836
FZPQ50 PGUM 191819
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
419 AM ChST Sun Jul 20 2025

.DISCUSSION...There is a moderate risk of rip currents along east
facing reefs and a moderate risk of lightning through at least
Monday. A west-southwest monsoon swell is expected to slowly build
across the region over the next several days, potentially increasing
surf enough to produce a moderate risk of rip currents along south
and west facing reefs around the middle of the week.

$$

GUZ001-MPZ001>003-201000-
Guam-Rota-Tinian-Saipan-
419 AM ChST Sun Jul 20 2025

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

.TODAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............2 to 4 feet.
      East  facing reefs............4 to 6 feet.
      South facing reefs............2 to 3 feet.
      West  facing reefs............1 to 3 feet.
Swell/Period
      Primary swell................East at 3 to 4 feet.
      Primary period...............8 seconds.
      Secondary swell..............West at 1 to 2 feet.
      Secondary period.............8 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Max Heat Index.........Around 102.
Winds...............East at 5 to 15 mph.

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............2 to 4 feet.
      East  facing reefs............4 to 6 feet.
      South facing reefs............2 to 3 feet.
      West  facing reefs............1 to 3 feet.
Swell/Period
      Primary swell................East at 3 to 4 feet.
      Primary period...............8 seconds.
      Secondary swell..............West at 1 to 2 feet.
      Secondary period.............8 seconds.
Winds...............Light and variable becoming southeast
around 10 mph after midnight.

.MONDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............2 to 4 feet.
      East  facing reefs............4 to 6 feet.
      South facing reefs............2 to 3 feet.
      West  facing reefs............1 to 3 feet.
Swell/Period
      Primary swell................East at 3 to 4 feet.
      Primary period...............8 seconds.
      Secondary swell..............Southwest at 1 to 2 feet.
      Secondary period.............9 seconds.
Max Heat Index.........Around 102.
Winds...............Southeast at 10 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  0.1 feet at  9:41 AM Sunday
High tide  2.2 feet at  5:09 PM Sunday
Low  tide  1.8 feet at  9:24 PM Sunday
High tide  2.7 feet at  2:51 AM Monday
Low  tide -0.1 feet at 10:40 AM Monday
High tide  2.4 feet at  6:23 PM Monday
Low  tide  2.0 feet at 10:45 PM Monday

At Rota Island...
Low  tide  0.1 feet at  9:35 AM Sunday
High tide  2.1 feet at  5:06 PM Sunday
Low  tide  1.7 feet at  9:18 PM Sunday
High tide  2.5 feet at  2:48 AM Monday
Low  tide -0.1 feet at 10:34 AM Monday
High tide  2.2 feet at  6:20 PM Monday
Low  tide  1.8 feet at 10:39 PM Monday

At Tinian Island...
Low  tide -0.2 feet at  9:26 AM Sunday
High tide  1.4 feet at  5:14 PM Sunday
Low  tide  1.3 feet at  8:20 PM Sunday
High tide  2.0 feet at  2:02 AM Monday
Low  tide -0.4 feet at 10:21 AM Monday
High tide  1.5 feet at  6:26 PM Monday
Low  tide  1.4 feet at  9:34 PM Monday

At Tanapag Harbor, Saipan...
Low  tide -0.2 feet at  9:51 AM Sunday
High tide  1.8 feet at  5:35 PM Sunday
Low  tide  1.6 feet at  9:11 PM Sunday
High tide  2.3 feet at  2:35 AM Monday
Low  tide -0.4 feet at 10:45 AM Monday
High tide  2.0 feet at  6:47 PM Monday
Low  tide  1.8 feet at 10:26 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.

$$