Lamar Weather Forecast

    • 27
    • 45

    Increasing Clouds

    • 36
    • 55

    Mostly Cloudy

    • 50
    • 60

    Mostly Cloudy

    • 30
    • 65

    Mostly Sunny

    • 37
    • 52

    Mostly Sunny

    • 47
    • 66

    Mostly Cloudy

Today 15 Dec Southern Johnson County

Sunny. Highs in the mid 40s. Southeast Winds around 5 Mph, becoming south this afternoon.

Tonight 15 Dec Southern Johnson County

Mostly clear in the Evening, then becoming partly cloudy. Cold with Lows in the upper 20s. Light and variable Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lamar Temperature Statistics

December Temperature

Russelville Municipal Airport (20.5 miles)

  • Lowest 9 December, 2025

    27 °F

  • Average December

    38.2 °F

  • Highest 12 December, 2025

    66.2 °F

Climate (2020–Present)

Russelville Municipal Airport (20.5 miles)

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  • Average Low 2020–2025

    51.6 °F

  • Average 2020–2025

    62.7 °F

  • Average High 2020–2025

    74.3 °F
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