South Bay Weather Forecast

    • 83
    • 90

    Chance Thunderstorms

    • 83
    • 89

    Rain Showers Likely

    • 82
    • 89

    Slight Chance Thunderstorms

    • 82
    • 89

    Mostly Sunny

    • 82
    • 89

    Slight Chance Thunderstorms

    • 82
    • 89

    Chance Rain Showers

Today 16 Sep Aransas Islands

A chance of Showers in the morning. Sunny. Highs around 90. Chance of rain 40 percent.

Tonight 16 Sep Aransas Islands

Partly cloudy with a slight chance of Showers this Evening, then mostly cloudy with a chance of Showers and Thunderstorms after midnight. Lows in the lower 80s. East Winds 10 to 15 Mph, Diminishing to 5 to 10 Mph after midnight. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Bay Temperature Statistics

September Temperature

Port Aransas, Mustang Beach Airport (5.6 miles)

  • Lowest 1 September, 2026

    82.2 °F

  • Average September

    86.6 °F

  • Highest 13 September, 2026

    91.6 °F

Climate (2021–2026)

Port Aransas, Mustang Beach Airport (5.6 miles)

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  • Average Low 2021–2026

    69.5 °F

  • Average 2021–2026

    73.9 °F

  • Average High 2021–2026

    78.7 °F
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