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FZPQ50 PGUM 041853 AAA
SRFGUM

Surf Zone Forecast for the Mariana Islands...UPDATED
National Weather Service Tiyan GU
453 AM ChST Fri Dec 5 2025

Updated for moderate risk of lightning for Guam today.

.DISCUSSION...
There is a moderate risk of rip currents along north and east facing
reefs and a low risk along south and west reefs. The surf is expected
rise a foot or so as another pulse of northerly swell moves through
the region this weekend. Surf is expected to remain just below 9 feet
at this time. There is a moderate risk of lightning for Guam today.

$$

GUZ001-MPZ001>003-051000-
Guam-Rota-Tinian-Saipan-
453 AM ChST Fri Dec 5 2025

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

.TODAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 6 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..............Northeast at around 3 feet.
      Secondary period.............12 seconds.
Water Temperature
      Ritidian buoy..........85 Degrees.
Max Heat Index.........Around 101.
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............1 to 3 feet.
Swell/Period
      Primary swell................East at 3 to 4 feet.
      Primary period...............9 seconds.
      Secondary swell..............Northeast at 2 to 3 feet.
      Secondary period.............11 seconds.
Winds...............East at 10 to 15 mph.

.SATURDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............5 to 7 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................Northeast at 4 to 6 feet.
      Primary period...............10 seconds.
      Secondary swell..............North at 2 to 3 feet.
      Secondary period.............10 seconds.
Max Heat Index.........Around 100.
Winds...............East at 10 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  2.4 feet at  8:36 AM Friday
Low  tide  1.5 feet at  1:40 PM Friday
High tide  2.5 feet at  6:37 PM Friday
Low  tide -1.2 feet at  2:06 AM Saturday
High tide  2.4 feet at  9:30 AM Saturday
Low  tide  1.5 feet at  2:36 PM Saturday
High tide  2.4 feet at  7:22 PM Saturday

At Rota Island...
High tide  2.2 feet at  8:33 AM Friday
Low  tide  1.4 feet at  1:34 PM Friday
High tide  2.3 feet at  6:34 PM Friday
Low  tide -1.1 feet at  2:00 AM Saturday
High tide  2.2 feet at  9:27 AM Saturday
Low  tide  1.4 feet at  2:30 PM Saturday
High tide  2.3 feet at  7:19 PM Saturday

At Tinian Island...
High tide  1.7 feet at  8:41 AM Friday
Low  tide  1.4 feet at 12:27 PM Friday
High tide  2.0 feet at  5:37 PM Friday
Low  tide -0.8 feet at  1:46 AM Saturday
High tide  1.7 feet at  9:44 AM Saturday
Low  tide  1.5 feet at  1:34 PM Saturday
High tide  2.0 feet at  6:23 PM Saturday

At Tanapag Harbor, Saipan...
High tide  2.4 feet at  8:57 AM Friday
Low  tide  1.7 feet at  1:46 PM Friday
High tide  2.4 feet at  6:26 PM Friday
Low  tide -0.9 feet at  2:10 AM Saturday
High tide  2.5 feet at  9:51 AM Saturday
Low  tide  1.8 feet at  2:47 PM Saturday
High tide  2.4 feet at  7:12 PM 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.

$$

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