Mercedes Weather Forecast

    • 56
    • 85

    Mostly Sunny

    • 58
    • 77

    Mostly Sunny

    • 65
    • 86

    Mostly Sunny

    • 65
    • 86

    Partly Sunny

    • 65
    • 83

    Partly Sunny

    • 64
    • 84

    Mostly Sunny

    • 64
    • 84

    Mostly Sunny

Today 18 Dec Southern Hidalgo

Sunny. Highs in the mid 80s. Southwest Winds 5 to 10 Mph.

Tonight 18 Dec Southern Hidalgo

Mostly clear. Lows in the mid 50s. Northeast Winds 5 to 10 Mph with Gusts up to 25 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Mercedes Temperature Statistics

December Temperature

Harlingen, Rio Grande Valley International Airport (16.8 miles)

  • Lowest 9 December, 2025

    43 °F

  • Average December

    61.8 °F

  • Highest 7 December, 2025

    86 °F

Climate (2020–Present)

Harlingen, Rio Grande Valley International Airport (16.8 miles)

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

  • Average Low 2020–2025

    65.5 °F

  • Average 2020–2025

    75.4 °F

  • Average High 2020–2025

    86.2 °F
Get WillyWeather+ to remove ads