McCartney Lake Weather Forecast

    • 72
    • 91

    Chance Thunderstorms

    • 67
    • 89

    Chance Thunderstorms

    • 59
    • 78

    Chance Rain Showers

    • 56
    • 77

    Mostly Sunny

    • 55
    • 77

    Mostly Sunny

    • 56
    • 77

    Partly Sunny

Today 28 Jul Grant

Mostly sunny. Hot with Highs in the lower 90s. North Winds 5 to 10 Mph, becoming northwest this afternoon. Heat index Values up to 100 this afternoon.

Tonight 28 Jul Grant

Mostly clear with a chance of Showers with a slight chance of Thunderstorms in the Evening, then mostly cloudy with a chance of Showers and Thunderstorms after midnight. Humid with Lows around 70. South Winds around 5 Mph, becoming north after midnight. Chance of rain 50 percent. Heat index Values up to 100 early in the evening.

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McCartney Lake Temperature Statistics

July Temperature

Dubuque Regional Airport (21.1 miles)

  • Lowest 13 July, 2025

    59.6 °F

  • Average July

    74.7 °F

  • Highest 4 July, 2025

    91.7 °F

Climate (2020–Present)

Dubuque Regional Airport (21.1 miles)

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  • Average Low 2020–2025

    40.3 °F

  • Average 2020–2025

    49.6 °F

  • Average High 2020–2025

    58.9 °F
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