Grothaus Lake Weather Forecast

    • 40
    • 74

    Rain Showers

    • 25
    • 45

    Rain Showers

    • 16
    • 36

    Mostly Sunny

    • 19
    • 42

    Sunny

    • 36
    • 51

    Partly Sunny

    • 29
    • 58

    Mostly Sunny

Today 23 Jan Bexar

Cloudy. Patchy dense fog early. A slight chance of Showers Early, then a chance of Showers with a slight chance of Thunderstorms. Highs in the lower 70s. Southeast Winds around 10 Mph. Chance of rain 50 percent.

Tonight 23 Jan Bexar

Patchy fog in the evening. Showers. A chance of Thunderstorms, mainly in the evening. Much cooler with Lows around 40. East Winds 5 to 10 Mph, becoming northeast 10 to 15 Mph after midnight. Chance of rain near 100 percent.

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Grothaus Lake Temperature Statistics

January Temperature

Castroville Municipal Airport (9.3 miles)

  • Lowest 18 January, 2026

    24.8 °F

  • Average January

    56.9 °F

  • Highest 2 January, 2026

    87.8 °F

Climate (2021–Present)

Castroville Municipal Airport (9.3 miles)

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  • Average Low 2021–2026

    61.4 °F

  • Average 2021–2026

    72.2 °F

  • Average High 2021–2026

    84.1 °F
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