Rio Vista Weather Forecast

    • 73
    • 96

    Increasing Clouds

    • 72
    • 95

    Mostly Cloudy

    • 74
    • 97

    Hot

    • 74
    • 97

    Mostly Cloudy

    • 75
    • 96

    Chance Rain Showers

    • 72
    • 93

    Chance Thunderstorms

    • 70
    • 88

    Chance Rain Showers

Today 25 Sep Hays

Mostly cloudy in the Morning, then becoming partly cloudy. A chance of Showers. A slight chance of Thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 40 percent.

Tonight 25 Sep Hays

Partly cloudy. Lows in the lower 70s. Southeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rio Vista Temperature Statistics

September Temperature

San Marcos, San Marcos Municipal Airport (3.7 miles)

  • Lowest 20 September, 2026

    70 °F

  • Average September

    85.6 °F

  • Highest 2 September, 2026

    102.9 °F

Climate (2021–2026)

San Marcos, San Marcos Municipal Airport (3.7 miles)

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  • Average Low 2021–2026

    60.2 °F

  • Average 2021–2026

    71 °F

  • Average High 2021–2026

    82.6 °F
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