Santa Margarita River Mouth Weather Forecast

    • 52
    • 65

    Patchy Fog

    • 53
    • 64

    Partly Sunny

    • 53
    • 67

    Partly Sunny

    • 54
    • 66

    Partly Sunny

    • 54
    • 67

    Mostly Cloudy

    • 53
    • 66

    Mostly Cloudy

    • 53
    • 63

    Mostly Cloudy

Today 14 Dec San Diego County Coastal Areas

Patchy fog this morning. Partly cloudy. Local visibility one quarter mile or less at Times this morning. Highs 65 to 68 near the coast to 69 to 73 inland. Light Winds becoming northwest 10 Mph this afternoon.

Tonight 14 Dec San Diego County Coastal Areas

Partly cloudy this evening. Becoming mostly cloudy. Patchy fog overnight. Local visibility one quarter mile or less at Times overnight. Lows 47 to 52. Light Winds.

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  • Temperature Real-Time

Santa Margarita River Mouth Temperature Statistics

December Temperature

Oceanside, Oceanside Municipal Airport (3.7 miles)

  • Lowest 2 December, 2025

    41 °F

  • Average December

    62 °F

  • Highest 9 December, 2025

    79 °F

Climate (2020–Present)

Oceanside, Oceanside Municipal Airport (3.7 miles)

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  • Average Low 2020–2025

    52.8 °F

  • Average 2020–2025

    62.3 °F

  • Average High 2020–2025

    71.6 °F
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