Winchester Weather Forecast

    • 49
    • 68

    Mostly Sunny

    • 51
    • 73

    Sunny

    • 53
    • 75

    Mostly Sunny

    • 50
    • 72

    Mostly Sunny

    • 48
    • 69

    Mostly Sunny

    • 51
    • 75

    Partly Sunny

Today 19 Sep Lewis and Southern Nez Perce Counties

Partly cloudy in the Morning, becoming sunny. Highs in the upper 60s to upper 70s.

Tonight 19 Sep Lewis and Southern Nez Perce Counties

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

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Winchester Temperature Statistics

September Temperature

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

  • Lowest 5 September, 2026

    49.6 °F

  • Average September

    64.4 °F

  • Highest 10 September, 2026

    88.6 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    45.5 °F

  • Average 2021–2026

    55.5 °F

  • Average High 2021–2026

    65.9 °F
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