Rio Vista Weather Forecast

    • 52
    • 71

    Increasing Clouds

    • 64
    • 75

    Mostly Cloudy

    • 62
    • 79

    Mostly Cloudy

    • 61
    • 79

    Mostly Cloudy

    • 62
    • 78

    Mostly Cloudy

    • 61
    • 81

    Partly Sunny

Today 21 Dec Hays

Mostly sunny this Morning, then becoming partly cloudy. Highs in the upper 60s. North Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 21 Dec Hays

Partly cloudy in the Evening, then becoming mostly cloudy. Lows around 50. North Winds around 5 Mph.

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Rio Vista Temperature Statistics

December Temperature

San Marcos, San Marcos Municipal Airport (3.7 miles)

  • Lowest 9 December, 2025

    28 °F

  • Average December

    53.3 °F

  • Highest 13 December, 2025

    80.1 °F

Climate (2020–Present)

San Marcos, San Marcos Municipal Airport (3.7 miles)

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  • Average Low 2020–2025

    59.5 °F

  • Average 2020–2025

    70.2 °F

  • Average High 2020–2025

    81.8 °F
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