Merrillville Weather Forecast

    • 65
    • 85

    Increasing Clouds

    • 65
    • 82

    Rain Showers

    • 62
    • 78

    Rain Showers Likely

    • 63
    • 81

    Partly Sunny

    • 67
    • 84

    Slight Chance Thunderstorms

    • 69
    • 85

    Partly Sunny

Today 4 Aug Lake

Mostly sunny in the Morning, then becoming partly cloudy. Highs in the lower 80s. South Winds around 5 Mph.

Tonight 4 Aug Lake

Mostly clear. Patchy fog late. Lows in the lower 60s. South Winds around 5 Mph.

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Merrillville Temperature Statistics

August Temperature

Gary Regional Airport (9.3 miles)

  • Lowest 1 August, 2026

    68 °F

  • Average August

    70.7 °F

  • Highest 1 August, 2026

    73.4 °F

Climate (2021–2026)

Gary Regional Airport (9.3 miles)

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  • Average Low 2021–2026

    43.9 °F

  • Average 2021–2026

    51.7 °F

  • Average High 2021–2026

    61.4 °F
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