378  
FPMY50 PGUM 201737  
ZFPGUM  
 
ZONE FORECAST FOR GUAM AND THE NORTHERN MARIANAS  
NATIONAL WEATHER SERVICE TIYAN GU  
337 AM CHST THU AUG 21 2025  
 
GUZ001-MPZ001-210845-  
GUAM-ROTA-  
337 AM CHST THU AUG 21 2025  
   
TODAY
 
PARTLY SUNNY. SCATTERED SHOWERS FOR GUAM AND ISOLATED  
SHOWERS FOR ROTA. ISOLATED THUNDERSTORMS. NORTHEAST WINDS 10 TO 15  
MPH. HIGHS AROUND 88. CHANCE OF SHOWERS 30 PERCENT FOR GUAM, 20  
PERCENT FOR ROTA.   
TONIGHT
 
MOSTLY CLOUDY WITH SCATTERED SHOWERS AND ISOLATED  
THUNDERSTORMS. EAST WINDS 10 TO 15 MPH. LOWS AROUND 79. CHANCE OF  
SHOWERS 30 PERCENT.    
FRIDAY
 
PARTLY SUNNY WITH SCATTERED SHOWERS AND ISOLATED  
THUNDERSTORMS. EAST WINDS 10 TO 15 MPH. HIGHS AROUND 87. CHANCE OF  
SHOWERS 30 PERCENT.    
FRIDAY NIGHT
 
PARTLY CLOUDY WITH ISOLATED SHOWERS AND  
THUNDERSTORMS. LIGHT AND VARIABLE WINDS. LOWS AROUND 79. CHANCE OF  
SHOWERS 20 PERCENT.   
SATURDAY
 
PARTLY SUNNY WITH ISOLATED SHOWERS AND THUNDERSTORMS.  
LIGHT AND VARIABLE WINDS BECOMING EAST AROUND 10 MPH IN THE  
AFTERNOON. HIGHS AROUND 87. CHANCE OF SHOWERS 20 PERCENT.   
SATURDAY NIGHT AND SUNDAY
 
PARTLY CLOUDY WITH A 20 PERCENT CHANCE  
OF SHOWERS AND THUNDERSTORMS. LOWS IN THE UPPER 70S. HIGHS IN THE  
MID 80S.   
SUNDAY NIGHT
 
MOSTLY CLOUDY WITH A 20 PERCENT CHANCE OF SHOWERS  
AND THUNDERSTORMS. LOWS AROUND 78.   
MONDAY THROUGH WEDNESDAY
 
MOSTLY CLOUDY WITH A 40 PERCENT CHANCE  
OF SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS. HIGHS IN THE UPPER  
80S. LOWS IN THE UPPER 70S.  
 

 
 
MPZ002-003-210845-  
TINIAN-SAIPAN-  
337 AM CHST THU AUG 21 2025  
   
TODAY
 
PARTLY CLOUDY WITH ISOLATED SHOWERS. EAST WINDS 10 TO  
15 MPH. HIGHS AROUND 87. CHANCE OF SHOWERS 20 PERCENT.   
TONIGHT
 
PARTLY CLOUDY WITH ISOLATED SHOWERS. EAST WINDS 10 TO  
15 MPH. LOWS AROUND 78. CHANCE OF SHOWERS 20 PERCENT.   
FRIDAY
 
PARTLY SUNNY WITH SCATTERED SHOWERS AND ISOLATED  
THUNDERSTORMS. EAST WINDS 10 TO 15 MPH. HIGHS AROUND 87. CHANCE OF  
SHOWERS 30 PERCENT.   
FRIDAY NIGHT AND SATURDAY
 
PARTLY CLOUDY WITH ISOLATED SHOWERS AND  
THUNDERSTORMS. EAST WINDS 10 TO 15 MPH. LOWS AROUND 78. HIGHS AROUND  
87. CHANCE OF SHOWERS 20 PERCENT.   
SATURDAY NIGHT AND SUNDAY
 
MOSTLY CLOUDY. A 20 PERCENT CHANCE OF  
SHOWERS. LOWS IN THE UPPER 70S. HIGHS IN THE MID 80S.   
SUNDAY NIGHT
 
PARTLY CLOUDY WITH A 20 PERCENT CHANCE OF SHOWERS.  
LOWS IN THE UPPER 70S.   
MONDAY
 
PARTLY SUNNY WITH A 20 PERCENT CHANCE OF SHOWERS AND  
THUNDERSTORMS. HIGHS IN THE UPPER 80S.    
MONDAY NIGHT THROUGH WEDNESDAY
 
MOSTLY CLOUDY WITH A 40 PERCENT  
CHANCE OF SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS. LOWS IN THE  
UPPER 70S. HIGHS IN THE UPPER 80S. CHANCE OF SHOWERS 40 PERCENT.  
 

 
 
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