Whelan Lake Weather Forecast

    • 62
    • 81

    Decreasing Clouds

    • 65
    • 84

    Mostly Sunny

    • 71
    • 91

    Mostly Sunny

    • 74
    • 96

    Mostly Sunny

    • 74
    • 94

    Mostly Sunny

    • 74
    • 93

    Mostly Sunny

Today 30 Sep San Diego County Coastal Areas

Partly cloudy this morning. Becoming mostly sunny. Highs 75 to 79 near the coast to 80 to 83 inland. Areas of Winds south 10 Mph.

Tonight 30 Sep San Diego County Coastal Areas

Partly cloudy. Patchy fog overnight. Lows 60 to 65. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Whelan Lake Temperature Statistics

September Temperature

Oceanside, Oceanside Municipal Airport (1.9 miles)

  • Lowest 3 September, 2026

    56.6 °F

  • Average September

    73.7 °F

  • Highest 7 September, 2026

    100.7 °F

Climate (2021–2026)

Oceanside, Oceanside Municipal Airport (1.9 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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