FPUS65 KTFX 190343 SFPMT State Forecast For Montana National Weather Service Great Falls MT 943 PM MDT Mon Aug 18 2025 MTZ001>007-043-191000- West of the Continental Divide- National Weather Service Missoula MT 943 PM MDT Mon Aug 18 2025 .TONIGHT...Mostly clear. Lows in the upper 40s to mid 50s. .TUESDAY...Mostly sunny. Highs in the upper 80s to mid 90s. .TUESDAY NIGHT...Partly cloudy with a chance of rain showers. Lows in the upper 40s to mid 50s. .WEDNESDAY...Mostly clear. Highs in the mid 80s to lower 90s. .THURSDAY...Mostly clear. Lows in the mid 40s to lower 50s. Highs in the 80s. .FRIDAY...Clear. Lows in the mid 40s to lower 50s. Highs in the 80s to lower 90s. .SATURDAY...Mostly clear. Lows in the mid 40s to lower 50s. Highs in the upper 80s to mid 90s. $$ MTZ301>314-316>318-191000- Central Montana- National Weather Service Great Falls MT 943 PM MDT Mon Aug 18 2025 .REST OF TONIGHT...Mostly clear. Slight chance of showers and thunderstorms in the evening. Lows 55 to 60. .TUESDAY...Sunny. Highs 90 to 95...80 to 90 in the mountains. .TUESDAY NIGHT...Partly cloudy. Slight chance of showers and thunderstorms. Lows 55 to 65...50 to 60 in the mountains. .WEDNESDAY...Mostly clear. Slight chance of showers and thunderstorms. Highs 85 to 95. .THURSDAY...Mostly clear. Slight chance of rain showers. Lows 50 to 60. Highs 75 to 80. .FRIDAY...Mostly clear. Lows 50 to 55. Highs 70 to 80. .SATURDAY...Mostly clear. Lows 50 to 55. Highs 75 to 85. $$ MTZ315-319>330-191000- Southwest Montana- National Weather Service Great Falls MT 943 PM MDT Mon Aug 18 2025 .REST OF TONIGHT...Partly cloudy. Slight chance of showers and thunderstorms in the evening. Lows 50 to 55. .TUESDAY...Sunny. Highs 85 to 95...75 to 85 in the mountains. .TUESDAY NIGHT...Mostly clear. Lows 50 to 60. .WEDNESDAY...Partly cloudy. Slight chance of showers and thunderstorms. Highs 80 to 90. .THURSDAY...Mostly clear. Lows 45 to 55. Highs 70 to 80. .FRIDAY...Mostly clear. Lows 45 to 50. Highs 75 to 85. .SATURDAY...Mostly clear. Lows 45 to 50. Highs 75 to 85. $$ MTZ016>027-059>062-191000- Northeast Montana- National Weather Service Glasgow MT 943 PM MDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT FROM 10 AM TUESDAY TO 8 PM MDT WEDNESDAY... .TONIGHT...Mostly clear. Lows in the lower to mid 60s. .TUESDAY...Sunny. Highs 96 to 101. .TUESDAY NIGHT...Mostly clear. Lows in the mid 60s to lower 70s. .WEDNESDAY...Sunny in the morning, then mostly clear with a slight chance of showers and thunderstorms in the afternoon and evening. Highs 97 to 102. .THURSDAY...Partly cloudy with a slight chance of showers. Highs in the lower to mid 80s. Lows in the 60s. .FRIDAY...Mostly clear. Highs in the mid to upper 70s. Lows in the 50s. .SATURDAY...Mostly clear. Highs in the mid 70s to lower 80s. Lows in the upper 40s to mid 50s. $$ MTZ028>042-056>058-063>068-191000- South Central and Southeast Montana- National Weather Service Billings MT 943 PM MDT Mon Aug 18 2025 ...Heat Advisory in effect from 9 AM Tuesday to 9 PM MDT Wednesday for portions of South Central Montana... and all of Southeast Montana... .REST OF TONIGHT...Mostly clear. Lows in the mid 50s to upper 60s. .TUESDAY...Sunny. Highs 95 to 103. .TUESDAY NIGHT...Mostly clear. Lows in the upper 50s to lower 70s. .WEDNESDAY...Sunny. Highs 93 to 103. .WEDNESDAY NIGHT...Partly cloudy. Slight chance of rain showers. Lows in the mid 50s to around 70. .THURSDAY...Sunny. Highs in the 80s. .THURSDAY NIGHT...Partly cloudy. Slight chance of showers west... and slight chance of showers and isolated thunderstorms east. Lows in the lower 50s to around 60. .FRIDAY AND FRIDAY NIGHT...Mostly clear. Slight chance of rain showers. Lows in the upper 40s to the upper 50s. Highs in the mid 70s to the mid 80s. .SATURDAY...Sunny. Highs in the upper 70s to the upper 80s. $$