Mason Lake Weather Forecast

    • 71
    • 93

    Mostly Sunny

    • 72
    • 94

    Mostly Sunny

    • 69
    • 93

    Mostly Sunny

    • 71
    • 93

    Partly Sunny

    • 70
    • 92

    Partly Sunny

    • 68
    • 91

    Chance Thunderstorms

    • 66
    • 88

    Chance Rain Showers

Today 16 Sep Overton

Sunny. Near steady temperature in the lower 90s. North Winds around 5 Mph.

Tonight 16 Sep Overton

Mostly clear. Lows in the lower 70s. Southeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mason Lake Temperature Statistics

September Temperature

Sparta Upper Cumberland Regional Airport (17.4 miles)

  • Lowest 1 September, 2026

    66.2 °F

  • Average September

    78.9 °F

  • Highest 3 September, 2026

    98.6 °F

Climate (2021–2026)

Sparta Upper Cumberland Regional Airport (17.4 miles)

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  • Average Low 2021–2026

    47.5 °F

  • Average 2021–2026

    59.8 °F

  • Average High 2021–2026

    70.6 °F
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