Fairfield Weather Forecast

    • 43
    • 71

    Mostly Sunny

    • 40
    • 71

    Partly Sunny

    • 32
    • 49

    Rain

    • 29
    • 47

    Slight Chance Snow

    • 26
    • 40

    Mostly Cloudy

    • 28
    • 43

    Mostly Cloudy

Today 21 Oct Eastern Pondera and Eastern Teton

Warmer, sunny. Highs in the lower 70s. South Winds up to 10 Mph.

Tonight 21 Oct Eastern Pondera and Eastern Teton

Mostly clear. Lows in the lower 40s. Southwest Winds up to 10 Mph.

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Fairfield Temperature Statistics

October Temperature

Great Falls, Great Falls International Airport (29.2 miles)

  • Lowest 12 October, 2026

    29.6 °F

  • Average October

    52.2 °F

  • Highest 5 October, 2026

    85.6 °F

Climate (2021–2026)

Great Falls, Great Falls International Airport (29.2 miles)

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  • Average Low 2021–2026

    34.4 °F

  • Average 2021–2026

    47 °F

  • Average High 2021–2026

    59.1 °F
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