O'Leary's Lake Recreation Area Weather Forecast

    • 61
    • 84

    Mostly Cloudy

    • 58
    • 80

    Mostly Cloudy

    • 59
    • 79

    Slight Chance Thunderstorms

    • 56
    • 83

    Partly Sunny

    • 57
    • 84

    Mostly Sunny

    • 63
    • 86

    Partly Sunny

    • 65
    • 87

    Chance Thunderstorms

Today 29 May Grant

Mostly sunny. Highs in the lower 80s. Light Winds.

Tonight 29 May Grant

Mostly cloudy. Lows in the upper 50s. East Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

O'Leary's Lake Recreation Area Temperature Statistics

May Temperature

Dubuque Regional Airport (10.6 miles)

  • Lowest 2 May, 2026

    32 °F

  • Average May

    59.4 °F

  • Highest 27 May, 2026

    89.1 °F

Climate (2021–Present)

Dubuque Regional Airport (10.6 miles)

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  • Average Low 2021–2026

    40.6 °F

  • Average 2021–2026

    50.1 °F

  • Average High 2021–2026

    59.5 °F
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