Riley Lake Weather Forecast

    • 77
    • 100

    Hot

    • 76
    • 101

    Hot

    • 75
    • 101

    Hot

    • 75
    • 99

    Hot

    • 74
    • 97

    Chance Thunderstorms

    • 72
    • 97

    Slight Chance Thunderstorms

Today 13 Sep Bexar

Partly cloudy in the Morning, then clearing. Highs in the upper 90s. Southeast Winds 10 to 15 Mph. Highest heat index Readings up to 106.

Tonight 13 Sep Bexar

Partly cloudy. Near steady temperature in the upper 70s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Riley Lake Temperature Statistics

September Temperature

San Antonio, Stinson Municipal Airport (6.2 miles)

  • Lowest 10 September, 2026

    75.9 °F

  • Average September

    89.6 °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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