FPUS65 KTFX 180931 SFTTFX MTZ301>330-182300- Tabular State Forecast for North Central and Southwest Montana National Weather Service Great Falls MT 331 AM MDT Mon May 18 2026 ROWS INCLUDE... Daily predominant daytime weather 6AM-6PM Forecast temperatures...early morning low/daytime high Probability of precipitation nighttime 6PM-6AM/daytime 6AM-6PM - indicates temperatures below zero MM indicates missing data FCST FCST FCST FCST FCST FCST FCST Today Tue Wed Thu Fri Sat Sun May 18 May 19 May 20 May 21 May 22 May 23 May 24 ...CENTRAL MONTANA... Great Falls Ptcldy Ptcldy Rain Ptcldy Ptcldy Ptcldy Ptcldy /52 29/63 40/61 38/64 41/69 44/75 48/77 /10 00/30 10/60 60/10 10/10 00/00 00/00 Cut Bank Ptcldy Ptcldy Rain Ptcldy Ptcldy Sunny Sunny /54 31/63 38/57 34/64 39/67 40/72 43/73 /20 10/20 10/60 40/00 10/20 00/00 00/10 Havre Ptcldy Rain Mocldy Ptcldy Ptcldy Sunny Ptcldy /54 26/66 41/64 36/66 39/70 42/77 46/79 /10 00/50 10/40 30/10 10/10 10/00 10/10 Helena Ptcldy Ptcldy Ptcldy Ptcldy Ptcldy Ptcldy Sunny /55 29/62 38/65 38/65 39/70 41/75 44/78 /10 10/20 00/30 70/10 00/10 00/00 00/00 Lewistown Mocldy Ptcldy Rain Ptcldy Ptcldy Sunny Ptcldy /46 23/59 36/59 35/59 36/64 39/71 43/74 /40 00/30 00/50 70/30 10/20 10/00 10/10 Shelby Ptcldy Ptcldy Rain Ptcldy Ptcldy Sunny Ptcldy /55 28/64 40/60 36/65 40/69 41/74 45/75 /10 10/30 10/50 40/00 10/10 00/00 10/00 Chester Ptcldy Ptcldy Rain Ptcldy Ptcldy Sunny Sunny /54 27/65 38/61 35/65 38/69 40/75 43/77 /10 00/30 10/50 30/10 10/10 10/00 00/10 Chinook Ptcldy Ptcldy Ptcldy Ptcldy Ptcldy Sunny Ptcldy /53 25/65 41/64 37/66 39/71 42/77 46/79 /10 00/30 10/40 30/10 10/10 10/00 10/10 Conrad Ptcldy Ptcldy Rain Ptcldy Ptcldy Sunny Ptcldy /55 28/65 39/60 35/65 39/69 41/74 44/76 /20 10/20 00/70 50/00 10/20 00/00 00/00 Choteau Ptcldy Ptcldy Rain Ptcldy Ptcldy Ptcldy Ptcldy /54 27/63 38/59 35/64 40/68 41/74 45/76 /30 10/20 00/70 60/10 10/20 00/00 00/00 Fort Benton Ptcldy Ptcldy Rain Ptcldy Ptcldy Sunny Ptcldy /55 28/66 42/65 39/67 41/71 43/78 47/81 /10 00/30 00/50 50/20 10/10 10/00 10/10 Stanford Ptcldy Ptcldy Rain Ptcldy Ptcldy Sunny Ptcldy /45 24/59 39/59 36/59 39/64 42/71 47/73 /20 00/30 00/60 70/30 10/20 10/10 00/10 White Sulphur Springs Ptcldy Ptcldy Ptcldy Ptcldy Ptcldy Ptcldy Ptcldy /47 22/56 34/59 34/59 35/64 37/71 41/74 /20 00/20 00/30 70/20 10/20 00/00 10/10 ...SOUTHWEST MONTANA... Bozeman Airport Ptcldy Ptcldy Ptcldy Ptcldy Ptcldy Sunny Ptcldy /51 22/60 34/64 34/61 35/68 38/75 42/78 /10 00/10 00/10 70/30 10/10 00/00 10/10 Bozeman MSU Mocldy Ptcldy Ptcldy Rain Ptcldy Sunny Ptcldy /46 24/5836/63 36/59 37/67 40/74 44/77 /20 10/10 00/20 80/50 10/10 10/00 10/10 West Yellowstone Ptcldy Ptcldy Ptcldy Ptcldy Ptcldy Ptcldy Sunny /41 16/51 24/58 28/57 28/63 30/70 33/73 /10 10/20 00/10 50/30 10/20 00/00 00/00 Dillon Sunny Ptcldy Ptcldy Ptcldy Ptcldy Sunny Sunny /48 23/60 30/63 34/63 36/68 38/75 41/78 /10 10/20 00/00 40/10 10/10 00/00 00/00 Boulder Ptcldy Ptcldy Ptcldy Ptcldy Ptcldy Sunny Sunny /50 26/58 33/61 36/62 38/66 40/73 43/75 /10 10/20 00/30 60/20 10/20 00/00 00/00 Townsend Sunny Ptcldy Ptcldy Ptcldy Ptcldy Sunny Ptcldy /52 29/61 39/63 39/63 41/68 44/75 46/78 /10 10/30 00/20 60/10 10/20 00/00 00/10 Virginia City Ptcldy Ptcldy Ptcldy Ptcldy Ptcldy Sunny Ptcldy /40 23/53 31/56 35/55 36/61 39/66 43/69 /20 00/20 00/10 70/40 10/10 10/00 00/10 $$ http://www.weather.gov/greatfalls