Santee Weather Forecast

    • 62
    • 85

    Increasing Clouds

    • 65
    • 87

    Mostly Sunny

    • 64
    • 90

    Mostly Sunny

    • 69
    • 90

    Mostly Sunny

    • 70
    • 91

    Partly Sunny

    • 69
    • 90

    Patchy Fog

Today 18 Aug San Diego County Inland Valleys

Partly cloudy with patchy fog this morning. Becoming mostly sunny. Highs 79 to 84 in the western Valleys to 86 to 91 near the Foothills. Light Winds becoming west 10 Mph this afternoon.

Tonight 18 Aug San Diego County Inland Valleys

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Lows 58 to 62. Areas of Winds west to 10 Mph in the evening becoming light.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Santee Temperature Statistics

August Temperature

Gillespie Field Airport (0.6 miles)

  • Lowest 3 August, 2025

    60.8 °F

  • Average August

    69 °F

  • Highest 7 August, 2025

    98.6 °F

Climate (2020–Present)

Gillespie Field Airport (0.6 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    52.9 °F

  • Average 2020–2025

    60.2 °F

  • Average High 2020–2025

    76 °F
Get WillyWeather+ to remove ads