040  
FPUS65 KTFX 181300  
SFPMT  
 
STATE FORECAST FOR MONTANA  
NATIONAL WEATHER SERVICE GREAT FALLS MT  
700 AM MDT MON MAY 18 2026  
 
MTZ001>007-043-182200-  
WEST OF THE CONTINENTAL DIVIDE-  
NATIONAL WEATHER SERVICE MISSOULA MT  
700 AM MDT MON MAY 18 2026  
 
...FROST ADVISORY IN EFFECT UNTIL 8 AM MDT THIS MORNING FOR  
KOOTENAI/CABINET REGION...LOWER CLARK FORK REGION...  
...FROST ADVISORY IN EFFECT UNTIL 9 AM MDT THIS MORNING FOR  
FLATHEAD/MISSION VALLEYS...MISSOULA/BITTERROOT VALLEYS...  
   
TODAY
 
PARTLY CLOUDY WITH A CHANCE OF RAIN SHOWERS AND A SLIGHT  
CHANCE OF THUNDERSTORMS. WIDESPREAD FROST. HIGHS IN THE MID 50S  
TO LOWER 60S.    
TONIGHT
 
PARTLY CLOUDY WITH A SLIGHT CHANCE OF RAIN. WIDESPREAD  
FROST. LOWS IN THE UPPER 20S TO MID 30S.    
TUESDAY
 
PARTLY CLOUDY. AREAS OF FROST IN THE MORNING. HIGHS IN  
THE 60S.    
WEDNESDAY
 
MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS. LOWS IN THE  
30S. HIGHS IN THE 60S.    
THURSDAY
 
PARTLY CLOUDY. LOWS IN THE 30S. HIGHS IN THE MID 60S  
TO LOWER 70S.    
FRIDAY
 
PARTLY CLOUDY. LOWS IN THE MID 30S TO LOWER 40S. HIGHS  
IN THE UPPER 60S TO MID 70S.  
 

 
 
MTZ301>314-316>318-182200-  
CENTRAL MONTANA-  
NATIONAL WEATHER SERVICE GREAT FALLS MT  
700 AM MDT MON MAY 18 2026  
   
REST OF TODAY
 
PARTLY CLOUDY. PATCHY FOG IN THE MORNING. HIGHS  
45 TO 55...35 TO 45 IN THE MOUNTAINS.    
TONIGHT
 
MOSTLY CLEAR. LOWS 25 TO 30.    
TUESDAY
 
INCREASING CLOUDS. SLIGHT CHANCE OF RAIN IN THE  
AFTERNOON AND EVENING. HIGHS 60 TO 65...45 TO 55 IN THE  
MOUNTAINS.    
WEDNESDAY
 
MOSTLY CLOUDY. CHANCE OF RAIN. LOWS 35 TO 40. HIGHS  
55 TO 65.    
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.  

 
 
MTZ315-319>330-182200-  
SOUTHWEST MONTANA-  
NATIONAL WEATHER SERVICE GREAT FALLS MT  
700 AM MDT MON MAY 18 2026  
   
REST OF TODAY
 
PARTLY CLOUDY. SLIGHT CHANCE OF SNOW IN THE  
MORNING. HIGHS 40 TO 50...30 TO 40 IN THE MOUNTAINS. GUSTS UP TO  
35 MPH IN THE MORNING.    
TONIGHT...MOSTLY CLEAR. LOWS 20 TO 30
 
15 TO 25 IN THE  
MOUNTAINS.    
TUESDAY
 
INCREASING CLOUDS IN THE AFTERNOON THEN BECOMING  
PARTLY CLOUDY. SLIGHT CHANCE OF RAIN AND SNOW IN THE AFTERNOON  
AND EVENING. HIGHS 50 TO 60...40 TO 50 IN THE MOUNTAINS.    
WEDNESDAY
 
PARTLY CLOUDY. CHANCE OF RAIN. LOWS 25 TO 35. HIGHS  
50 TO 60.    
THURSDAY
 
PARTLY CLOUDY. CHANCE OF RAIN AND SNOW. LOWS 30 TO  
35. HIGHS 50 TO 60.    
FRIDAY
 
PARTLY CLOUDY. LOWS 30 TO 40. HIGHS 55 TO 65.  

 
 
MTZ016>027-059>062-182200-  
NORTHEAST MONTANA-  
NATIONAL WEATHER SERVICE GLASGOW MT  
700 AM MDT MON MAY 18 2026  
   
TODAY
 
MOSTLY CLOUDY WITH A SLIGHT CHANCE OF RAIN SHOWERS.  
HIGHS IN THE MID TO UPPER 40S.    
TONIGHT
 
MOSTLY CLOUDY. LOWS IN THE MID 20S TO LOWER 30S.    
TUESDAY
 
PARTLY CLOUDY. HIGHS IN THE LOWER TO MID 60S.    
WEDNESDAY
 
MOSTLY CLOUDY WITH A SLIGHT CHANCE OF RAIN SHOWERS.  
HIGHS IN THE MID 60S TO LOWER 70S. LOWS NEAR 40.    
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.  
 

 
 
MTZ028>042-056>058-063>068-182200-  
SOUTH CENTRAL AND SOUTHEAST MONTANA-  
NATIONAL WEATHER SERVICE BILLINGS MT  
700 AM MDT MON MAY 18 2026  
 
...WINTER WEATHER ADVISORY IN EFFECT UNTIL NOON MDT TODAY FOR  
PORTIONS OF SOUTH CENTRAL MONTANA...  
   
TODAY
 
CLOUDY. PATCHY BLOWING SNOW. SLIGHT CHANCE OF RAIN  
SHOWERS AND SNOW SHOWERS. HIGHS IN THE MID 40S TO LOWER 50S.    
TONIGHT
 
PARTLY CLOUDY. LOWS IN THE MID 20S TO AROUND 30.    
TUESDAY
 
SUNNY. HIGHS IN THE UPPER 50S TO THE UPPER 60S.    
TUESDAY NIGHT
 
PARTLY CLOUDY. LOWS IN THE MID 30S TO THE MID  
40S.    
WEDNESDAY
 
MOSTLY SUNNY. CHANCE OF RAIN SHOWERS. HIGHS IN THE  
MID 60S TO LOWER 70S.    
WEDNESDAY NIGHT
 
MOSTLY CLOUDY. SHOWERS LIKELY AND SLIGHT  
CHANCE OF THUNDERSTORMS WEST...AND CHANCE OF SHOWERS EAST. LOWS  
IN THE MID 30S TO THE MID 40S.    
THURSDAY
 
PARTLY SUNNY. CHANCE OF RAIN SHOWERS AND SLIGHT  
CHANCE OF THUNDERSTORMS. HIGHS IN THE UPPER 50S TO MID 60S.    
THURSDAY NIGHT
 
PARTLY CLOUDY. SLIGHT CHANCE OF RAIN SHOWERS.  
LOWS IN THE MID 30S TO THE MID 40S.    
FRIDAY...MOSTLY SUNNY. SLIGHT CHANCE OF THUNDERSTORMS WEST
 
AND  
SLIGHT CHANCE OF SHOWERS EAST. HIGHS IN THE MID 60S TO THE MID  
70S.  
 

 
 
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