242
FPMY50 PGUM 161918
ZFPGUM

Zone Forecast for Guam and the Northern Marianas
National Weather Service Tiyan GU
518 AM ChST Mon Aug 17 2026

GUZ001-170815-
Guam-
518 AM ChST Mon Aug 17 2026

.TODAY...Partly sunny with scattered showers and isolated
thunderstorms. West winds 5 to 10 mph. Highs around 86. Chance of
showers 40 percent.
.TONIGHT...Mostly cloudy with scattered showers and isolated
thunderstorms. Light and variable winds. Lows around 77. Chance of
showers 30 percent.
.TUESDAY...Partly sunny with isolated showers and thunderstorms.
Then partly cloudy with scattered island effect showers and isolated
thunderstorms in the afternoon. Light and variable winds becoming
north at 5 to 10 mph in the afternoon. Highs around 87. Chance of
showers 30 percent.
.TUESDAY NIGHT AND WEDNESDAY...Mostly cloudy. Scattered showers and
isolated thunderstorms. North winds 10 to 15 mph. Lows around 76.
Highs around 86. Chance of showers 40 percent.
.WEDNESDAY NIGHT...Mostly cloudy with a 30 percent chance of showers
and a slight chance of thunderstorms. Lows in the mid 70s.
.THURSDAY AND THURSDAY NIGHT...Mostly cloudy. A 20 percent chance of
showers. Highs in the mid 80s. Lows in the mid 70s.
.FRIDAY...Partly cloudy with a 20 percent chance of showers. Highs
in the upper 80s.
.FRIDAY NIGHT...Mostly cloudy with a 20 percent chance of showers
and thunderstorms. Lows in the upper 70s.
.SATURDAY...Partly sunny with a 30 percent chance of showers and a
slight chance of thunderstorms. Highs in the mid 80s.
.SATURDAY NIGHT...Mostly cloudy with a 20 percent chance of showers
and thunderstorms. Lows in the mid 70s.
.SUNDAY...Partly sunny with a 30 percent chance of showers and a
slight chance of thunderstorms. Highs in the mid 80s.


$$

MPZ002-003-170815-
Tinian-Saipan-
518 AM ChST Mon Aug 17 2026

.TODAY...Partly sunny with isolated showers and thunderstorms. Then
scattered island effect showers for Saipan in the afternoon. Southwest
winds 5 to 10 mph. Highs around 87. Chance of showers 30 percent.
.TONIGHT...Partly cloudy with isolated showers and thunderstorms.
Light and variable winds. Lows around 77. Chance of showers 20
percent.
.TUESDAY...Partly sunny with isolated showers and thunderstorms.
Then mostly cloudy with scattered island effect showers and isolated
thunderstorms in the afternoon. Northeast winds 5 to 10 mph. Highs
around 87. Chance of showers 40 percent.
.TUESDAY NIGHT...Mostly cloudy with scattered showers and isolated
thunderstorms. Northeast winds 5 to 10 mph. Lows around 75. Chance of
showers 40 percent.
.WEDNESDAY...Mostly cloudy with scattered showers and isolated
thunderstorms. Northeast winds 10 mph. Highs around 87. Chance of
showers 30 percent.
.WEDNESDAY NIGHT...Mostly cloudy with a 30 percent chance of showers
and a slight chance of thunderstorms. Lows in the mid 70s.
.THURSDAY...Partly sunny with a 20 percent chance of showers. Highs
in the upper 80s.
.THURSDAY NIGHT...Mostly cloudy with a 30 percent chance of showers
and a slight chance of thunderstorms. Lows in the mid 70s.
.FRIDAY...Partly sunny with a 20 percent chance of showers. Highs in
the upper 80s.
.FRIDAY NIGHT THROUGH SUNDAY...Mostly cloudy with a 30 percent chance
of showers and a slight chance of thunderstorms. Lows in the mid
70s. Highs in the upper 80s.

$$

MPZ001-170815-
Rota-
518 AM ChST Mon Aug 17 2026

.TODAY...Partly sunny with scattered showers and isolated
thunderstorms. West winds 5 to 10 mph. Highs around 86. Chance of
showers 30 percent.
.TONIGHT...Mostly cloudy with isolated showers and thunderstorms.
Light and variable winds. Lows around 77. Chance of showers 20
percent.
.TUESDAY...Partly cloudy with isolated showers and thunderstorms.
Light and variable winds becoming north at 5 to 10 mph in the
afternoon. Highs around 87. Chance of showers 20 percent.
.TUESDAY NIGHT...Mostly cloudy. Scattered showers and isolated
thunderstorms. North winds 5 to 10 mph. Lows around 76. Chance of
showers 40 percent.
.WEDNESDAY THROUGH THURSDAY...Mostly cloudy. A 30 percent chance of
showers and a slight chance of thunderstorms. Lows in the mid 70s.
Highs in the mid 80s.
.THURSDAY NIGHT THROUGH FRIDAY...Mostly cloudy with a 20 percent
chance of showers. Lows in the mid 70s. Highs in the mid 80s.
.FRIDAY NIGHT AND SATURDAY...Mostly cloudy. A 20 percent chance of
showers and thunderstorms. Lows in the mid 70s. Highs in the mid
80s.
.SATURDAY NIGHT...Mostly cloudy with a 30 percent chance of showers
and a slight chance of thunderstorms. Lows in the mid 70s.
.SUNDAY...Breezy. Partly sunny with a 20 percent chance of showers
and thunderstorms. Highs in the mid 80s.

$$