858
FZPQ50 PGUM 180753
SRFGUM
SURF ZONE FORECAST FOR THE MARIANA ISLANDS
NATIONAL WEATHER SERVICE TIYAN GU
553 PM CHST TUE AUG 18 2026
DISCUSSION
THERE IS A MODERATE RISK OF RIP CURRENTS ALONG NORTH- AND WEST-FACING
REEFS AND A MODERATE RISK OF LIGHTNING FOR THE NEXT FEW DAYS.
DEPENDING ON THE TRACK OF INVEST 92W, A LONG-PERIOD, EASTERLY SWELL
MAY APPROACH THE REGION LATER THIS WEEK. THIS SITUATION WILL CONTINUE
TO BE MONITORED CLOSELY.
GUZ001-MPZ001>003-182300-
GUAM-ROTA-TINIAN-SAIPAN-
553 PM CHST TUE AUG 18 2026
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 PM TUESDAY
THROUGH 600 AM THURSDAY
TONIGHT
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............3 TO 5 FEET.
EAST FACING REEFS............2 TO 3 FEET.
SOUTH FACING REEFS............1 TO 3 FEET.
WEST FACING REEFS............4 TO 6 FEET.
SWELL/PERIOD
PRIMARY SWELL................WEST AT 3 TO 4 FEET.
PRIMARY PERIOD...............8 SECONDS.
SECONDARY SWELL..............NORTH AT AROUND 2 FEET.
SECONDARY PERIOD.............8 SECONDS.
WATER TEMPERATURE
PAGO BAY BUOY..........84 DEGREES.
WINDS...............LIGHT AND VARIABLE BECOMING NORTH AT AROUND
10 MPH AFTER MIDNIGHT.
WEDNESDAY
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............3 TO 5 FEET.
EAST FACING REEFS............2 TO 3 FEET.
SOUTH FACING REEFS............1 TO 3 FEET.
WEST FACING REEFS............4 TO 6 FEET.
SWELL/PERIOD
PRIMARY SWELL................WEST AT 2 TO 3 FEET.
PRIMARY PERIOD...............9 SECONDS.
SECONDARY SWELL..............NORTH AT AROUND 2 FEET.
SECONDARY PERIOD.............8 SECONDS.
MAX HEAT INDEX.........AROUND 100.
WINDS...............NORTH AT 10 TO 15 MPH.
WEDNESDAY NIGHT
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............3 TO 5 FEET.
EAST FACING REEFS............2 TO 3 FEET.
SOUTH FACING REEFS............1 TO 3 FEET.
WEST FACING REEFS............4 TO 6 FEET.
SWELL/PERIOD
PRIMARY SWELL................WEST AT 2 TO 3 FEET.
PRIMARY PERIOD...............9 SECONDS.
SECONDARY SWELL..............NORTHEAST AT AROUND 3 FEET.
SECONDARY PERIOD.............8 SECONDS.
WINDS...............NORTHEAST AT 10 TO 15 MPH.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT APRA HARBOR, GUAM...
HIGH TIDE 2.3 FEET AT 11:18 PM TUESDAY
LOW TIDE 0.6 FEET AT 6:29 AM WEDNESDAY
HIGH TIDE 2.0 FEET AT 1:14 PM WEDNESDAY
LOW TIDE 1.5 FEET AT 6:14 PM WEDNESDAY
HIGH TIDE 2.2 FEET AT 11:48 PM WEDNESDAY
LOW TIDE 0.5 FEET AT 7:21 AM THURSDAY
AT ROTA ISLAND...
HIGH TIDE 2.2 FEET AT 11:15 PM TUESDAY
LOW TIDE 0.5 FEET AT 6:23 AM WEDNESDAY
HIGH TIDE 1.8 FEET AT 1:11 PM WEDNESDAY
LOW TIDE 1.4 FEET AT 6:08 PM WEDNESDAY
HIGH TIDE 2.1 FEET AT 11:45 PM WEDNESDAY
LOW TIDE 0.4 FEET AT 7:15 AM THURSDAY
AT TINIAN ISLAND...
HIGH TIDE 1.7 FEET AT 11:16 PM TUESDAY
LOW TIDE 0.2 FEET AT 6:06 AM WEDNESDAY
HIGH TIDE 1.5 FEET AT 1:12 PM WEDNESDAY
LOW TIDE 0.5 FEET AT 5:51 PM WEDNESDAY
HIGH TIDE 1.7 FEET AT 11:46 PM WEDNESDAY
LOW TIDE 0.2 FEET AT 6:58 AM THURSDAY
AT TANAPAG HARBOR, SAIPAN...
HIGH TIDE 2.0 FEET AT 11:42 PM TUESDAY
LOW TIDE 0.4 FEET AT 6:50 AM WEDNESDAY
HIGH TIDE 1.6 FEET AT 1:32 PM WEDNESDAY
LOW TIDE 1.3 FEET AT 6:12 PM WEDNESDAY
HIGH TIDE 2.0 FEET AT 12:06 AM THURSDAY
LOW TIDE 0.3 FEET AT 7:43 AM THURSDAY
* 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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