Johnson Lake Weather Forecast

    • 76
    • 97

    Slight Chance Thunderstorms

    • 75
    • 96

    Slight Chance Thunderstorms

    • 75
    • 97

    Hot

    • 75
    • 95

    Partly Sunny

    • 73
    • 94

    Partly Sunny

    • 72
    • 94

    Mostly Sunny

Today 13 Sep Washington

Mostly sunny. A slight chance of Showers and Thunderstorms in the afternoon. Hot with Highs in the upper 90s. South Winds 5 to 10 Mph. Chance of rain 20 percent. Heat index Values up to 109.

Tonight 13 Sep Washington

Mostly clear. Lows in the mid 70s. South Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Johnson Lake Temperature Statistics

September Temperature

Brenham, Brenham Municipal Airport (6.2 miles)

  • Lowest 5 September, 2026

    74.3 °F

  • Average September

    83.4 °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

    60.9 °F

  • Average 2021–2026

    70.8 °F

  • Average High 2021–2026

    81.7 °F
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