San Juan Weather Forecast

    • 80
    • 101

    Hot

    • 79
    • 99

    Rain Showers Likely

    • 76
    • 95

    Rain Showers Likely

    • 75
    • 94

    Rain Showers

    • 75
    • 94

    Rain Showers Likely

    • 75
    • 95

    Chance Thunderstorms

Today 5 Sep Southern Hidalgo

Mostly sunny. Hot with Highs around 101. Southeast Winds 10 to 15 Mph. Heat index Values up to 108.

Tonight 5 Sep Southern Hidalgo

Mostly clear. Humid with Lows in the upper 70s. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Heat index Values up to 105 early in the evening.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

San Juan Temperature Statistics

September Temperature

McAllen, Miller International Airport (5 miles)

  • Lowest 3 September, 2025

    78.1 °F

  • Average September

    87.8 °F

  • Highest 3 September, 2025

    100.9 °F

Climate (2020–Present)

McAllen, Miller International Airport (5 miles)

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

  • Average Low 2020–2025

    67.4 °F

  • Average 2020–2025

    76.9 °F

  • Average High 2020–2025

    87.6 °F
Get WillyWeather+ to remove ads