Surf Forecast
Issued by NWS Tiyan, Guam

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Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
450 AM ChST Mon Oct 13 2025

.DISCUSSION...There will be a moderate risk of rip currents along
north and east facing reefs of the Marianas through at least Friday.
Surf will remain near current levels through Tuesday, then build a
little Tuesday night. There will also be a moderate risk of lightning
starting tonight.

$$

GUZ001-MPZ001>003-131000-
Guam-Rota-Tinian-Saipan-
450 AM ChST Mon Oct 13 2025

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

.TODAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 6 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................North at 3 to 4 feet.
      Primary period...............11 seconds.
      Secondary swell..............East at around 4 feet.
      Secondary period.............8 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Max Heat Index.........Around 102.
Winds...............East at 10 to 15 mph.

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 6 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................North at 3 to 4 feet.
      Primary period...............11 seconds.
      Secondary swell..............East at around 4 feet.
      Secondary period.............8 seconds.
Winds...............East at 10 to 15 mph.

.TUESDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 6 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..............North at around 4 feet.
      Secondary period.............11 seconds.
Max Heat Index.........Around 102.
Winds...............East at 10 to 20 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide -0.4 feet at  6:14 AM Monday
High tide  2.2 feet at  2:22 PM Monday
Low  tide  1.7 feet at  7:22 PM Monday
High tide  2.0 feet at 11:19 PM Monday
Low  tide -0.2 feet at  7:25 AM Tuesday
High tide  2.2 feet at  3:36 PM Tuesday
Low  tide  1.6 feet at  8:57 PM Tuesday

At Rota Island...
Low  tide -0.4 feet at  6:08 AM Monday
High tide  2.1 feet at  2:19 PM Monday
Low  tide  1.6 feet at  7:16 PM Monday
High tide  1.9 feet at 11:16 PM Monday
Low  tide -0.2 feet at  7:19 AM Tuesday
High tide  2.1 feet at  3:33 PM Tuesday
Low  tide  1.5 feet at  8:51 PM Tuesday

At Tinian Island...
Low  tide -0.5 feet at  6:01 AM Monday
High tide  1.6 feet at  2:21 PM Monday
Low  tide  1.3 feet at  6:36 PM Monday
High tide  1.6 feet at 10:36 PM Monday
Low  tide -0.4 feet at  7:08 AM Tuesday
High tide  1.6 feet at  3:19 PM Tuesday
Low  tide  1.3 feet at  8:03 PM Tuesday

At Tanapag Harbor, Saipan...
Low  tide -0.3 feet at  6:24 AM Monday
High tide  2.2 feet at  2:34 PM Monday
Low  tide  1.7 feet at  7:46 PM Monday
High tide  1.9 feet at 11:17 PM Monday
Low  tide -0.2 feet at  7:34 AM Tuesday
High tide  2.2 feet at  3:48 PM Tuesday
Low  tide  1.6 feet at  9:20 PM Tuesday

* 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.

$$