Lost Lake Weather Forecast

    • 55
    • 72

    Chance Rain

    • 54
    • 73

    Mostly Cloudy

    • 52
    • 72

    Mostly Sunny

    • 53
    • 76

    Mostly Sunny

    • 54
    • 75

    Mostly Sunny

    • 55
    • 80

    Partly Sunny

Today 13 Sep Island County

Cloudy with a chance of rain in the Morning, then mostly cloudy with a slight chance of rain early in the afternoon. Mostly sunny late in the afternoon. Highs in the 60s to lower 70s. South wind 10 to 15 Mph.

Tonight 13 Sep Island County

Mostly cloudy. Lows in the lower to mid 50s. South wind 10 to 20 Mph becoming southeast after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lost Lake Temperature Statistics

September Temperature

Arlington Municipal Airport (14.9 miles)

  • Lowest 8 September, 2026

    46 °F

  • Average September

    60.5 °F

  • Highest 9 September, 2026

    78.1 °F

Climate (2021–2026)

Arlington Municipal Airport (14.9 miles)

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  • Average Low 2021–2026

    42.6 °F

  • Average 2021–2026

    50.9 °F

  • Average High 2021–2026

    59.9 °F
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