Rattlesnake Lake Weather Forecast

    • 75
    • 101

    Hot

    • 75
    • 98

    Hot

    • 75
    • 98

    Hot

    • 74
    • 99

    Hot

    • 74
    • 97

    Hot

    • 73
    • 96

    Slight Chance Thunderstorms

Today 12 Sep Hays

Partly cloudy this Morning, then clearing. Hot with Highs around 101. South Winds 5 to 10 Mph with Gusts up to 20 Mph. Highest heat index Readings up to 109.

Tonight 12 Sep Hays

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 70s. South Winds 5 to 10 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rattlesnake Lake Temperature Statistics

September Temperature

San Marcos, San Marcos Municipal Airport (16.2 miles)

  • Lowest 8 September, 2026

    72 °F

  • Average September

    86.1 °F

  • Highest 2 September, 2026

    102.9 °F

Climate (2021–2026)

San Marcos, San Marcos Municipal Airport (16.2 miles)

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  • Average Low 2021–2026

    60.1 °F

  • Average 2021–2026

    71 °F

  • Average High 2021–2026

    82.6 °F
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