Griffith-Merrillville Airport Weather Forecast

    • 61
    • 78

    Mostly Cloudy

    • 66
    • 82

    Partly Sunny

    • 68
    • 88

    Thunderstorms Likely

    • 64
    • 81

    Thunderstorms Likely

    • 62
    • 76

    Slight Chance Thunderstorms

    • 68
    • 83

    Slight Chance Thunderstorms

    • 73
    • 89

    Mostly Sunny

Today 15 Jun Lake

Partly Cloudy, then becoming mostly cloudy late. Highs in the lower 80s Inland, but only in the lower 70s near the lake. Northeast Winds 5 to 10 Mph.

Tonight 15 Jun Lake

Mostly cloudy through the early Overnight, then becoming partly cloudy. Lows in the lower 60s. Northeast Winds 5 to 10 Mph in the Evening, becoming light and variable.

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Griffith-Merrillville Airport Temperature Statistics

June Temperature

Gary Regional Airport (6.2 miles)

  • Lowest 1 June, 2025

    37.4 °F

  • Average June

    64.7 °F

  • Highest 11 June, 2025

    91.4 °F

Climate (2020–Present)

Gary Regional Airport (6.2 miles)

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  • Average Low 2020–2025

    43.5 °F

  • Average 2020–2025

    51.3 °F

  • Average High 2020–2025

    60.6 °F
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