Merrillville Weather Forecast

    • 55
    • 68

    Chance Rain Showers

    • 52
    • 64

    Cloudy

    • 52
    • 64

    Mostly Cloudy

    • 52
    • 65

    Mostly Cloudy

    • 52
    • 67

    Mostly Cloudy

    • 51
    • 68

    Partly Sunny

    • 53
    • 72

    Mostly Cloudy

Today 20 Sep Lake

Mostly cloudy. Highs in the mid 70s.

Tonight 20 Sep Lake

Cloudy. Areas of drizzle late in the Evening, then a chance of Showers after midnight. Lows in the mid 50s. Northeast Winds 10 to 15 Mph. Gusts up to 25 Mph late in the evening. Chance of precipitation 30 percent.

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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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