Big Arm Weather Forecast

    • 50
    • 64

    Rain Likely

    • 51
    • 64

    Rain Likely

    • 49
    • 65

    Rain Likely

    • 52
    • 67

    Rain Likely

    • 49
    • 62

    Rain Likely

    • 50
    • 66

    Slight Chance Rain

Today 3 Sep Flathead/Mission Valleys

Rain likely in the Morning, then slight chance of Showers and Thunderstorms in the afternoon. Chance of precipitation 70 percent. Highs in the 60s. Southwest Winds to 15 Mph.

Tonight 3 Sep Flathead/Mission Valleys

Slight chance of rain in the Evening, then rain likely after midnight. Patchy fog after midnight. Chance of rain 70 percent. Lows in the upper 30s to mid 40s.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Arm Temperature Statistics

September Temperature

Kalispell, Glacier Park International Airport (34.8 miles)

  • Lowest 1 September, 2026

    42.1 °F

  • Average September

    63.5 °F

  • Highest 1 September, 2026

    82.9 °F

Climate (2021–2026)

Kalispell, Glacier Park International Airport (34.8 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    45.4 °F

  • Average High 2021–2026

    57 °F
Get WillyWeather+ to remove ads