Winona State Forest Weather Forecast

    • 54
    • 69

    Mostly Cloudy

    • 51
    • 72

    Mostly Sunny

    • 51
    • 73

    Mostly Sunny

    • 53
    • 75

    Mostly Sunny

    • 56
    • 77

    Partly Sunny

    • 55
    • 77

    Partly Sunny

Today 13 Sep Oswego

Some patchy fog in the Morning, otherwise partly sunny. Highs Ranging from the upper 60s on the tug hill to the mid 70s across the lower Elevations. Light Winds.

Tonight 13 Sep Oswego

Partly to mostly cloudy with some patchy fog. Lows Ranging from the upper 40s on the tug hill to the lower 50s across the lower Elevations. Light southeast Winds.

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Winona State Forest Temperature Statistics

September Temperature

Watertown, Watertown International Airport (20.5 miles)

  • Lowest 9 September, 2025

    39.9 °F

  • Average September

    61.4 °F

  • Highest 4 September, 2025

    80.1 °F

Climate (2020–Present)

Watertown, Watertown International Airport (20.5 miles)

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  • Average Low 2020–2025

    38.9 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    57.7 °F
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