Downtown (San Antonio) Weather Forecast

    • 78
    • 100

    Slight Chance Thunderstorms

    • 78
    • 100

    Hot

    • 77
    • 100

    Hot

    • 78
    • 98

    Hot

    • 76
    • 95

    Chance Thunderstorms

    • 75
    • 96

    Mostly Sunny

    • 75
    • 97

    Hot

Today 13 Sep Bexar

Mostly sunny. Highs in the upper 90s. Southeast Winds 10 to 15 Mph. Highest heat index Readings up to 108.

Tonight 13 Sep Bexar

Mostly clear with a slight chance of Showers this Evening, then partly cloudy after midnight. Lows in the mid 70s. Southeast Winds 10 to 15 Mph. Chance of rain 20 percent.

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Downtown (San Antonio) Temperature Statistics

September Temperature

San Antonio, Stinson Municipal Airport (6.2 miles)

  • Lowest 2 September, 2026

    76.6 °F

  • Average September

    89.9 °F

  • Highest 2 September, 2026

    103.6 °F

Climate (2021–2026)

San Antonio, Stinson Municipal Airport (6.2 miles)

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  • Average Low 2021–2026

    63 °F

  • Average 2021–2026

    73.9 °F

  • Average High 2021–2026

    85.4 °F
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