Johnson Lake Weather Forecast

    • 38
    • 57

    Becoming Sunny

    • 41
    • 61

    Rain

    • 38
    • 52

    Rain Showers

    • 37
    • 50

    Rain Showers Likely

    • 38
    • 56

    Mostly Sunny

    • 38
    • 56

    Mostly Sunny

Today 16 Sep Butte/Blackfoot Region

Partly cloudy in the morning then becoming mostly sunny. Areas of fog and patchy frost early in the morning. Highs in the mid 60s to lower 70s.

Tonight 16 Sep Butte/Blackfoot Region

Mostly clear. Lows in the mid 30s to lower 40s.

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Johnson Lake Temperature Statistics

September Temperature

Butte, Bert Mooney Airport (47.2 miles)

  • Lowest 9 September, 2026

    31.6 °F

  • Average September

    55.7 °F

  • Highest 1 September, 2026

    79.6 °F

Climate (2021–2026)

Butte, Bert Mooney Airport (47.2 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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