Diamond Weather Forecast

    • 19
    • 43

    Becoming Sunny

    • 21
    • 32

    Partly Sunny

    • 37
    • 43

    Cloudy

    • 31
    • 47

    Mostly Cloudy

    • 48
    • 48

    Rain Likely

    • 41
    • 59

    Mostly Cloudy

    • 35
    • 51

    Mostly Cloudy

Today 20 Dec Grundy

Mostly cloudy. Breezy. Highs in the lower 40s. Southwest Winds 15 to 20 Mph, becoming west 10 to 15 Mph in the afternoon. Gusts up to 30 Mph.

Tonight 20 Dec Grundy

Clear. Lows around 19. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Diamond Temperature Statistics

December Temperature

Joliet Regional Airport (16.2 miles)

  • Lowest 5 December, 2025

    -1.1 °F

  • Average December

    24.6 °F

  • Highest 18 December, 2025

    51.8 °F

Climate (2020–Present)

Joliet Regional Airport (16.2 miles)

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  • Average Low 2020–2025

    43.5 °F

  • Average 2020–2025

    53.6 °F

  • Average High 2020–2025

    63 °F
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