758
FPMY50 PGUM 171748
ZFPGUM

Zone Forecast for Guam and the Northern Marianas
National Weather Service Tiyan GU
348 AM ChST Tue Aug 18 2026

GUZ001-MPZ001-180915-
Guam-Rota-
348 AM ChST Tue Aug 18 2026

.TODAY...Partly sunny with isolated showers in the morning, then
mostly cloudy with scattered showers for Rota, and scattered island-
effect showers for Guam in the afternoon. Isolated thunderstorms in
the afternoon. Light and variable winds. Highs around 86. Chance of
showers 40 percent.
.TONIGHT...Mostly cloudy with scattered showers and isolated
thunderstorms. Light and variable winds becoming north around 10 mph
after midnight. Lows around 76. Chance of showers 40 percent.
.WEDNESDAY AND WEDNESDAY NIGHT...Mostly cloudy with scattered
showers and isolated thunderstorms. Northeast winds 10 to 15 mph.
Highs around 86. Lows around 77. Chance of showers 40 percent.
.THURSDAY...Partly sunny with isolated showers and thunderstorms.
Northeast winds 10 to 15 mph. Highs around 87. Chance of showers 20
percent.
.THURSDAY NIGHT THROUGH FRIDAY NIGHT...Partly cloudy with a 20
percent chance of showers. Lows in the upper 70s. Highs in the upper
80s.
.SATURDAY AND SATURDAY NIGHT...Mostly cloudy. A 30 percent chance of
showers. Highs in the upper 80s. Lows in the upper 70s.
.SUNDAY THROUGH MONDAY...Mostly cloudy. A 40 percent chance of
showers and a slight chance of thunderstorms. Highs in the mid 80s.
Lows in the upper 70s.

$$

MPZ002-003-180915-
Tinian-Saipan-
348 AM ChST Tue Aug 18 2026

.TODAY...Partly sunny. Isolated showers in the morning, then mostly
cloudy with scattered showers and isolated thunderstorms in the
afternoon. Light and variable winds. Highs around 87. Chance of
showers 30 percent.
.TONIGHT...Mostly cloudy with scattered showers and isolated
thunderstorms. Northeast winds 10 to 15 mph. Lows around 77. Chance
of showers 40 percent.
.WEDNESDAY AND WEDNESDAY NIGHT...Mostly cloudy with scattered
showers and isolated thunderstorms. Northeast winds 10 to 15 mph.
Highs around 86. Lows around 77. Chance of showers 40 percent.
.THURSDAY...Partly sunny with isolated showers and thunderstorms.
Northeast winds 10 to 15 mph. Highs around 87. Chance of showers
20 percent.
.THURSDAY NIGHT THROUGH FRIDAY NIGHT...Partly cloudy with a 20
percent chance of showers. Lows in the upper 70s. Highs in the upper
80s.
.SATURDAY AND SATURDAY NIGHT...Mostly cloudy. A 30 percent chance of
showers. Highs in the upper 80s. Lows in the upper 70s.
.SUNDAY THROUGH MONDAY...Mostly cloudy. A 40 percent chance of
showers and a slight chance of thunderstorms. Highs in the mid 80s.
Lows in the upper 70s.

$$