell/Period
      Primary swell................Northeast at 3 to 5 feet.
      Primary period...............9 seconds.
      Secondary swell..............East at around 3 feet.
      Secondary period.............8 seconds.
Max Heat Index.........Around 102.
Winds...............East at around 10 mph.

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


Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  2.5 feet at  8:55 PM Friday
Low  tide -0.5 feet at  4:14 AM Saturday
High tide  2.3 feet at 11:30 AM Saturday
Low  tide  1.6 feet at  4:44 PM Saturday
High tide  2.4 feet at  9:33 PM Saturday
Low  tide -0.5 feet at  5:10 AM Sunday

At Rota Island...
High tide  2.3 feet at  8:52 PM Friday
Low  tide -0.5 feet at  4:08 AM Saturday
High tide  2.2 feet at 11:27 AM Saturday
Low  tide  1.5 feet at  4:38 PM Saturday
High tide  2.2 feet at  9:30 PM Saturday
Low  tide -0.5 feet at  5:04 AM Sunday

At Tinian Island...
High tide  1.8 feet at  8:09 PM Friday
Low  tide -0.5 feet at  4:00 AM Saturday
High tide  1.6 feet at 11:44 AM Saturday
Low  tide  1.3 feet at  4:06 PM Saturday
High tide  1.8 feet at  8:48 PM Saturday
Low  tide -0.5 feet at  4:58 AM Sunday

At Tanapag Harbor, Saipan...
High tide  2.2 feet at  8:55 PM Friday
Low  tide -0.5 feet at  4:20 AM Saturday
High tide  2.3 feet at 12:02 PM Saturday
Low  tide  1.6 feet at  4:56 PM Saturday
High tide  2.1 feet at  9:29 PM Saturday
Low  tide -0.4 feet at  5:18 AM Sunday

* 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.

$$