Sinclair Weather Forecast

    • 62
    • 81

    Decreasing Clouds

    • 59
    • 78

    Partly Sunny

    • 57
    • 81

    Chance Thunderstorms

    • 51
    • 72

    Sunny

    • 47
    • 67

    Mostly Sunny

    • 46
    • 67

    Mostly Sunny

Today 20 Aug Grundy

Patchy fog in the morning. Mostly sunny. Humid with Highs in the lower 80s. North Winds 5 to 10 Mph.

Tonight 20 Aug Grundy

Mostly clear in the Evening, then becoming partly cloudy. Humid with Lows in the lower 60s. East Winds 5 to 10 Mph.

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Sinclair Temperature Statistics

August Temperature

Waterloo, Waterloo Municipal Airport (16.8 miles)

  • Lowest 1 August, 2025

    53.7 °F

  • Average August

    73.4 °F

  • Highest 16 August, 2025

    91.9 °F

Climate (2020–Present)

Waterloo, Waterloo Municipal Airport (16.8 miles)

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  • Average Low 2020–2025

    40 °F

  • Average 2020–2025

    50.9 °F

  • Average High 2020–2025

    61.5 °F
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