Santa Margarita River Mouth Weather Forecast

    • 63
    • 72

    Gradual Clearing

    • 63
    • 72

    Partly Sunny

    • 65
    • 73

    Partly Sunny

    • 65
    • 74

    Mostly Cloudy

    • 64
    • 73

    Partly Sunny

    • 65
    • 73

    Partly Sunny

Today 17 Sep San Diego County Coastal Areas

Partly cloudy. Highs 71 to 75 near the coast to 75 to 78 inland. Light Winds becoming west 10 to 15 Mph this afternoon.

Tonight 17 Sep San Diego County Coastal Areas

Partly cloudy in the evening. Becoming cloudy. Lows 58 to 64. Areas of Winds northwest 10 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Santa Margarita River Mouth Temperature Statistics

September Temperature

Oceanside, Oceanside Municipal Airport (3.7 miles)

  • Lowest 3 September, 2026

    56.6 °F

  • Average September

    75.2 °F

  • Highest 7 September, 2026

    100.7 °F

Climate (2021–2026)

Oceanside, Oceanside Municipal Airport (3.7 miles)

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  • Average Low 2021–2026

    53 °F

  • Average 2021–2026

    62.8 °F

  • Average High 2021–2026

    72.3 °F
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