625
FPMY50 PGUM 200514
ZFPGUM

Zone Forecast for Guam and the Northern Marianas
National Weather Service Tiyan GU
314 PM ChST Sun Sep 20 2026

GUZ001-MPZ001-202000-
Guam-Rota-
314 PM ChST Sun Sep 20 2026

.TONIGHT...Mostly cloudy. Isolated showers becoming scattered
showers and isolated thunderstorms near midnight. Light and variable
winds. Lows around 77. Chance of showers 50 percent.
.MONDAY AND MONDAY NIGHT...Mostly cloudy with scattered showers and
isolated thunderstorms. Light and variable winds becoming south winds
10 to 15 mph in the afternoon. Highs around 88. Lows around 77.
Chance of showers 40 percent.
.TUESDAY AND TUESDAY NIGHT...Cloudy with numerous locally heavy
showers and isolated thunderstorms. South winds 10 to 15 mph. Highs
around 86. Lows around 77. Chance of showers 60 percent.
.WEDNESDAY...Mostly cloudy with scattered showers and isolated
thunderstorms. South winds 15 to 20 mph. Highs around 86. Chance of
showers 50 percent.
.WEDNESDAY NIGHT THROUGH SUNDAY...Mostly cloudy with a 50 percent
chance of showers and a slight chance of thunderstorms. Lows in the
upper 70s. Highs in the mid 80s.

$$

MPZ002-003-202000-
Tinian-Saipan-
314 PM ChST Sun Sep 20 2026

.TONIGHT...Mostly cloudy. Isolated showers becoming scattered
showers and isolated thunderstorms near midnight. Light and variable
winds becoming east around 10 mph after midnight. Lows around 78.
Chance of showers 40 percent.
.MONDAY...Partly sunny with scattered showers and isolated
thunderstorms. Southeast winds 10 to 15 mph. Highs around 88. Chance
of showers 30 percent.
.MONDAY NIGHT...Partly cloudy with isolated showers. Southeast winds
10 to 15 mph. Lows around 78. Chance of showers 20 percent.
.TUESDAY THROUGH WEDNESDAY...Mostly cloudy with scattered showers
and isolated thunderstorms. South winds 15 to 20 mph. Highs around
88. Lows around 78. Chance of showers 50 percent.
.WEDNESDAY NIGHT THROUGH SUNDAY...Mostly cloudy. A 40 percent chance
of showers. Lows in the upper 70s. Highs in the upper 80s.

$$