010
FZPQ50 PGUM 010538
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
338 PM ChST Fri Aug 1 2025

.DISCUSSION...A moderate risk of rip currents will continue along
west and north facing reefs as the elevated west-northwest swell
persists. A strengthening secondary trade swell will likely allow a
moderate rip current risk to develop along east facing reefs by
Saturday night. A moderate risk of lightning is expected to continue
through the weekend.

$$

GUZ001-MPZ001>003-012045-
Guam-Rota-Tinian-Saipan-
338 PM ChST Fri Aug 1 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............3 to 5 feet.
      East  facing reefs............2 to 4 feet.
      South facing reefs............1 to 3 feet.
      West  facing reefs............4 to 6 feet.
Swell/Period
      Primary swell................West at around 4 feet.
      Primary period...............10 seconds.
      Secondary swell..............East at around 2 feet.
      Secondary period.............8 seconds.
Water Temperature
      Ritidian buoy................84 Degrees.
Winds......................North to northeast winds 5 to 10 mph.

.SATURDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............3 to 5 feet.
      East  facing reefs............2 to 4 feet.
      South facing reefs............1 to 3 feet.
      West  facing reefs............4 to 6 feet.
Swell/Period
      Primary swell................West at around 4 feet.
      Primary period...............10 seconds.
      Secondary swell..............East at around 2 feet.
      Secondary period.............8 seconds.
Max Heat Index.....................Around 101.
Winds......................Northeast to east winds 5 to 15 mph.

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


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  1.4 feet at  6:37 PM Friday
High tide  2.3 feet at 12:39 AM Saturday
Low  tide  0.7 feet at  8:06 AM Saturday
High tide  1.9 feet at  3:21 PM Saturday
Low  tide  1.6 feet at  7:32 PM Saturday
High tide  2.2 feet at  1:13 AM Sunday

At Rota Island...
Low  tide  1.3 feet at  6:31 PM Friday
High tide  2.2 feet at 12:36 AM Saturday
Low  tide  0.6 feet at  8:00 AM Saturday
High tide  1.8 feet at  3:18 PM Saturday
Low  tide  1.5 feet at  7:26 PM Saturday
High tide  2.1 feet at  1:10 AM Sunday

At Tinian Island...
Low  tide  1.0 feet at  5:42 PM Friday
High tide  1.6 feet at 12:03 AM Saturday
Low  tide  0.3 feet at  8:07 AM Saturday
High tide  1.2 feet at  3:46 PM Saturday
Low  tide  1.2 feet at  6:23 PM Saturday
High tide  1.6 feet at 12:29 AM Sunday

At Tanapag Harbor, Saipan...
Low  tide  1.1 feet at  6:21 PM Friday
High tide  2.0 feet at 12:51 AM Saturday
Low  tide  0.5 feet at  8:29 AM Saturday
High tide  1.4 feet at  3:53 PM Saturday
Low  tide  1.4 feet at  6:53 PM Saturday
High tide  2.0 feet at  1:11 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.

$$