Joliet Weather Forecast

    • 77
    • 101

    Hot

    • 76
    • 102

    Hot

    • 77
    • 102

    Hot

    • 78
    • 102

    Hot

    • 78
    • 102

    Hot

    • 77
    • 103

    Hot

Today 18 Aug Caldwell

Partly cloudy. Hot with Highs around 101. South Winds 5 to 10 Mph.

Tonight 18 Aug Caldwell

Mostly clear in the Evening, then becoming partly cloudy. Lows in the upper 70s. South Winds 5 to 10 Mph.

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Joliet Temperature Statistics

August Temperature

San Marcos, San Marcos Municipal Airport (13.7 miles)

  • Lowest 3 August, 2026

    70 °F

  • Average August

    86.3 °F

  • Highest 13 August, 2026

    100.9 °F

Climate (2021–2026)

San Marcos, San Marcos Municipal Airport (13.7 miles)

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  • Average Low 2021–2026

    60.1 °F

  • Average 2021–2026

    70.9 °F

  • Average High 2021–2026

    82.5 °F
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