Merrillville Weather Forecast

    • 34
    • 42

    Rain

    • 13
    • 50

    Rain

    • 21
    • 26

    Mostly Cloudy

    • 20
    • 44

    Mostly Cloudy

    • 21
    • 32

    Partly Sunny

    • 33
    • 39

    Mostly Cloudy

    • 30
    • 45

    Mostly Cloudy

Today 17 Dec Lake

Partly cloudy. Highs in the lower 40s. West Winds 5 to 10 Mph, becoming southeast in the afternoon.

Tonight 17 Dec Lake

Partly cloudy in the Evening, then becoming cloudy. Drizzle likely late. Breezy with Lows in the mid 30s. Temperature rising into the lower 40s after midnight. South Winds 10 to 15 Mph, increasing to 15 to 20 Mph after midnight. Gusts up to 30 Mph.

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Merrillville Temperature Statistics

December Temperature

Gary Regional Airport (9.3 miles)

  • Lowest 14 December, 2025

    1.4 °F

  • Average December

    23 °F

  • Highest 10 December, 2025

    41 °F

Climate (2020–Present)

Gary Regional Airport (9.3 miles)

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  • Average Low 2020–2025

    43.7 °F

  • Average 2020–2025

    51.5 °F

  • Average High 2020–2025

    60.9 °F
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