McCartney Lake Weather Forecast

    • 65
    • 84

    Chance Rain Showers

    • 61
    • 77

    Rain Showers Likely

    • 61
    • 76

    Chance Rain Showers

    • 60
    • 75

    Chance Rain Showers

    • 61
    • 78

    Chance Rain Showers

    • 58
    • 76

    Slight Chance Thunderstorms

    • 56
    • 74

    Mostly Sunny

Today 18 Sep Grant

Partly sunny with a chance of Showers with a slight chance of Thunderstorms. Near steady temperature in the lower 80s. Light Winds. Chance of rain 50 percent.

Tonight 18 Sep Grant

Mostly cloudy. Scattered Showers with a slight chance of Thunderstorms this Evening, then a chance of Showers and Thunderstorms after midnight. Lows in the lower 60s. East Winds around 5 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

McCartney Lake Temperature Statistics

September Temperature

Dubuque Regional Airport (21.1 miles)

  • Lowest 7 September, 2025

    39.9 °F

  • Average September

    64.3 °F

  • Highest 14 September, 2025

    87.1 °F

Climate (2020–Present)

Dubuque Regional Airport (21.1 miles)

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  • Average Low 2020–2025

    40.3 °F

  • Average 2020–2025

    49.7 °F

  • Average High 2020–2025

    58.9 °F
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