Merrillville Weather Forecast

    • 59
    • 78

    Increasing Clouds

    • 59
    • 73

    Rain Showers

    • 54
    • 67

    Slight Chance Rain Showers

    • 56
    • 71

    Chance Rain Showers

    • 57
    • 75

    Chance Thunderstorms

    • 57
    • 72

    Slight Chance Thunderstorms

Today 20 Jun Lake

Mostly sunny. Highs in the upper 70s. West Winds 5 to 10 Mph, increasing to northwest 10 to 15 Mph in the afternoon.

Tonight 20 Jun Lake

Partly cloudy. Lows in the upper 50s. Northwest Winds 5 to 10 Mph in the Evening, becoming light and variable.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Merrillville Temperature Statistics

June Temperature

Gary Regional Airport (9.3 miles)

  • Lowest 3 June, 2026

    50 °F

  • Average June

    69.8 °F

  • Highest 10 June, 2026

    93.2 °F

Climate (2021–2026)

Gary Regional Airport (9.3 miles)

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

  • Average Low 2021–2026

    43.8 °F

  • Average 2021–2026

    51.7 °F

  • Average High 2021–2026

    61.3 °F
Get WillyWeather+ to remove ads