Old Reservoir Weather Forecast

    • 75
    • 80

    Thunderstorms Likely

    • 77
    • 83

    Chance Thunderstorms

    • 76
    • 83

    Thunderstorms

    • 76
    • 81

    Thunderstorms Likely

    • 77
    • 82

    Chance Thunderstorms

    • 79
    • 83

    Chance Thunderstorms

Today 21 May Coastal Brazoria

Showers and Thunderstorms. Highs around 80. East Winds 5 to 10 Mph, becoming south in the afternoon. Chance of rain 80 percent.

Tonight 21 May Coastal Brazoria

Mostly cloudy with a chance of Showers and Thunderstorms. Near steady temperature in the mid 70s. East Winds 5 to 10 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Old Reservoir Temperature Statistics

May Temperature

Angleton / Lake Jackson, Brazoria County Airport (14.9 miles)

  • Lowest 3 May, 2026

    49.6 °F

  • Average May

    75.5 °F

  • Highest 9 May, 2026

    91.7 °F

Climate (2021–Present)

Angleton / Lake Jackson, Brazoria County Airport (14.9 miles)

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  • Average Low 2021–2026

    62.8 °F

  • Average 2021–2026

    72 °F

  • Average High 2021–2026

    81.8 °F
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