FPMY50 PGUM 210548 ZFPGUM Zone Forecast for Guam and the Northern Marianas National Weather Service Tiyan GU 348 PM ChST Sun Jun 21 2026 GUZ001-MPZ001-212145- Guam-Rota- 348 PM ChST Sun Jun 21 2026 .TONIGHT...Partly cloudy with isolated showers. Light and variable winds. Lows around 79. Chance of showers 20 percent. .MONDAY...Partly sunny. Isolated showers in the morning, becoming scattered showers and isolated thunderstorms in the afternoon. Light and variable winds. Highs around 88. Chance of showers 30 percent. .MONDAY NIGHT...Partly cloudy with isolated showers. Light and variable winds. Lows around 79. Chance of showers 20 percent. .TUESDAY AND TUESDAY NIGHT...Mostly cloudy. Scattered showers and isolated thunderstorms. Northeast winds 5 to 10 mph with gusts up to 15 mph. Highs around 87. Lows around 78. Chance of showers 30 percent. .WEDNESDAY...Partly cloudy with isolated showers. Southeast winds 5 to 10 mph. Highs around 88. Chance of showers 20 percent. .WEDNESDAY NIGHT AND THURSDAY...Partly cloudy with a 20 percent chance of showers. Lows in the upper 70s. Highs in the upper 80s. .THURSDAY NIGHT...Mostly cloudy with a 20 percent chance of showers. Lows in the upper 70s. .FRIDAY...Partly sunny with a 30 percent chance of showers. Highs in the upper 80s. .FRIDAY NIGHT THROUGH SUNDAY...Partly cloudy with a 20 percent chance of showers. Lows in the upper 70s. Highs in the upper 80s. $$ MPZ002-003-212145- Tinian-Saipan- 348 PM ChST Sun Jun 21 2026 .TONIGHT...Partly cloudy with isolated showers. Light and variable winds. Lows around 79. Chance of showers 20 percent. .MONDAY...Partly sunny. Isolated showers in the morning, becoming scattered showers and isolated thunderstorms in the afternoon. Light and variable winds. Highs around 88. Chance of showers 30 percent. .MONDAY NIGHT...Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Isolated thunderstorms. Light and variable winds becoming northeast 5 to 10 mph after midnight. Lows around 78. Chance of showers 30 percent. .TUESDAY...Mostly cloudy with scattered showers and isolated thunderstorms. Northeast winds 10 to 15 mph with gusts up to 20 mph. Highs around 87. Chance of showers 40 percent. .TUESDAY NIGHT...Mostly cloudy with scattered showers and isolated thunderstorms. Southeast winds 10 to 15 mph with gusts up to 20 mph. Lows around 78. Chance of showers 30 percent. .WEDNESDAY...Partly sunny with isolated showers. Southeast winds 10 to 15 mph. Highs around 88. Chance of showers 20 percent. .WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Mostly cloudy with a 20 percent chance of showers. Lows in the upper 70s. Highs in the upper 80s. .FRIDAY...Partly sunny with a 30 percent chance of showers. Highs in the upper 80s. .FRIDAY NIGHT THROUGH SUNDAY...Partly cloudy with a 20 percent chance of showers. Lows in the upper 70s. Highs in the upper 80s. $$