Whelan Lake Weather Forecast

    • 64
    • 82

    Increasing Clouds

    • 62
    • 80

    Partly Sunny

    • 63
    • 75

    Mostly Cloudy

    • 60
    • 72

    Mostly Cloudy

    • 60
    • 72

    Partly Sunny

    • 60
    • 74

    Patchy Fog

    • 61
    • 76

    Partly Sunny

Today 7 Sep San Diego County Coastal Areas

Partly cloudy with patchy fog this morning. Becoming mostly sunny. Highs 76 to 81 near the coast to 83 to 88 inland. Light Winds becoming west 10 Mph this afternoon.

Tonight 7 Sep San Diego County Coastal Areas

Mostly clear this evening. Becoming partly cloudy. Lows 61 to 66. Light Winds.

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Whelan Lake Temperature Statistics

September Temperature

Oceanside, Oceanside Municipal Airport (1.9 miles)

  • Lowest 1 September, 2025

    61 °F

  • Average September

    71.4 °F

  • Highest 2 September, 2025

    82 °F

Climate (2020–Present)

Oceanside, Oceanside Municipal Airport (1.9 miles)

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  • Average Low 2020–2025

    52.7 °F

  • Average 2020–2025

    62.3 °F

  • Average High 2020–2025

    71.8 °F
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