Johnston Lake Weather Forecast

    • 75
    • 89

    Partly Sunny

    • 69
    • 89

    Thunderstorms Likely

    • 67
    • 82

    Rain Showers

    • 67
    • 80

    Rain Showers

    • 67
    • 81

    Rain Showers

    • 67
    • 82

    Chance Thunderstorms

    • 67
    • 81

    Chance Thunderstorms

Today 18 May Gregg

Mostly cloudy and windy. Highs in the upper 80s. South Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 18 May Gregg

Partly cloudy with a chance of Showers with a slight chance of Thunderstorms in the Evening, then mostly cloudy after midnight. Lows in the mid 70s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Johnston Lake Temperature Statistics

May Temperature

Longview - East Texas Regional Airport (9.3 miles)

  • Lowest 2 May, 2026

    50.6 °F

  • Average May

    70.7 °F

  • Highest 14 May, 2026

    91.7 °F

Climate (2021–Present)

Longview - East Texas Regional Airport (9.3 miles)

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  • Average Low 2021–2026

    57.5 °F

  • Average 2021–2026

    67.9 °F

  • Average High 2021–2026

    79.3 °F
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