Merrillville Weather Forecast

    • 49
    • 72

    Decreasing Clouds

    • 33
    • 57

    Mostly Cloudy

    • 30
    • 42

    Partly Sunny

    • 37
    • 54

    Mostly Cloudy

    • 42
    • 50

    Mostly Cloudy

    • 32
    • 67

    Chance Rain Showers

Today 21 Mar Lake

Partly cloudy in the Morning, then clearing. Highs in the lower 70s. Southeast Winds 5 to 10 Mph, increasing to southwest 10 to 15 Mph in the afternoon.

Tonight 21 Mar Lake

Mostly clear in the Evening, then becoming partly cloudy. Lows around 50. Southwest Winds around 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Merrillville Temperature Statistics

March Temperature

Gary Regional Airport (9.3 miles)

  • Lowest 16 March, 2026

    21.2 °F

  • Average March

    42.1 °F

  • Highest 6 March, 2026

    78.8 °F

Climate (2021–Present)

Gary Regional Airport (9.3 miles)

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  • Average Low 2021–2026

    43.8 °F

  • Average 2021–2026

    51.6 °F

  • Average High 2021–2026

    61.1 °F
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