Stewart Lake Weather Forecast

    • 48
    • 60

    Mostly Sunny

    • 44
    • 65

    Chance Rain

    • 39
    • 56

    Chance Rain

    • 36
    • 50

    Rain/Snow Likely

    • 33
    • 39

    Chance Rain/Snow

    • 35
    • 47

    Mostly Sunny

Today 9 Sep Butte/Blackfoot Region

Mostly sunny. Areas of fog early in the morning. Highs in the mid 60s to lower 70s. West Winds to 15 Mph in the afternoon.

Tonight 9 Sep Butte/Blackfoot Region

Mostly clear. Lows in the 40s. West Winds to 15 Mph shifting to the south 15 to 20 Mph after midnight.

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Stewart Lake Temperature Statistics

September Temperature

Butte, Bert Mooney Airport (44.7 miles)

  • Lowest 3 September, 2026

    41.6 °F

  • Average September

    58.2 °F

  • Highest 1 September, 2026

    79.6 °F

Climate (2021–2026)

Butte, Bert Mooney Airport (44.7 miles)

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  • Average Low 2021–2026

    28.5 °F

  • Average 2021–2026

    42.3 °F

  • Average High 2021–2026

    55.7 °F
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