Carnegie Weather Forecast

    • 13
    • 32

    Decreasing Clouds

    • 22
    • 34

    Increasing Clouds

    • 27
    • 37

    Mostly Cloudy

    • 20
    • 36

    Chance Rain/Snow

    • 14
    • 28

    Mostly Cloudy

    • 28
    • 35

    Rain/Snow Likely

    • 26
    • 39

    Rain/Snow

Today 4 Dec Allegheny

Partly sunny with a chance of Flurries. Highs in the lower 30s. Temperatures falling into the mid 20s. Northwest Winds 10 to 15 Mph.

Tonight 4 Dec Allegheny

Mainly clear. Cold with Lows around 11. Northeast Winds around 5 Mph.

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Carnegie Temperature Statistics

December Temperature

Pittsburgh - Allegheny County Airport (9.3 miles)

  • Lowest 1 December, 2025

    28 °F

  • Average December

    29.9 °F

  • Highest 1 December, 2025

    32 °F

Climate (2020–Present)

Pittsburgh - Allegheny County Airport (9.3 miles)

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  • Average Low 2020–2025

    46.1 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    63.3 °F
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