FPUS65 KTFX 181230
SFPMT 

State Forecast For Montana
National Weather Service Great Falls MT
630 AM MDT Mon May 18 2026

MTZ001>007-043-182200-
West of the Continental Divide- 
National Weather Service Missoula MT 
630 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
630 AM MDT Mon May 18 2026

.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
630 AM MDT Mon May 18 2026

.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
630 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
630 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. 

$$