Sullivan Lake Weather Forecast

    • 47
    • 68

    Increasing Clouds

    • 51
    • 70

    Rain Showers

    • 42
    • 61

    Rain Showers

    • 41
    • 58

    Partly Sunny

    • 41
    • 58

    Mostly Cloudy

    • 42
    • 59

    Partly Sunny

Today 23 Sep Waterville Plateau

Partly cloudy. Highs in the upper 60s to mid 70s.

Tonight 23 Sep Waterville Plateau

Partly cloudy. Lows in the mid 40s to lower 50s.

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Sullivan Lake Temperature Statistics

September Temperature

Ephrata, Ephrata Municipal Airport (28.6 miles)

  • Lowest 14 September, 2026

    42.7 °F

  • Average September

    64.1 °F

  • Highest 21 September, 2026

    84.9 °F

Climate (2021–2026)

Ephrata, Ephrata Municipal Airport (28.6 miles)

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  • Average Low 2021–2026

    42.2 °F

  • Average 2021–2026

    53.4 °F

  • Average High 2021–2026

    63.9 °F
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