FPMY50 PGUM 090557 ZFPGUM Zone Forecast for Guam and the Northern Marianas National Weather Service TIYAN GU 357 PM ChST Fri May 9 2025 GUZ001-MPZ001>003-092100- Guam-Rota-Tinian-Saipan- 357 PM ChST Fri May 9 2025 .TONIGHT...Partly cloudy with isolated showers. East winds 15 to 20 mph. Lows around 78. Chance of showers 20 percent. .SATURDAY...Partly cloudy with isolated light showers. East winds 15 to 20 mph. Highs around 88. Chance of showers 10 percent. .SATURDAY NIGHT THROUGH MONDAY...Partly cloudy with isolated showers. East winds 15 to 20 mph. Lows around 78. Highs around 88. Chance of showers 20 percent. .MONDAY NIGHT THROUGH FRIDAY...Partly cloudy with a 20 percent chance of showers. Lows in the upper 70s. Highs in the upper 80s. $$