286
FZPQ50 PGUM 130619
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
419 PM ChST Wed Aug 13 2025

.DISCUSSION...The primary trade swell remains around 2 to 3 ft as the
trade winds remain light. With no other notable swells, the risk of
rip currents remains low along all reefs. There will be a moderate
risk of lightning through at least Thursday, especially for Guam where
island convection may cause thunderstorms to develop near western
shores and nearby waters.

$$

GUZ001-MPZ001>003-132200-
Guam-Rota-Tinian-Saipan-
419 PM ChST Wed Aug 13 2025

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

.TONIGHT...
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............Around 1 foot.
Swell/Period
      Primary swell................East at 2 to 3 feet.
      Primary period...............9 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Winds...............Light and variable.

.THURSDAY...
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............Around 1 foot.
Swell/Period
      Primary swell................East at 2 to 3 feet.
      Primary period...............9 seconds.
Max Heat Index.........Around 101.
Winds...............Light and variable.

.THURSDAY 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............Around 1 foot.
Swell/Period
      Primary swell................East at 2 to 3 feet.
      Primary period...............9 seconds.
Winds...............Light and variable.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  2.6 feet at 10:40 PM Wednesday
Low  tide  0.8 feet at  5:11 AM Thursday
High tide  2.3 feet at 11:02 AM Thursday
Low  tide  0.9 feet at  5:05 PM Thursday
High tide  2.6 feet at 11:11 PM Thursday
Low  tide  0.5 feet at  6:05 AM Friday

At Rota Island...
High tide  2.5 feet at 10:37 PM Wednesday
Low  tide  0.7 feet at  5:05 AM Thursday
High tide  2.2 feet at 10:59 AM Thursday
Low  tide  0.9 feet at  4:59 PM Thursday
High tide  2.5 feet at 11:08 PM Thursday
Low  tide  0.5 feet at  5:59 AM Friday

At Tinian Island...
High tide  1.7 feet at 10:11 PM Wednesday
Low  tide  0.5 feet at  4:54 AM Thursday
High tide  1.3 feet at 10:40 AM Thursday
Low  tide  0.6 feet at  4:27 PM Thursday
High tide  1.7 feet at 10:38 PM Thursday
Low  tide  0.2 feet at  5:53 AM Friday

At Tanapag Harbor, Saipan...
High tide  2.2 feet at 11:01 PM Wednesday
Low  tide  0.6 feet at  5:25 AM Thursday
High tide  1.8 feet at 11:22 AM Thursday
Low  tide  0.7 feet at  5:11 PM Thursday
High tide  2.2 feet at 11:27 PM Thursday
Low  tide  0.3 feet at  6:20 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.

$$