Johnson Lake Weather Forecast

    • 69
    • 93

    Partly Sunny

    • 71
    • 93

    Mostly Cloudy

    • 73
    • 95

    Partly Sunny

    • 73
    • 95

    Partly Sunny

    • 74
    • 94

    Chance Rain Showers

    • 72
    • 91

    Chance Rain Showers

Today 25 Sep Washington

Partly sunny. A chance of Showers. Highs in the upper 80s. Chance of rain 50 percent.

Tonight 25 Sep Washington

Mostly clear this Evening, then becoming partly cloudy. Lows in the upper 60s. East Winds around 5 Mph this Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Johnson Lake Temperature Statistics

September Temperature

Brenham, Brenham Municipal Airport (6.2 miles)

  • Lowest 19 September, 2026

    68.2 °F

  • Average September

    83.8 °F

  • Highest 2 September, 2026

    100 °F

Climate (2021–2026)

Brenham, Brenham Municipal Airport (6.2 miles)

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  • Average Low 2021–2026

    61 °F

  • Average 2021–2026

    70.8 °F

  • Average High 2021–2026

    81.8 °F
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