Summit Lake State Park Weather Forecast

    • 68
    • 89

    Thunderstorms

    • 59
    • 76

    Rain Showers

    • 62
    • 77

    Mostly Cloudy

    • 65
    • 83

    Chance Thunderstorms

    • 64
    • 82

    Slight Chance Thunderstorms

    • 68
    • 84

    Slight Chance Thunderstorms

    • 63
    • 86

    Chance Rain Showers

Today 9 Sep Henry

Mostly sunny Early, then becoming partly cloudy. Isolated Showers and Thunderstorms Early, then scattered Showers and Thunderstorms late. Highs in the upper 80s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 50 percent.

Tonight 9 Sep Henry

Mostly cloudy with scattered Showers and Thunderstorms. Patchy fog. Humid with Lows in the upper 60s. West Winds 5 to 10 Mph. Gusts up to 20 Mph late this afternoon. Chance of rain 50 percent.

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Summit Lake State Park Temperature Statistics

September Temperature

Muncie, Delaware County-Johnson Field (14.9 miles)

  • Lowest 7 September, 2026

    57 °F

  • Average September

    79.6 °F

  • Highest 3 September, 2026

    95.6 °F

Climate (2021–2026)

Muncie, Delaware County-Johnson Field (14.9 miles)

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  • Average Low 2021–2026

    45.7 °F

  • Average 2021–2026

    55.3 °F

  • Average High 2021–2026

    65 °F
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