Montana weather by county

Montana in September 2026

• 36 of 56 counties ran at least 1° warmer than usual in September 2026, and 5 ran at least 1° cooler.
• Warmest against its own records: Carter County (5th-warmest September of 132). Coolest: Ravalli County (62nd-coldest).
• Wettest September against its records: Toole County, 3.9 inches (2nd-wettest).
• 21 of 56 counties were in moderate drought or worse on NOAA's Palmer reading for September.
• Since 1970 the state's counties have warmed about 0.5° per decade on average, Carbon County the most at 0.6°.

This week's forecast against the usual, and every month since 1895, for all 56 counties in Montana. 3 had a top-10 warm September in 2026.

• Beaverhead County 43rd warmest Sep
• Big Horn County 15th warmest Sep
• Blaine County 30th warmest Sep
• Broadwater County 32nd warmest Sep
• Carbon County 13th warmest Sep
• Carter County 5th warmest Sep
• Cascade County 27th warmest Sep
• Chouteau County 23rd warmest Sep
• Custer County 14th warmest Sep
• Daniels County 15th warmest Sep
• Dawson County 15th warmest Sep
• Deer Lodge County 47th warmest Sep
• Fallon County 9th warmest Sep
• Fergus County 28th warmest Sep
• Flathead County 38th warmest Sep
• Gallatin County 30th warmest Sep
• Garfield County 24th warmest Sep
• Glacier County 32nd warmest Sep
• Golden Valley County 32nd warmest Sep
• Granite County 57th warmest Sep
• Hill County 25th warmest Sep
• Jefferson County 41st warmest Sep
• Judith Basin County 34th warmest Sep
• Lake County 51st warmest Sep
• Lewis and Clark County 30th warmest Sep
• Liberty County 23rd warmest Sep
• Lincoln County 59th warmest Sep
• Madison County 42nd warmest Sep
• McCone County 14th warmest Sep
• Meagher County 30th warmest Sep
• Mineral County 62nd warmest Sep
• Missoula County 61st warmest Sep
• Musselshell County 22nd warmest Sep
• Park County 23rd warmest Sep
• Petroleum County 28th warmest Sep
• Phillips County 25th warmest Sep
• Pondera County 27th warmest Sep
• Powder River County 10th warmest Sep
• Powell County 41st warmest Sep
• Prairie County 14th warmest Sep
• Ravalli County 71st warmest Sep
• Richland County 15th warmest Sep
• Roosevelt County 15th warmest Sep
• Rosebud County 17th warmest Sep
• Sanders County 59th warmest Sep
• Sheridan County 16th warmest Sep
• Silver Bow County 37th warmest Sep
• Stillwater County 18th warmest Sep
• Sweet Grass County 24th warmest Sep
• Teton County 29th warmest Sep
• Toole County 25th warmest Sep
• Treasure County 16th warmest Sep
• Valley County 24th warmest Sep
• Wheatland County 36th warmest Sep
• Wibaux County 12th warmest Sep
• Yellowstone County 18th warmest Sep

Other states

• Alabama
• Alaska
• Arizona
• Arkansas
• California
• Colorado
• Connecticut
• Delaware
• Florida
• Georgia
• Hawaii
• Idaho
• Illinois
• Indiana
• Iowa
• Kansas
• Kentucky
• Louisiana
• Maine
• Maryland
• Massachusetts
• Michigan
• Minnesota
• Mississippi
• Missouri
• Nebraska
• Nevada
• New Hampshire
• New Jersey
• New Mexico
• New York
• North Carolina
• North Dakota
• Ohio
• Oklahoma
• Oregon
• Pennsylvania
• Rhode Island
• South Carolina
• South Dakota
• Tennessee
• Texas
• Utah
• Vermont
• Virginia
• Washington
• West Virginia
• Wisconsin
• Wyoming