Sinclair Weather Forecast

    • 41
    • 70

    Rain Showers Likely

    • 40
    • 57

    Mostly Cloudy

    • 40
    • 59

    Partly Sunny

    • 36
    • 58

    Partly Sunny

    • 37
    • 59

    Mostly Sunny

    • 44
    • 65

    Mostly Sunny

Today 27 Apr Grundy

A chance of Thunderstorms. Showers. Highs around 70. Southeast Winds 15 to 20 Mph, becoming south this afternoon. Chance of rain near 100 percent.

Tonight 27 Apr Grundy

Mostly cloudy. A slight chance of Showers and Thunderstorms in the evening. Breezy with Lows in the lower 40s. West Winds 20 to 25 Mph with Gusts up to 35 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sinclair Temperature Statistics

April Temperature

Waterloo, Waterloo Municipal Airport (16.8 miles)

  • Lowest 7 April, 2026

    23.6 °F

  • Average April

    50.2 °F

  • Highest 17 April, 2026

    82.7 °F

Climate (2021–Present)

Waterloo, Waterloo Municipal Airport (16.8 miles)

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  • Average Low 2021–2026

    40.2 °F

  • Average 2021–2026

    51.1 °F

  • Average High 2021–2026

    61.9 °F
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