Lewis Lake Weather Forecast

    • 41
    • 77

    Chance Rain Showers

    • 41
    • 72

    Slight Chance Thunderstorms

    • 39
    • 73

    Slight Chance Thunderstorms

    • 41
    • 75

    Slight Chance Thunderstorms

    • 40
    • 76

    Mostly Sunny

    • 40
    • 77

    Mostly Sunny

    • 42
    • 77

    Mostly Sunny

Today 21 Jul Yellowstone National Park

Partly cloudy with a slight chance of dry Thunderstorms. Breezy with Highs in the mid 70s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 21 Jul Yellowstone National Park

Partly cloudy. A slight chance of Showers and dry Thunderstorms this Evening, then a chance of Showers after midnight. Lows in the mid 40s. Southwest Winds 10 to 15 Mph. Gusts up to 30 Mph this evening. Chance of rain 30 percent.

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Lewis Lake Temperature Statistics

July Temperature

Yellowstone Lake (19.3 miles)

  • Lowest 6 July, 2025

    31.7 °F

  • Average July

    57.8 °F

  • Highest 1 July, 2025

    82.7 °F

Climate (2020–Present)

Yellowstone Lake (19.3 miles)

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  • Average Low 2020–2025

    22.3 °F

  • Average 2020–2025

    35.2 °F

  • Average High 2020–2025

    48 °F
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