711  
FPUS65 KTFX 190100  
SFPMT  
 
STATE FORECAST FOR MONTANA  
NATIONAL WEATHER SERVICE GREAT FALLS MT  
700 PM MDT MON MAY 18 2026  
 
MTZ001>007-043-191000-  
WEST OF THE CONTINENTAL DIVIDE-  
NATIONAL WEATHER SERVICE MISSOULA MT  
700 PM MDT MON MAY 18 2026  
 
...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM MDT  
TUESDAY FOR FLATHEAD/MISSION VALLEYS...LOWER CLARK FORK  
REGION...MISSOULA/BITTERROOT VALLEYS...BITTERROOT/SAPPHIRE  
MOUNTAINS...  
   
TONIGHT  
PARTLY CLOUDY WITH A SLIGHT CHANCE OF RAIN. WIDESPREAD  
FROST. LOWS IN THE MID 20S TO LOWER 30S.    
TUESDAY  
PARTLY CLOUDY WITH A CHANCE OF RAIN SHOWERS AND A  
SLIGHT CHANCE OF THUNDERSTORMS. AREAS OF FROST. HIGHS IN THE 60S.   
TUESDAY NIGHT  
PARTLY CLOUDY. LOWS IN THE 30S.    
WEDNESDAY  
MOSTLY CLOUDY. A CHANCE OF RAIN IN THE MORNING, THEN  
RAIN SHOWERS LIKELY IN THE AFTERNOON AND EVENING. HIGHS IN THE  
60S.    
THURSDAY  
PARTLY CLOUDY WITH A CHANCE OF RAIN. LOWS IN THE 30S.  
HIGHS IN THE 60S.    
FRIDAY  
PARTLY CLOUDY. LOWS IN THE 30S TO LOWER 40S. HIGHS IN  
THE UPPER 60S TO MID 70S.    
SATURDAY  
PARTLY CLOUDY. LOWS IN THE MID 30S TO LOWER 40S.  
HIGHS IN THE 70S.  
 
 
 
MTZ301>314-316>318-191000-  
CENTRAL MONTANA-  
NATIONAL WEATHER SERVICE GREAT FALLS MT  
700 PM MDT MON MAY 18 2026  
   
TONIGHT  
PARTLY CLOUDY. LOWS 25 TO 30.    
TUESDAY  
INCREASING CLOUDS. SLIGHT CHANCE OF THUNDERSTORMS IN  
THE AFTERNOON. HIGHS 60 TO 65...45 TO 55 IN THE MOUNTAINS.    
TUESDAY NIGHT  
MOSTLY CLOUDY. SLIGHT CHANCE OF RAIN SHOWERS.  
LOWS 35 TO 40.    
WEDNESDAY  
MOSTLY CLOUDY. RAIN SHOWERS AND SLIGHT CHANCE OF  
THUNDERSTORMS. HIGHS 50 TO 60.    
THURSDAY  
PARTLY CLOUDY. CHANCE OF RAIN. LOWS 35 TO 40. HIGHS  
55 TO 65.    
FRIDAY  
PARTLY CLOUDY. LOWS 35 TO 40. HIGHS 60 TO 70.    
SATURDAY  
PARTLY CLOUDY. LOWS 40 TO 45. HIGHS 70 TO 80.  
 
