O'Shaughnessy Reservoir Weather Forecast

    • 70
    • 90

    Rain Showers Likely

    • 61
    • 85

    Chance Thunderstorms

    • 58
    • 80

    Mostly Sunny

    • 61
    • 82

    Partly Sunny

    • 67
    • 84

    Partly Sunny

    • 71
    • 88

    Partly Sunny

Today 4 Sep Delaware

Partly cloudy with a chance of Showers and Thunderstorms. Highs in the upper 80s. South Winds around 5 Mph, becoming west this late morning and afternoon. Chance of rain 40 percent. Heat index Values up to 100 this afternoon.

Tonight 4 Sep Delaware

Partly cloudy. A chance of Showers and Thunderstorms in the Evening, then Showers likely with a chance of Thunderstorms after midnight. Muggy and Unseasonably warm. Lows around 70. West Winds around 5 Mph. Chance of rain 70 percent.

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O'Shaughnessy Reservoir Temperature Statistics

September Temperature

Delaware Municipal Airport (6.2 miles)

  • Lowest 1 September, 2026

    75.2 °F

  • Average September

    79.9 °F

  • Highest 1 September, 2026

    89.6 °F

Climate (2021–2026)

Delaware Municipal Airport (6.2 miles)

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  • Average Low 2021–2026

    43 °F

  • Average 2021–2026

    52.3 °F

  • Average High 2021–2026

    61.9 °F
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