Griffith-Merrillville Airport Weather Forecast

    • 50
    • 67

    Decreasing Clouds

    • 50
    • 69

    Mostly Sunny

    • 52
    • 69

    Partly Sunny

    • 53
    • 71

    Mostly Sunny

    • 59
    • 72

    Rain Showers Likely

    • 59
    • 72

    Chance Rain Showers

Today 25 Sep Lake

Mostly cloudy. Isolated Sprinkles late in the morning. Highs in the upper 60s. Northeast Winds around 5 Mph.

Tonight 25 Sep Lake

Partly cloudy in the Evening, then clearing. Lows around 50. Northeast Winds around 5 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Griffith-Merrillville Airport Temperature Statistics

September Temperature

Gary Regional Airport (6.2 miles)

  • Lowest 14 September, 2026

    51.8 °F

  • Average September

    71.6 °F

  • Highest 2 September, 2026

    98.6 °F

Climate (2021–2026)

Gary Regional Airport (6.2 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    44 °F

  • Average 2021–2026

    51.8 °F

  • Average High 2021–2026

    61.4 °F
Get WillyWeather+ to remove ads