FPUS65 KTFX 182136 SFTTFX MTZ301>330-191100- Tabular State Forecast for North Central and Southwest Montana National Weather Service Great Falls MT 336 PM 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 Tue Wed Thu Fri Sat Sun Mon May 19 May 20 May 21 May 22 May 23 May 24 May 25 ...CENTRAL MONTANA... Great Falls Ptcldy Rain Ptcldy Ptcldy Sunny Ptcldy Sunny 30/64 40/56 38/61 39/69 43/76 50/79 51/79 00/40 20/70 80/30 00/00 00/00 00/00 10/10 Cut Bank Ptcldy Rain Ptcldy Ptcldy Sunny Ptcldy Ptcldy 29/63 37/53 34/62 37/68 40/74 45/74 46/73 30/20 30/90 40/10 00/10 00/00 00/10 10/10 Havre Ptcldy Rain Ptcldy Ptcldy Sunny Ptcldy Sunny 28/68 40/60 36/65 36/72 42/78 47/81 49/83 00/40 60/50 30/10 00/00 00/00 10/00 10/10 Helena Ptcldy Ptcldy Rain Ptcldy Sunny Sunny Sunny 30/65 38/60 37/64 38/70 40/76 44/79 45/79 10/30 30/40 80/50 00/10 00/00 10/10 10/10 Lewistown Sunny Tstrms Rain Ptcldy Sunny Ptcldy Sunny 26/60 36/56 35/56 34/64 39/72 43/76 45/78 00/20 30/70 80/60 10/10 00/00 00/10 00/10 Shelby Ptcldy Rain Ptcldy Ptcldy Sunny Ptcldy Sunny 29/65 39/56 35/64 37/70 41/76 46/77 47/76 20/30 20/70 50/10 00/00 00/00 00/10 10/10 Chester Ptcldy Rain Ptcldy Ptcldy Sunny Ptcldy Sunny 28/65 37/57 35/64 36/70 40/77 44/79 46/79 10/40 30/70 40/10 00/00 00/00 00/00 10/10 Chinook Ptcldy Rain Ptcldy Sunny Sunny Ptcldy Sunny 28/68 39/61 37/65 37/71 42/79 46/82 48/84 00/20 20/50 20/10 00/10 00/00 10/00 10/10 Conrad Ptcldy Rain Ptcldy Ptcldy Sunny Ptcldy Sunny 29/65 38/56 35/63 37/70 41/76 46/78 47/77 20/30 30/80 60/10 00/00 00/00 00/00 10/10 Choteau Ptcldy Rain Ptcldy Ptcldy Sunny Ptcldy Sunny 28/64 37/55 34/63 37/69 41/75 46/78 47/76 20/20 30/90 70/20 00/00 00/00 00/00 10/20 Fort Benton Ptcldy Rain Ptcldy Ptcldy Sunny Ptcldy Sunny 30/68 41/59 39/65 39/72 42/79 48/83 50/82 00/30 30/70 70/20 00/00 00/00 00/10 00/20 Stanford Sunny Tstrms Rain Sunny Sunny Sunny Sunny 27/61 38/55 37/57 36/64 41/72 47/76 49/77 00/20 30/80 90/60 10/10 00/00 00/10 00/20 White Sulphur Springs Sunny Ptcldy Rnsnow Ptcldy Sunny Sunny Ptcldy 24/59 34/55 34/56 33/64 37/71 42/76 44/77 00/20 30/40 80/50 00/10 00/00 10/10 00/20 ...SOUTHWEST MONTANA... Bozeman Airport Sunny Ptcldy Rain Sunny Sunny Sunny Sunny 24/62 33/60 34/59 32/66 37/75 42/80 44/81 00/00 30/20 90/60 10/10 00/00 10/10 00/10 Bozeman MSU Sunny Ptcldy Rnsnow Ptcldy Sunny Sunny Sunny 25/60 36/5836/58 34/65 39/73 45/79 47/80 00/00 20/20 90/70 10/10 00/00 10/10 10/10 West Yellowstone Sunny Ptcldy Rnsnow Ptcldy Sunny Sunny Sunny 15/54 25/54 29/55 26/61 29/68 34/74 36/76 00/10 20/20 80/60 10/10 00/00 00/10 00/10 Dillon Sunny Ptcldy Ptcldy Sunny Sunny Sunny Sunny 25/61 33/61 34/60 33/66 37/74 42/79 44/79 00/10 20/10 70/30 00/00 00/00 10/00 00/10 Boulder Ptcldy Ptcldy Ptcldy Ptcldy Sunny Sunny Sunny 29/60 36/56 36/60 36/66 40/73 45/77 46/76 10/30 30/40 80/40 00/10 00/10 10/10 00/20 Townsend Ptcldy Ptcldy Ptcldy Sunny Sunny Sunny Sunny 31/63 40/59 39/63 39/68 43/75 47/79 48/80 00/20 30/30 80/40 00/00 00/00 10/10 00/10 Virginia City Sunny Ptcldy Rnsnow Ptcldy Sunny Sunny Sunny 23/54 34/54 35/52 34/60 38/67 44/71 47/72 00/10 20/10 90/60 10/10 00/00 10/10 00/10 $$ http://www.weather.gov/greatfalls