Surf Forecast
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
184
FZPQ50 PGUM 260557
SRFGUM
Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
357 PM ChST Sat Jul 26 2025
.DISCUSSION...The large westerly swell and southwest wind waves are
causing large surf at Guam and dangerous surf for the CNMI, as well
as coastal flooding. A High Surf Warning is in effect for the CNMI
along south and west facing reefs, with a High Surf Advisory along
north facing reefs. A Coastal Flood Warning is also in effect along
south and west facing reefs of the CNMI. A Coastal Flood Advisory is
in effect along south and west facing reefs of Guam, with a High Surf
Advisory along south, west and north facing reefs. A moderate risk
of lightning will continue through the weekend into early next week.
Surf and rip risk will slowly diminish during the first couple days
of next week as TS Krosa and the monsoon surge slowly drift away to
the north.
$$
GUZ001-262100-
Guam-
357 PM ChST Sat Jul 26 2025
...COASTAL FLOOD ADVISORY IN EFFECT UNTIL 6 PM CHST SUNDAY ALONG
SOUTH AND WEST FACING REEFS...
...HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM CHST SUNDAY ALONG NORTH
AND SOUTH FACING REEFS...
...HIGH RIP CURRENT RISK IN EFFECT THROUGH SUNDAY AFTERNOON ALONG
NORTH AND SOUTH FACING REEFS...
...HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM CHST TUESDAY ALONG WEST
FACING REEFS...
...HIGH RIP CURRENT RISK IN EFFECT THROUGH TUESDAY AFTERNOON ALONG
WEST FACING REEFS...
36 hour Surf Zone Forecast for the Marianas from 600 PM Saturday
through 600 AM Monday
.TONIGHT...
Rip Current Risk.....High. Pounding surf will produce life
threatening rip currents at reefs and beaches.
Surf Height
North facing reefs............8 to 10 feet.
East facing reefs............4 to 6 feet.
South facing reefs............9 to 11 feet.
West facing reefs............10 to 13 feet.
Swell/Period
Primary swell................West at 9 to 11 feet.
Primary period...............10 seconds.
Secondary swell..............East at around 2 feet.
Secondary period.............9 seconds.
Water Temperature
Ritidian buoy................85 Degrees.
Winds..............................Breezy. Southwest at 15 to 25 mph.
.SUNDAY...
Rip Current Risk.....High. Pounding surf will produce life
threatening rip currents at reefs and beaches.
Surf Height
North facing reefs............7 to 9 feet.
East facing reefs............4 to 6 feet.
South facing reefs............8 to 10 feet.
West facing reefs............9 to 12 feet.
Swell/Period
Primary swell................West at 8 to 10 feet.
Primary period...............10 seconds.
Secondary swell..............East at around 2 feet.
Secondary period.............9 seconds.
Max Heat Index.....................Around 98.
Winds..............................Southwest at 15 to 20 mph.
.SUNDAY NIGHT...
Rip Current Risk.....High *.
Surf Height
North facing reefs............6 to 8 feet.
East facing reefs............3 to 5 feet.
South facing reefs............6 to 8 feet.
West facing reefs............8 to 11 feet.
Swell/Period
Primary swell................West at 7 to 9 feet.
Primary period...............10 seconds.
Secondary swell..............East at around 2 feet.
Secondary period.............9 seconds.
Winds..............................Southwest at 10 to 15 mph.
Tide information for the next 36 hours...
At Apra Harbor, Guam...
High tide 2.5 feet at 9:59 PM Saturday
Low tide 1.6 feet at 3:28 AM Sunday
High tide 2.6 feet at 8:22 AM Sunday
Low tide 0.0 feet at 3:36 PM Sunday
High tide 2.5 feet at 10:30 PM Sunday
Low tide 1.5 feet at 4:12 AM Monday
High tide 2.4 feet at 9:10 AM Monday
$$
MPZ001>003-262100-
Rota-Tinian-Saipan-
357 PM ChST Sat Jul 26 2025
...COASTAL FLOOD WARNING IN EFFECT UNTIL 6 PM CHST SUNDAY ALONG
SOUTH AND WEST FACING REEFS...
