Johnson Lake Weather Forecast

    • 49
    • 71

    Slight Chance Thunderstorms

    • 52
    • 72

    Mostly Sunny

    • 44
    • 77

    Mostly Sunny

    • 38
    • 62

    Sunny

    • 39
    • 60

    Sunny

    • 44
    • 66

    Mostly Sunny

Today 30 Jul Butte/Blackfoot Region

Mostly sunny. Patchy smoke through the day. A 20 percent chance of Showers and Thunderstorms with little or no precipitation in the afternoon. Some Thunderstorms may produce gusty Winds. Highs in the 80s.

Tonight 30 Jul Butte/Blackfoot Region

Mostly cloudy. Patchy smoke through the night. A 20 percent chance of Showers and Thunderstorms with little or no precipitation in the evening. Some Thunderstorms may produce gusty Winds. Lows in the upper 40s to mid 50s.

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Johnson Lake Temperature Statistics

July Temperature

Butte, Bert Mooney Airport (47.2 miles)

  • Lowest 2 July, 2026

    40.6 °F

  • Average July

    68 °F

  • Highest 11 July, 2026

    95.6 °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

    42.2 °F

  • Average High 2021–2026

    55.6 °F
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