738
FZPQ50 PGUM 170614
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
414 PM ChST Thu Jul 17 2025

.DISCUSSION...There is a moderate risk of rip currents along east
facing reefs of the Marianas through at least the weekend. A
moderate risk if lightning is expected through at least Saturday.
A west-southwest swell has been slower to develop and may arrive
later this weekend. This swell may increase the surf enough to
produce a moderate risk of rip currents along south and west
facing reefs.

$$

GUZ001-MPZ001>003-172100-
Guam-Rota-Tinian-Saipan-
414 PM ChST Thu Jul 17 2025

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

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............2 to 4 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 3 to 5 feet.
      Primary period...............8 seconds.
      Secondary swell..............West at around 2 feet.
      Secondary period.............7 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Winds...............East at 10 to 15 mph.

.FRIDAY...
Rip Current Risk.....Moderate *.
Surf Height
  North facing reefs............2 to 4 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 3 to 5 feet.
      Primary period...............8 seconds.
      Secondary swell..............West at around 2 feet.
      Secondary period.............7 seconds.
Max Heat Index.........Around 99.
Winds...............East at 10 to 15 mph.

.FRIDAY NIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............3 to 5 feet.
      East  facing reefs............4 to 6 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 2 to 4 feet.
      Primary period...............8 seconds.
      Secondary swell..............West at around 2 feet.
      Secondary period.............7 seconds.
Winds...............East at 10 to 20 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  0.9 feet at  6:14 PM Thursday
High tide  2.7 feet at 12:44 AM Friday
Low  tide  0.8 feet at  7:40 AM Friday
High tide  2.1 feet at  1:41 PM Friday
Low  tide  1.3 feet at  7:06 PM Friday
High tide  2.7 feet at  1:20 AM Saturday

At Rota Island...
Low  tide  0.8 feet at  6:08 PM Thursday
High tide  2.5 feet at 12:41 AM Friday
Low  tide  0.7 feet at  7:34 AM Friday
High tide  1.9 feet at  1:38 PM Friday
Low  tide  1.2 feet at  7:00 PM Friday
High tide  2.5 feet at  1:17 AM Saturday

At Tinian Island...
Low  tide  0.5 feet at  5:34 PM Thursday
High tide  1.8 feet at 12:14 AM Friday
Low  tide  0.4 feet at  7:31 AM Friday
High tide  1.2 feet at  1:31 PM Friday
Low  tide  0.8 feet at  6:18 PM Friday
High tide  1.9 feet at 12:44 AM Saturday

At Tanapag Harbor, Saipan...
Low  tide  0.6 feet at  6:17 PM Thursday
High tide  2.3 feet at 12:55 AM Friday
Low  tide  0.5 feet at  7:57 AM Friday
High tide  1.6 feet at  1:54 PM Friday
Low  tide  0.9 feet at  7:05 PM Friday
High tide  2.3 feet at  1:21 AM Saturday

* 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.

$$