Merrillville Weather Forecast

    • 52
    • 64

    Cloudy

    • 52
    • 64

    Mostly Cloudy

    • 52
    • 65

    Mostly Cloudy

    • 52
    • 67

    Mostly Cloudy

    • 51
    • 68

    Partly Sunny

    • 53
    • 72

    Mostly Cloudy

Today 21 Sep Lake

Cloudy. A slight chance of Showers in the morning. Highs in the mid 60s. Northeast Winds 10 to 15 Mph. Chance of precipitation 20 percent.

Tonight 21 Sep Lake

Mostly cloudy. Lows in the lower 50s. Northeast Winds 10 to 15 Mph.

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Merrillville Temperature Statistics

September Temperature

Gary Regional Airport (9.3 miles)

  • Lowest 14 September, 2026

    51.8 °F

  • Average September

    73.9 °F

  • Highest 2 September, 2026

    98.6 °F

Climate (2021–2026)

Gary Regional Airport (9.3 miles)

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  • Average Low 2021–2026

    44 °F

  • Average 2021–2026

    51.8 °F

  • Average High 2021–2026

    61.4 °F
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