Fairfield Weather Forecast

    • 50
    • 71

    Chance Rain Showers

    • 51
    • 69

    Rain Showers

    • 46
    • 63

    Rain Showers

    • 44
    • 67

    Slight Chance Rain Showers

    • 47
    • 72

    Partly Sunny

    • 49
    • 76

    Partly Sunny

Today 5 Sep Eastern Pondera and Eastern Teton

Mostly sunny. A 20 percent chance of rain Showers in the morning. Highs in the lower 70s. Northwest Winds up to 10 Mph shifting to the north in the afternoon.

Tonight 5 Sep Eastern Pondera and Eastern Teton

Mostly cloudy. Chance of rain Showers and slight chance of Thunderstorms in the Evening, then chance of rain Showers after midnight. Lows around 50. North Winds 5 to 10 Mph. Chance of precipitation 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Fairfield Temperature Statistics

September Temperature

Great Falls, Great Falls International Airport (29.2 miles)

  • Lowest 1 September, 2026

    46.7 °F

  • Average September

    66.1 °F

  • Highest 1 September, 2026

    86.6 °F

Climate (2021–2026)

Great Falls, Great Falls International Airport (29.2 miles)

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  • Average Low 2021–2026

    34.3 °F

  • Average 2021–2026

    46.9 °F

  • Average High 2021–2026

    59.1 °F
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