Rancho San Diego Weather Forecast

    • 50
    • 72

    Areas Fog

    • 50
    • 69

    Chance Rain Showers

    • 49
    • 65

    Chance Rain Showers

    • 43
    • 66

    Mostly Sunny

    • 44
    • 70

    Mostly Sunny

    • 44
    • 72

    Partly Sunny

Today 21 Jan San Diego County Inland Valleys

Areas of fog in the morning. Partly cloudy. Local visibility one quarter mile or less at Times in the morning. Highs 69 to 74. Light Winds.

Tonight 21 Jan San Diego County Inland Valleys

Mostly cloudy. Patchy fog overnight. Lows 43 to 50 in wind Sheltered Areas to 48 to 53 in warmer Locations. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rancho San Diego Temperature Statistics

January Temperature

Gillespie Field Airport (5.6 miles)

  • Lowest 10 January, 2026

    35.6 °F

  • Average January

    53.3 °F

  • Highest 14 January, 2026

    82.4 °F

Climate (2021–Present)

Gillespie Field Airport (5.6 miles)

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  • Average Low 2021–2026

    53.2 °F

  • Average 2021–2026

    60.2 °F

  • Average High 2021–2026

    75.8 °F
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