Johnston Lake Weather Forecast

    • 72
    • 94

    Chance Thunderstorms

    • 73
    • 92

    Chance Thunderstorms

    • 77
    • 94

    Mostly Sunny

    • 77
    • 96

    Hot

    • 78
    • 96

    Hot

    • 77
    • 95

    Slight Chance Thunderstorms

Today 6 Jul Gregg

Partly cloudy. A slight chance of Showers and Thunderstorms this Morning, then a chance of Showers and Thunderstorms this afternoon. Highs in the mid 90s. Southwest Winds around 5 Mph. Chance of rain 40 percent.

Tonight 6 Jul Gregg

Mostly cloudy with a chance of Showers with a slight chance of Thunderstorms in the Evening, then partly cloudy with a slight chance of Showers after midnight. Lows in the lower 70s. South Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Johnston Lake Temperature Statistics

July Temperature

Longview - East Texas Regional Airport (9.3 miles)

  • Lowest 3 July, 2026

    73.9 °F

  • Average July

    84.4 °F

  • Highest 1 July, 2026

    95.6 °F

Climate (2021–2026)

Longview - East Texas Regional Airport (9.3 miles)

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  • Average Low 2021–2026

    57.6 °F

  • Average 2021–2026

    68 °F

  • Average High 2021–2026

    79.4 °F
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