


Zone Forecast Product
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
445 FPMY50 PGUM 221735 ZFPGUM Zone Forecast for Guam and the Northern Marianas National Weather Service Tiyan GU 335 AM ChST Sat Aug 23 2025 GUZ001-MPZ001>003-230900- Guam-Rota-Tinian-Saipan- 335 AM ChST Sat Aug 23 2025 .TODAY...Partly sunny with scattered showers and isolated thunderstorms. East winds 10 to 15 mph. Highs near 87. Chance of showers 40 percent. .TONIGHT...Mostly cloudy with scattered showers and isolated thunderstorms. East winds around 10 mph in the evening becoming light. Lows around 77. Chance of showers 30 percent. .SUNDAY...Partly sunny with scattered showers and isolated thunderstorms. East winds 10 to 15 mph. Highs near 86. Chance of showers 40 percent. .SUNDAY NIGHT AND MONDAY...Mostly cloudy. Scattered showers and isolated thunderstorms. East winds 10 to 15 mph. Lows around 77. Highs near 88. Chance of showers 40 percent. .MONDAY NIGHT...Mostly cloudy with a 20 percent chance of showers and thunderstorms. Lows in the upper 70s. .TUESDAY THROUGH FRIDAY...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. $$