Mercedes Weather Forecast

    • 78
    • 100

    Hot

    • 77
    • 99

    Slight Chance Thunderstorms

    • 77
    • 97

    Rain Showers Likely

    • 78
    • 96

    Chance Thunderstorms

    • 78
    • 96

    Chance Thunderstorms

    • 77
    • 96

    Chance Rain Showers

    • 77
    • 97

    Chance Rain Showers

Today 20 Sep Southern Hidalgo

Mostly sunny. Hot. Near steady temperature in the upper 90s. East Winds 5 to 10 Mph with Gusts up to 20 Mph. Heat index Values up to 107.

Tonight 20 Sep Southern Hidalgo

Partly cloudy. Humid with Lows in the upper 70s. East Winds 10 to 15 Mph with Gusts up to 20 Mph, becoming southeast around 5 Mph after midnight. Heat index Values up to 105 early in the evening.

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Mercedes Temperature Statistics

September Temperature

Harlingen, Rio Grande Valley International Airport (16.8 miles)

  • Lowest 1 September, 2026

    74.6 °F

  • Average September

    89.8 °F

  • Highest 2 September, 2026

    104.6 °F

Climate (2021–2026)

Harlingen, Rio Grande Valley International Airport (16.8 miles)

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  • Average Low 2021–2026

    65.8 °F

  • Average 2021–2026

    76.1 °F

  • Average High 2021–2026

    86.9 °F
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