Winchester Lake Weather Forecast

    • 56
    • 76

    Slight Chance Thunderstorms

    • 56
    • 80

    Mostly Sunny

    • 57
    • 82

    Mostly Sunny

    • 54
    • 80

    Sunny

    • 54
    • 81

    Sunny

    • 57
    • 85

    Mostly Sunny

Today 17 Aug Lewis and Southern Nez Perce Counties

Mostly cloudy in the morning then clearing. A chance of rain Showers. A chance of Thunderstorms in the afternoon. Highs in the mid 70s to mid 80s. Chance of precipitation 20 percent.

Tonight 17 Aug Lewis and Southern Nez Perce Counties

Partly cloudy. Lows in the mid 50s to lower 60s.

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Winchester Lake Temperature Statistics

August Temperature

Grangeville - Idaho County Airport (30.4 miles)

  • Lowest 5 August, 2025

    46.4 °F

  • Average August

    67.7 °F

  • Highest 12 August, 2025

    93.2 °F

Climate (2020–Present)

Grangeville - Idaho County Airport (30.4 miles)

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  • Average Low 2020–2025

    36.5 °F

  • Average 2020–2025

    47 °F

  • Average High 2020–2025

    57.6 °F
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