Mercedes Weather Forecast

    • 74
    • 94

    Slight Chance Thunderstorms

    • 73
    • 93

    Rain Showers Likely

    • 74
    • 92

    Chance Thunderstorms

    • 74
    • 93

    Rain Showers Likely

    • 75
    • 93

    Rain Showers Likely

    • 74
    • 92

    Chance Thunderstorms

Today 14 Sep Southern Hidalgo

Mostly sunny. A slight chance of Showers and Thunderstorms this afternoon. Highs in the mid 90s. Southeast Winds 10 to 15 Mph. Chance of rain 20 percent.

Tonight 14 Sep Southern Hidalgo

Partly cloudy. Lows in the mid 70s. East Winds 5 to 10 Mph.

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Mercedes Temperature Statistics

September Temperature

Harlingen, Rio Grande Valley International Airport (16.8 miles)

  • Lowest 3 September, 2025

    73.9 °F

  • Average September

    83.4 °F

  • Highest 4 September, 2025

    100 °F

Climate (2020–Present)

Harlingen, Rio Grande Valley International Airport (16.8 miles)

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  • Average Low 2020–2025

    65.4 °F

  • Average 2020–2025

    75.2 °F

  • Average High 2020–2025

    86.1 °F
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