Griffith-Merrillville Airport Weather Forecast

    • 25
    • 33

    Increasing Clouds

    • 37
    • 42

    Mostly Cloudy

    • 32
    • 48

    Mostly Cloudy

    • 44
    • 46

    Rain Likely

    • 44
    • 51

    Chance Rain

    • 36
    • 50

    Mostly Cloudy

    • 26
    • 46

    Slight Chance Rain

Today 21 Dec Lake

Sunny. Highs in the lower 30s. Northwest Winds 5 to 10 Mph, becoming southwest in the afternoon.

Tonight 21 Dec Lake

Partly cloudy early in the Evening, then becoming mostly cloudy. Near steady temperature in the upper 20s. South Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Griffith-Merrillville Airport Temperature Statistics

December Temperature

Gary Regional Airport (6.2 miles)

  • Lowest 14 December, 2025

    1.4 °F

  • Average December

    24.9 °F

  • Highest 18 December, 2025

    53.6 °F

Climate (2020–Present)

Gary Regional Airport (6.2 miles)

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  • Average Low 2020–2025

    43.7 °F

  • Average 2020–2025

    51.4 °F

  • Average High 2020–2025

    60.9 °F
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