FPMY50 PGUM 201654 ZFPGUM Zone Forecast for Guam and the Northern Marianas National Weather Service Tiyan GU 254 AM ChST Tue Apr 21 2026 GUZ001-MPZ001>003-210815- Guam-Rota-Tinian-Saipan- 254 AM ChST Tue Apr 21 2026 .TODAY...Mostly sunny with isolated light showers. Northeast winds 10 to 15 mph. Highs around 87. Chance of showers 10 percent. .TONIGHT...Partly cloudy with isolated light showers. Northeast winds 10 to 15 mph. Lows around 77. Chance of showers 10 percent. .WEDNESDAY...Partly cloudy with isolated light showers. Northeast winds 10 to 15 mph. Highs around 87. Chance of showers 10 percent. .WEDNESDAY NIGHT AND THURSDAY...Breezy. Partly cloudy. Isolated showers. East winds 15 to 20 mph. Lows around 77. Highs around 87. Chance of showers 10 percent. .THURSDAY NIGHT...Partly cloudy with a 10 percent chance of light showers. Lows in the upper 70s. .FRIDAY THROUGH MONDAY...Breezy. Mostly cloudy with a 20 percent chance of showers. Highs in the upper 80s. Lows in the upper 70s. $$