...HIGH SURF WARNING IN EFFECT UNTIL 6 AM CHST SUNDAY ALONG SOUTH
AND WEST FACING REEFS...
...HIGH SURF ADVISORY IN EFFECT UNTIL TO 6 AM CHST MONDAY ALONG
NORTH FACING REEFS...
...HIGH SURF ADVISORY IN EFFECT FROM 6 AM SUNDAY TO 6 AM CHST MONDAY
ALONG SOUTH FACING REEFS...
...HIGH RIP CURRENT RISK IN EFFECT THROUGH SUNDAY NIGHT ALONG NORTH
AND SOUTH FACING REEFS...
...HIGH SURF ADVISORY IN EFFECT FROM 6 AM SUNDAY TO 6 PM CHST
TUESDAY ALONG WEST FACING REEFS...
...HIGH RIP CURRENT RISK IN EFFECT THROUGH TUESDAY AFTERNOON ALONG
WEST FACING REEFS...
36 hour Surf Zone Forecast for the Marianas from 600 PM Saturday
through 600 AM Monday
.TONIGHT...
Rip Current Risk.....High. Pounding surf will produce life
threatening rip currents at reefs and beaches.
Surf Height
North facing reefs............9 to 12 feet.
East facing reefs............5 to 7 feet.
South facing reefs............11 to 15 feet.
West facing reefs............12 to 16 feet.
Swell/Period
Primary swell................West at 10 to 13 feet.
Primary period...............10 seconds.
Secondary swell..............East at around 2 feet.
Secondary period.............9 seconds.
Water Temperature
Ritidian buoy................85 Degrees.
Winds..............................Windy. Southwest at 20 to 30 mph.
Gusts to 40 mph.
.SUNDAY...
Rip Current Risk.....High. Pounding surf will produce life
threatening rip currents at reefs and beaches.
Surf Height
North facing reefs............8 to 10 feet.
East facing reefs............4 to 6 feet.
South facing reefs............9 to 11 feet.
West facing reefs............10 to 13 feet.
Swell/Period
Primary swell................West at 8 to 11 feet.
Primary period...............10 seconds.
Secondary swell..............East at around 2 feet.
Secondary period.............9 seconds.
Max Heat Index.....................Around 96.
Winds..............................Breezy. Southwest at 20 to 25 mph.
.SUNDAY NIGHT...
Rip Current Risk.....High. Pounding surf will produce life
threatening rip currents at reefs and beaches.
Surf Height
North facing reefs............8 to 10 feet.
East facing reefs............3 to 5 feet.
South facing reefs............7 to 9 feet.
West facing reefs............10 to 12 feet.
Swell/Period
Primary swell................West at 7 to 10 feet.
Primary period...............10 seconds.
Secondary swell..............East at around 2 feet.
Secondary period.............9 seconds.
Winds..............................Breezy. Southwest at 15 to 25 mph.
Tide information for the next 36 hours...
At Rota Island...
High tide 2.4 feet at 9:56 PM Saturday
Low tide 1.5 feet at 3:22 AM Sunday
High tide 2.4 feet at 8:19 AM Sunday
Low tide 0.0 feet at 3:30 PM Sunday
High tide 2.4 feet at 10:27 PM Sunday
Low tide 1.4 feet at 4:06 AM Monday
High tide 2.3 feet at 9:07 AM Monday
At Tinian Island...
High tide 1.7 feet at 9:50 PM Saturday
Low tide 1.3 feet at 2:49 AM Sunday
High tide 1.8 feet at 7:27 AM Sunday
Low tide -0.1 feet at 3:08 PM Sunday
High tide 1.7 feet at 10:17 PM Sunday
Low tide 1.1 feet at 3:44 AM Monday
High tide 1.6 feet at 8:21 AM Monday
At Tanapag Harbor, Saipan...
Low tide -0.4 feet at 3:05 PM Saturday
High tide 2.3 feet at 10:23 PM Saturday
Low tide 1.4 feet at 3:47 AM Sunday
High tide 2.1 feet at 8:30 AM Sunday
Low tide -0.2 feet at 3:44 PM Sunday
High tide 2.2 feet at 10:57 PM Sunday
Low tide 1.3 feet at 4:33 AM 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.
$$