843
FZPQ50 PGUM 161800
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
400 AM ChST Sun Aug 17 2025

.DISCUSSION...The trade swell of 2 to 3 ft will slowly build to
between 3 and 4 feet over the next couple of days. This will result
in surf building a bit along east facing reefs, resulting in a
moderate risk of rip currents as early as this evening along east
facing reefs. There will be a moderate risk of lightning through the
middle of the week as weak trade-wind troughs move through the
Marianas, increasing the potential for showers and thunderstorms.

$$

GUZ001-MPZ001>003-170845-
Guam-Rota-Tinian-Saipan-
400 AM ChST Sun Aug 17 2025

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

.TODAY...
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...............8 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Max Heat Index.........Around 100.
Winds...............East at around 10 mph.

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............1 to 3 feet.
      East  facing reefs............3 to 5 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...............8 seconds.
Winds...............East at 10 to 15 mph.

.SUNDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............1 to 3 feet.
      East  facing reefs............3 to 5 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...............8 seconds.
Max Heat Index.........Around 102.
Winds...............East at 10 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  0.1 feet at  8:11 AM Sunday
High tide  2.2 feet at  3:53 PM Sunday
Low  tide  1.8 feet at  8:10 PM Sunday
High tide  2.5 feet at  1:20 AM Monday
Low  tide -0.1 feet at  9:21 AM Monday
High tide  2.3 feet at  5:20 PM Monday

At Rota Island...
Low  tide  0.1 feet at  8:05 AM Sunday
High tide  2.0 feet at  3:50 PM Sunday
Low  tide  1.7 feet at  8:04 PM Sunday
High tide  2.3 feet at  1:17 AM Monday
Low  tide  0.0 feet at  9:15 AM Monday
High tide  2.1 feet at  5:17 PM Monday

At Tinian Island...
Low  tide -0.2 feet at  8:01 AM Sunday
High tide  1.4 feet at  4:01 PM Sunday
Low  tide  1.3 feet at  7:09 PM Sunday
High tide  1.8 feet at 12:37 AM Monday
Low  tide -0.3 feet at  9:05 AM Monday
High tide  1.5 feet at  5:22 PM Monday

At Tanapag Harbor, Saipan...
Low  tide -0.1 feet at  8:23 AM Sunday
High tide  1.8 feet at  4:21 PM Sunday
Low  tide  1.6 feet at  8:01 PM Sunday
High tide  2.2 feet at  1:12 AM Monday
Low  tide -0.3 feet at  9:30 AM Monday
High tide  2.0 feet at  5:42 PM Monday

* 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.

$$