McCartney Lake Weather Forecast

    • 69
    • 90

    Chance Rain Showers

    • 65
    • 87

    Slight Chance Thunderstorms

    • 63
    • 83

    Slight Chance Thunderstorms

    • 65
    • 81

    Mostly Cloudy

    • 70
    • 86

    Chance Rain Showers

    • 65
    • 86

    Chance Rain Showers

Today 4 Sep Grant

Mostly sunny. A chance of Showers and Thunderstorms in the morning. Humid with Highs in the upper 80s. South Winds 5 to 10 Mph, becoming southwest in the afternoon. Chance of rain 40 percent. Heat index Values up to 100 in the afternoon.

Tonight 4 Sep Grant

A chance of Thunderstorms in the evening. Partly cloudy with a chance of Showers. Humid with Lows in the upper 60s. Southwest Winds around 5 Mph, becoming northeast after midnight. Chance of rain 40 percent. Heat index Values up to 100 early in the evening.

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McCartney Lake Temperature Statistics

September Temperature

Dubuque Regional Airport (21.1 miles)

  • Lowest 1 September, 2026

    70 °F

  • Average September

    79.1 °F

  • Highest 1 September, 2026

    90 °F

Climate (2021–2026)

Dubuque Regional Airport (21.1 miles)

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  • Average Low 2021–2026

    40.6 °F

  • Average 2021–2026

    50.1 °F

  • Average High 2021–2026

    59.4 °F
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