Johnston Lake Weather Forecast

    • 77
    • 106

    Chance Thunderstorms

    • 77
    • 103

    Hot

    • 79
    • 103

    Hot

    • 79
    • 102

    Hot

    • 80
    • 104

    Hot

    • 77
    • 103

    Slight Chance Thunderstorms

    • 76
    • 101

    Slight Chance Thunderstorms

Today 21 Aug Gregg

Mostly cloudy with a chance of Showers and Thunderstorms. Hot. Near steady temperature around 103. North Winds around 5 Mph. Chance of rain 40 percent.

Tonight 21 Aug Gregg

Mostly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then mostly clear after midnight. Lows in the mid 70s. South Winds around 5 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Johnston Lake Temperature Statistics

August Temperature

Longview - East Texas Regional Airport (9.3 miles)

  • Lowest 2 August, 2026

    68.6 °F

  • Average August

    88.8 °F

  • Highest 17 August, 2026

    106.6 °F

Climate (2021–2026)

Longview - East Texas Regional Airport (9.3 miles)

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  • Average Low 2021–2026

    57.7 °F

  • Average 2021–2026

    68.2 °F

  • Average High 2021–2026

    79.6 °F
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