Mercedes Weather Forecast

    • 75
    • 92

    Chance Rain Showers

    • 74
    • 89

    Chance Rain Showers

    • 75
    • 94

    Mostly Cloudy

    • 71
    • 89

    Mostly Cloudy

    • 71
    • 90

    Mostly Cloudy

    • 72
    • 91

    Partly Sunny

Today 8 May Southern Hidalgo

Patchy fog in the morning. Mostly cloudy with a chance of Showers and Thunderstorms in the Morning, then partly sunny in the afternoon. Humid with Highs around 90. Southeast Winds 5 to 10 Mph. Gusts up to 20 Mph in the afternoon. Chance of rain 50 percent.

Tonight 8 May Southern Hidalgo

Mostly cloudy with a chance of Showers and Thunderstorms. Patchy fog. Near steady temperature in the mid 70s. North Winds 5 to 10 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mercedes Temperature Statistics

May Temperature

Harlingen, Rio Grande Valley International Airport (16.8 miles)

  • Lowest 3 May, 2026

    56.6 °F

  • Average May

    74.2 °F

  • Highest 1 May, 2026

    91.7 °F

Climate (2021–Present)

Harlingen, Rio Grande Valley International Airport (16.8 miles)

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  • Average Low 2021–2026

    65.7 °F

  • Average 2021–2026

    75.7 °F

  • Average High 2021–2026

    86.5 °F
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