048
FPMY50 PGUM 210555
ZFPGUM

Zone Forecast for Guam and the Northern Marianas
National Weather Service Tiyan GU
355 PM ChST Thu Aug 21 2025

GUZ001-MPZ001-212100-
Guam-Rota-
355 PM ChST Thu Aug 21 2025

.TONIGHT...Cloudy becoming mostly cloudy around midnight. Scattered
showers and isolated thunderstorms. Locally heavy showers possible.
East winds 10 to 15 mph. Lows around 76. Chance of showers 50
percent.
.FRIDAY...Mostly cloudy with scattered showers and isolated
thunderstorms. East winds 10 to 15 mph. Highs around 87. Chance of
showers 50 percent, becoming 30 percent in the afternoon.
.FRIDAY NIGHT...Mostly cloudy with isolated showers and
thunderstorms. East winds 5 to 10 mph. Lows around 78. Chance of
showers 20 percent.
.SATURDAY...Partly sunny with scattered showers and isolated
thunderstorms. East winds 5 to 10 mph. Highs around 87. Chance of
showers 30 percent.
.SATURDAY NIGHT AND SUNDAY...Partly cloudy with isolated showers and
thunderstorms. East winds 10 to 15 mph. Lows around 78. Highs around
86. Chance of showers 20 percent.
.SUNDAY NIGHT...Mostly cloudy with a 20 percent chance of showers
and thunderstorms. Lows in the upper 70s.
.MONDAY THROUGH WEDNESDAY NIGHT...Mostly cloudy with a 40 percent
chance of showers and a slight chance of thunderstorms. Highs in the
upper 80s. Lows in the upper 70s.
.THURSDAY...Partly sunny with a 30 percent chance of showers. Highs
in the upper 80s.

$$

MPZ002-003-212100-
Tinian-Saipan-
355 PM ChST Thu Aug 21 2025

.TONIGHT...Mostly cloudy with scattered showers and isolated
thunderstorms. East winds 10 to 15 mph. Lows around 77. Chance of
showers 40 percent.
.FRIDAY...Partly sunny with scattered showers and isolated
thunderstorms. East winds 10 to 15 mph. Highs around 87. Chance of
showers 50 percent, becoming 30 percent in the afternoon.
.FRIDAY NIGHT...Mostly cloudy with isolated showers and
thunderstorms. East winds 10 to 15 mph. Lows around 78. Chance of
showers 20 percent.
.SATURDAY...Partly sunny with scattered showers and isolated
thunderstorms. East winds 10 to 15 mph. Highs around 87. Chance of
showers 30 percent.
.SATURDAY NIGHT AND SUNDAY...Partly cloudy with isolated showers and
thunderstorms. East winds 10 to 15 mph. Lows around 78. Highs around
86. Chance of showers 20 percent.
.SUNDAY NIGHT AND MONDAY...Partly cloudy with a 20 percent chance of
showers and thunderstorms. Lows in the upper 70s. Highs in the upper
80s.
.MONDAY NIGHT AND TUESDAY...Mostly cloudy with a 30 percent chance
of showers and a slight chance of thunderstorms. Lows in the upper
70s. Highs in the upper 80s.
.TUESDAY NIGHT THROUGH WEDNESDAY NIGHT...Mostly cloudy with a 40
percent chance of showers and a slight chance of thunderstorms. Lows
in the upper 70s. Highs in the upper 80s.
.THURSDAY...Partly sunny with a 30 percent chance of showers. Highs
in the upper 80s.

$$