745
FPMY50 PGUM 201703
ZFPGUM
ZONE FORECAST FOR GUAM AND THE NORTHERN MARIANAS
NATIONAL WEATHER SERVICE TIYAN GU
303 AM CHST FRI AUG 21 2026
GUZ001-MPZ001-210800-
GUAM-ROTA-
303 AM CHST FRI AUG 21 2026
TODAY
PARTLY CLOUDY WITH ISOLATED LIGHT SHOWERS IN THE MORNING,
THEN SCATTERED, LOCALLY HEAVY ISLAND EFFECT SHOWERS AND ISOLATED
THUNDERSTORMS BEGINNING NEAR NOON FOR GUAM. LIGHT AND VARIABLE WINDS.
HIGHS AROUND 86. CHANCE OF SHOWERS 50 PERCENT.
TONIGHT
PARTLY CLOUDY WITH ISOLATED SHOWERS AND THUNDERSTORMS.
LIGHT AND VARIABLE WINDS BECOMING SOUTHWEST AROUND 10 MPH AFTER
MIDNIGHT. LOWS AROUND 77. CHANCE OF SHOWERS 20 PERCENT.
SATURDAY
BREEZY. MOSTLY CLOUDY WITH SCATTERED SHOWERS AND
ISOLATED THUNDERSTORMS. SOUTHWEST WINDS 15 TO 25 MPH. HIGHS AROUND
87. CHANCE OF SHOWERS 30 PERCENT.
SATURDAY NIGHT THROUGH SUNDAY
CLOUDY AND WINDY. NUMEROUS HEAVY
SHOWERS AND ISOLATED THUNDERSTORMS. SOUTHWEST WINDS 20 TO 30 MPH WITH
GUSTS UP TO 40 MPH POSSIBLE NEAR HEAVIER SHOWERS. LOWS AROUND 77.
HIGHS NEAR 86. CHANCE OF SHOWERS 60 PERCENT.
SUNDAY NIGHT THROUGH WEDNESDAY
BREEZY. CLOUDY WITH A 50 PERCENT
CHANCE OF SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS. LOCALLY HEAVY
SHOWERS POSSIBLE. LOWS IN THE UPPER 70S. HIGHS IN THE MID 80S.
WEDNESDAY NIGHT AND THURSDAY
MOSTLY CLOUDY WITH A 40 PERCENT CHANCE
OF SHOWERS. LOWS IN THE UPPER 70S. HIGHS IN THE UPPER 80S.
MPZ002-003-210800-
TINIAN-SAIPAN-
303 AM CHST FRI AUG 21 2026
..TROPICAL STORM WATCH REMAINS IN EFFECT
TODAY
PARTLY CLOUDY WITH ISOLATED SHOWERS IN THE MORNING, THEN
SCATTERED ISLAND EFFECT SHOWERS AND ISOLATED THUNDERSTORMS IN THE
AFTERNOON. LOCALLY HEAVY SHOWERS POSSIBLE. LIGHT AND VARIABLE WINDS
BECOMING NORTHWEST AROUND 10 MPH IN THE AFTERNOON. HIGHS AROUND 87.
CHANCE OF SHOWERS 40 PERCENT.
TONIGHT
TROPICAL STORM CONDITIONS POSSIBLE. MOSTLY CLOUDY WITH
SCATTERED SHOWERS, BECOMING NUMEROUS AND HEAVY AFTER MIDNIGHT.
ISOLATED THUNDERSTORMS. LOCALLY HEAVY SHOWERS POSSIBLE. WEST WINDS 10
TO 15 MPH, INCREASING TO 25 TO 40 MPH AFTER MIDNIGHT. LOWS AROUND
75. CHANCE OF SHOWERS 60 PERCENT.
SATURDAY THROUGH SUNDAY
TROPICAL STORM CONDITIONS POSSIBLE.
CLOUDY. PERIODS OF RAIN, WIDESPREAD HEAVY SHOWERS AND SCATTERED
THUNDERSTORMS. SOUTHWEST WINDS 30 TO 40 MPH WITH GUSTS TO 50 MPH.
HIGHS NEAR 84. LOWS AROUND 76. CHANCE OF SHOWERS 90 PERCENT.
SUNDAY NIGHT THROUGH WEDNESDAY
CLOUDY WITH A 50 PERCENT CHANCE OF
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS. LOWS IN THE MID 70S.
HIGHS IN THE MID 80S.
WEDNESDAY NIGHT THROUGH THURSDAY
MOSTLY CLOUDY WITH A 40 PERCENT
CHANCE OF SHOWERS. LOWS IN THE UPPER 70S. HIGHS IN THE UPPER 80S.
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