Sullivan Lake Weather Forecast

    • 55
    • 79

    Mostly Sunny

    • 56
    • 85

    Sunny

    • 59
    • 84

    Mostly Sunny

    • 57
    • 86

    Mostly Sunny

    • 55
    • 81

    Partly Sunny

    • 49
    • 74

    Mostly Sunny

Today 16 Sep Waterville Plateau

Sunny. Highs in the mid 70s to lower 80s. East wind 5 to 15 Mph in the afternoon.

Tonight 16 Sep Waterville Plateau

Mostly clear. Lows in the mid to upper 50s. Gusts up to 20 Mph in the evening.

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  • Temperature Real-Time

Sullivan Lake Temperature Statistics

September Temperature

Ephrata, Ephrata Municipal Airport (28.6 miles)

  • Lowest 12 September, 2025

    55.9 °F

  • Average September

    75.4 °F

  • Highest 2 September, 2025

    99 °F

Climate (2020–Present)

Ephrata, Ephrata Municipal Airport (28.6 miles)

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  • Average Low 2020–2025

    42.2 °F

  • Average 2020–2025

    53.4 °F

  • Average High 2020–2025

    63.7 °F
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