 
MTZ315-319>330-191000-  
SOUTHWEST MONTANA-  
NATIONAL WEATHER SERVICE GREAT FALLS MT  
700 PM MDT MON MAY 18 2026  
   
TONIGHT...MOSTLY CLEAR. LOWS 20 TO 30  
15 TO 25 IN THE  
MOUNTAINS.    
TUESDAY...PARTLY CLOUDY. HIGHS 55 TO 60  
45 TO 55 IN THE  
MOUNTAINS.    
TUESDAY NIGHT  
MOSTLY CLOUDY IN THE EVENING THEN BECOMING  
PARTLY CLOUDY. SLIGHT CHANCE OF RAIN AND SNOW SHOWERS. LOWS 30 TO  
40...25 TO 35 IN THE MOUNTAINS.    
WEDNESDAY  
MOSTLY CLOUDY. RAIN SHOWERS AND SLIGHT CHANCE OF  
THUNDERSTORMS. HIGHS 45 TO 55.    
THURSDAY  
RAIN AND SNOW LIKELY. LOWS 30 TO 35. HIGHS 50 TO 60.    
FRIDAY  
PARTLY CLOUDY. LOWS 30 TO 35. HIGHS 55 TO 65.    
SATURDAY  
PARTLY CLOUDY. LOWS 35 TO 40. HIGHS 65 TO 75.  
 
 
MTZ016>027-059>062-191000-  
NORTHEAST MONTANA-  
NATIONAL WEATHER SERVICE GLASGOW MT  
700 PM MDT MON MAY 18 2026  
   
TONIGHT  
PARTLY CLOUDY. LOWS IN THE MID TO UPPER 20S.    
TUESDAY  
SUNNY. HIGHS IN THE LOWER TO MID 60S.    
TUESDAY NIGHT  
MOSTLY CLOUDY. LOWS NEAR 40.    
WEDNESDAY  
MOSTLY CLOUDY. A CHANCE OF RAIN SHOWERS AND A SLIGHT  
CHANCE OF THUNDERSTORMS IN THE AFTERNOON AND EVENING. HIGHS NEAR  
70.    
THURSDAY  
MOSTLY CLOUDY WITH A CHANCE OF RAIN SHOWERS. HIGHS IN  
THE LOWER TO MID 60S. LOWS NEAR 40.    
FRIDAY  
PARTLY CLOUDY. HIGHS IN THE MID 60S TO LOWER 70S. LOWS  
NEAR 40.    
SATURDAY  
PARTLY CLOUDY. HIGHS IN THE MID TO UPPER 70S. LOWS IN  
THE LOWER TO MID 40S.  
 
 
 
MTZ028>042-056>058-063>068-191000-  
SOUTH CENTRAL AND SOUTHEAST MONTANA-  
NATIONAL WEATHER SERVICE BILLINGS MT  
700 PM MDT MON MAY 18 2026  
   
TONIGHT  
MOSTLY CLEAR. LOWS IN THE LOWER 20S TO THE LOWER 30S.    
TUESDAY  
SUNNY. HIGHS IN THE UPPER 50S TO THE UPPER 60S.    
TUESDAY NIGHT  
PARTLY CLOUDY. LOWS IN THE LOWER 30S TO THE  
LOWER 40S.    
WEDNESDAY  
MOSTLY SUNNY. CHANCE OF RAIN SHOWERS. HIGHS IN THE  
MID 60S TO LOWER 70S.    
WEDNESDAY NIGHT  
SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS  
WEST...AND CHANCE OF SHOWERS EAST. LOWS IN THE MID 30S TO THE MID  
40S.    
THURSDAY  
MOSTLY CLOUDY. SHOWERS, SNOW SHOWERS LIKELY AND  
SLIGHT CHANCE OF THUNDERSTORMS WEST...AND CHANCE OF SHOWERS AND  
SLIGHT CHANCE OF THUNDERSTORMS EAST. HIGHS IN THE MID 50S TO THE  
MID 60S.    
THURSDAY NIGHT  
MOSTLY CLOUDY. SLIGHT CHANCE OF RAIN SHOWERS.  
LOWS IN THE LOWER 30S TO THE LOWER 40S.    
FRIDAY  
MOSTLY SUNNY. SLIGHT CHANCE OF RAIN SHOWERS. HIGHS IN  
THE LOWER 60S TO THE LOWER 70S.    
FRIDAY NIGHT  
PARTLY CLOUDY. LOWS IN THE MID 30S TO THE MID  
40S.    
SATURDAY  
SUNNY. HIGHS IN THE LOWER 70S TO THE LOWER 80S.  
 
 
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