Seawillow Weather Forecast

    • 68
    • 94

    Slight Chance Thunderstorms

    • 68
    • 95

    Mostly Sunny

    • 68
    • 95

    Partly Sunny

    • 69
    • 95

    Slight Chance Thunderstorms

    • 69
    • 95

    Chance Rain Showers

    • 69
    • 95

    Slight Chance Thunderstorms

Today 15 Sep Caldwell

Mostly sunny this Morning, then becoming partly cloudy. Highs in the lower 90s. Southeast Winds 5 to 10 Mph.

Tonight 15 Sep Caldwell

Mostly clear. Lows in the upper 60s. Southeast Winds around 5 Mph, becoming southwest around 5 Mph after midnight.

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Seawillow Temperature Statistics

September Temperature

San Marcos, San Marcos Municipal Airport (16.2 miles)

  • Lowest 9 September, 2025

    61 °F

  • Average September

    81 °F

  • Highest 4 September, 2025

    102 °F

Climate (2020–Present)

San Marcos, San Marcos Municipal Airport (16.2 miles)

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  • Average Low 2020–2025

    59.2 °F

  • Average 2020–2025

    69.9 °F

  • Average High 2020–2025

    81.6 °F
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