613 

FLUS45 KMSO 181821

AFPMSO



Area Forecast for Montana west of the Continental Divide

National Weather Service Missoula MT

1221 PM MDT Mon May 18 2026



MTZ001>007-043-191500-

West of the Continental Divide-

National Weather Service Missoula MT

1221 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. 



$$








806 

FPUS65 KTFX 181833

AFPTFX



Central and Southwest Montana Area Forecast

National Weather Service Great Falls MT

1233 PM MDT Mon May 18 2026



MTZ301>314-316>318-190000-

Central Montana-

National Weather Service Great Falls MT

1233 PM MDT Mon May 18 2026





.REST OF TODAY...Partly cloudy. Highs 50 to 55...35 to 45 in the

mountains. 

.TONIGHT...Partly cloudy. Lows 25 to 30. 

.TUESDAY...Increasing clouds. Slight chance of showers and

thunderstorms in the afternoon and evening. Highs 60 to 65...

45 to 55 in the mountains. 

.WEDNESDAY...Rain showers and slight chance of thunderstorms.

Lows 35 to 40. 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. 



$$



MTZ315-319>330-190000-

Southwest Montana-

National Weather Service Great Falls MT

1233 PM MDT Mon May 18 2026





.REST OF TODAY...Partly cloudy. Highs 45 to 55...35 to 45 in the

mountains. 

.TONIGHT...Mostly clear. Lows 20 to 30...15 to 25 in the

mountains. 

.TUESDAY...Sunny then becoming partly cloudy in the afternoon

then becoming mostly cloudy. Slight chance of rain showers in the

afternoon and evening. Highs 55 to 60...45 to 55 in the

mountains. 

.WEDNESDAY...Rain showers and slight chance of thunderstorms.

Lows 30 to 35. 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. 



$$








010 

FLUS45 KGGW 181837

AFPGGW



Northeast Montana Area Forecast

National Weather Service Glasgow MT

1237 PM MDT Mon May 18 2026



MTZ016>027-059>062-190000-

Northeast Montana-

1237 PM MDT Mon May 18 2026



.REST OF TODAY...Mostly cloudy. Highs in the mid to upper 40s. 

.TONIGHT...Partly cloudy. Lows in the mid to upper 20s. 

.TUESDAY...Sunny in the morning then becoming partly cloudy.

Highs in the lower to mid 60s. 

.WEDNESDAY...Mostly cloudy with a chance of rain showers and a

slight chance of thunderstorms. Highs near 70. 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. 



$$