FPMY50 PGUM 220527 ZFPGUM Zone Forecast for Guam and the Northern Marianas National Weather Service Tiyan GU 327 PM ChST Sat Aug 22 2026 GUZ001-MPZ001-222045- Guam-Rota- 327 PM ChST Sat Aug 22 2026 ...HIGH RIP CURRENT RISK IN EFFECT THROUGH SUNDAY AFTERNOON ALONG EAST FACING REEFS... .TONIGHT...Mostly cloudy with scattered showers and isolated thunderstorms. Southwest winds 10 to 15 mph. Locally heavy rainfall possible. Lows around 78. Chance of showers 30 percent. .SUNDAY...Breezy. Partly sunny with scattered showers and isolated thunderstorms. Southwest winds 15 to 20 mph. Locally heavy rainfall possible. Highs around 87. Chance of showers 30 percent. .SUNDAY NIGHT...Mostly cloudy with scattered showers and isolated thunderstorms. Southwest winds 10 to 15 mph. Locally heavy rainfall possible. Lows around 78. Chance of showers 50 percent. .MONDAY THROUGH TUESDAY...Breezy. Mostly cloudy with scattered showers and isolated thunderstorms. Southwest winds 15 to 20 mph. Locally heavy rainfall possible. Highs around 85. Lows around 78. Chance of showers 40 percent. .TUESDAY NIGHT...Breezy. Mostly cloudy with a chance of showers and a slight chance of thunderstorms. Lows in the upper 70s. Chance of showers 50 percent. .WEDNESDAY THROUGH THURSDAY NIGHT...Mostly cloudy with showers likely and a slight chance of thunderstorms. Highs in the lower to mid 80s. Lows in the mid to upper 70s. Chance of showers 60 percent. .FRIDAY THROUGH SATURDAY...Breezy. Mostly cloudy with a chance of showers and a slight chance of thunderstorms. Highs in the mid 80s. Lows in the upper 70s. Chance of showers 40 percent. $$ MPZ002-003-222045- Tinian-Saipan- 327 PM ChST Sat Aug 22 2026 ...HIGH SURF ADVISORY IN EFFECT UNTIL 5 PM CHST SUNDAY ALONG NORTH FACING REEFS... ...HIGH RIP CURRENT RISK IN EFFECT THROUGH SUNDAY AFTERNOON ALONG NORTH AND EAST FACING REEFS... .TONIGHT...Mostly cloudy with scattered showers. Southwest winds 10 to 15 mph. Locally heavy rainfall possible. Lows around 79. Chance of showers 30 percent. .SUNDAY...Partly sunny with scattered showers and thunderstorms. Southwest winds 10 to 15 mph. Locally heavy rainfall possible. Highs around 87. Chance of showers 30 percent. .SUNDAY NIGHT...Mostly cloudy with scattered showers and isolated thunderstorms. Southwest winds around 10 mph in the evening becoming light. Locally heavy rainfall possible. Lows around 80. Chance of showers 40 percent. .MONDAY AND MONDAY NIGHT...Mostly cloudy. Scattered showers and isolated thunderstorms. South winds 10 to 15 mph. Locally heavy rainfall possible. Highs around 87. Lows around 80. Chance of showers 50 percent. .TUESDAY...Mostly cloudy with scattered showers and isolated thunderstorms. Light and variable winds. Locally heavy rainfall possible. Highs around 86. Chance of showers 50 percent. .TUESDAY NIGHT THROUGH WEDNESDAY NIGHT...Mostly cloudy with a chance of showers and a slight chance of thunderstorms. Lows in the mid to upper 70s. Highs in the mid 80s. Chance of showers 50 percent. .THURSDAY THROUGH SATURDAY...Mostly cloudy with a chance of showers and a slight chance of thunderstorms. Highs in the mid 80s. Lows in the upper 70s. Chance of showers 50 percent. $$