Georgetown Lake Weather Forecast

    • 35
    • 52

    Rain Likely

    • 38
    • 61

    Mostly Sunny

    • 41
    • 68

    Sunny

    • 42
    • 71

    Mostly Sunny

    • 43
    • 70

    Partly Sunny

    • 44
    • 70

    Slight Chance Rain

Today 15 Sep Butte/Blackfoot Region

Mostly cloudy. Chance of rain Showers in the Morning, then chance of rain Showers and a slight chance of Thunderstorms in the afternoon. Chance of precipitation 50 percent. Cooler. Highs in the mid 50s to lower 60s.

Tonight 15 Sep Butte/Blackfoot Region

Partly cloudy with a 20 percent chance of rain Showers. Patchy fog after midnight. Lows in the mid 30s to lower 40s.

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Georgetown Lake Temperature Statistics

September Temperature

Butte, Bert Mooney Airport (41 miles)

  • Lowest 12 September, 2025

    37 °F

  • Average September

    59.7 °F

  • Highest 3 September, 2025

    88 °F

Climate (2020–Present)

Butte, Bert Mooney Airport (41 miles)

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  • Average Low 2020–2025

    27.7 °F

  • Average 2020–2025

    41.7 °F

  • Average High 2020–2025

    55 °F
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