Mercedes Weather Forecast

    • 77
    • 99

    Hot

    • 77
    • 100

    Hot

    • 79
    • 100

    Hot

    • 78
    • 101

    Hot

    • 79
    • 101

    Hot

    • 79
    • 99

    Hot

Today 30 Jul Southern Hidalgo

Mostly sunny. Hot with Highs around 100. Southeast Winds 5 to 10 Mph. Heat index Values up to 107 this afternoon.

Tonight 30 Jul Southern Hidalgo

Partly cloudy. Lows in the upper 70s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph. Heat index Values up to 106 early in the evening.

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Mercedes Temperature Statistics

July Temperature

Harlingen, Rio Grande Valley International Airport (16.8 miles)

  • Lowest 17 July, 2025

    71.7 °F

  • Average July

    85.8 °F

  • Highest 24 July, 2025

    100.7 °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 °F
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