Winchester Weather Forecast

    • 45
    • 61

    Becoming Sunny

    • 51
    • 73

    Sunny

    • 52
    • 78

    Sunny

    • 54
    • 79

    Mostly Sunny

    • 55
    • 79

    Partly Sunny

    • 54
    • 80

    Partly Sunny

Today 15 Sep Lewis and Southern Nez Perce Counties

Patchy fog in the morning. Mostly cloudy with a chance of rain Showers in the Morning, then partly cloudy in the afternoon. Highs in the lower 60s to lower 70s. Chance of precipitation 20 percent. Rainfall Amounts less than a tenth of an inch.

Tonight 15 Sep Lewis and Southern Nez Perce Counties

Mostly clear. Lows in the mid 40s to lower 50s.

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  • Temperature Real-Time

Winchester Temperature Statistics

September Temperature

Lewiston, Lewiston-Nez Perce County Airport (20.5 miles)

  • Lowest 13 September, 2025

    57 °F

  • Average September

    75.8 °F

  • Highest 2 September, 2025

    102 °F

Climate (2020–Present)

Lewiston, Lewiston-Nez Perce County Airport (20.5 miles)

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  • Average Low 2020–2025

    45.5 °F

  • Average 2020–2025

    55.5 °F

  • Average High 2020–2025

    65.9 °F
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