


Zone Forecast Product
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
323 FPMY50 PGUM 311729 ZFPGUM Zone Forecast for Guam and the Northern Marianas National Weather Service Tiyan GU 329 AM ChST Fri Aug 1 2025 GUZ001-MPZ001>003-010800- Guam-Rota-Tinian-Saipan- 329 AM ChST Fri Aug 1 2025 .TODAY...Partly sunny with scattered showers in the early morning, becoming cloudy with numerous showers and isolated thunderstorms before noon. Locally heavy showers possible. Light and variable winds becoming north around 10 mph with gusts to 25 mph in the afternoon. Highs near 86. Chance of showers 60 percent. .TONIGHT...Mostly cloudy with scattered showers and isolated thunderstorms. Light and variable winds. Lows around 78. Chance of showers 40 percent. .SATURDAY AND SATURDAY NIGHT...Mostly cloudy. Scattered showers and isolated thunderstorms. North to northeast winds 5 to 15 mph. Highs around 87. Lows around 78. Chance of showers 30 percent. .SUNDAY AND SUNDAY NIGHT...Mostly cloudy with scattered showers and isolated thunderstorms. Northeast to east winds 5 to 15 mph. Highs around 87. Chance of showers 30 percent. .MONDAY THROUGH THURSDAY...Mostly cloudy with a chance of showers and a slight chance of thunderstorms. Highs in the upper 80s. Lows in the upper 70s. Chance of showers 30 percent. $$