McCartney Lake Weather Forecast

    • 46
    • 60

    Mostly Cloudy

    • 51
    • 67

    Chance Rain Showers

    • 52
    • 74

    Slight Chance Thunderstorms

    • 54
    • 79

    Mostly Sunny

    • 58
    • 85

    Mostly Sunny

    • 60
    • 86

    Chance Rain Showers

Today 21 May Grant

Mostly cloudy. Highs in the lower 60s. East Winds 10 to 15 Mph.

Tonight 21 May Grant

Mostly cloudy. Lows in the mid 40s. East Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

McCartney Lake Temperature Statistics

May Temperature

Dubuque Regional Airport (21.1 miles)

  • Lowest 2 May, 2026

    32 °F

  • Average May

    57.4 °F

  • Highest 16 May, 2026

    82 °F

Climate (2021–Present)

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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