Simi Valley Weather Forecast

    • 58
    • 82

    Mostly Sunny

    • 58
    • 78

    Mostly Sunny

    • 55
    • 81

    Mostly Sunny

    • 52
    • 78

    Mostly Sunny

    • 52
    • 73

    Mostly Cloudy

    • 52
    • 71

    Mostly Cloudy

Today 16 Dec Southeastern Ventura County Valleys

Sunny. Highs in the upper 70s to mid 80s. Northeast Winds around 15 Mph shifting to the north in the afternoon.

Tonight 16 Dec Southeastern Ventura County Valleys

Clear in the evening then partly cloudy. Fog after midnight. Fog locally dense with visibility one quarter mile or less. Lows in the 50s to around 60. Northeast Winds around 15 Mph after midnight.

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Simi Valley Temperature Statistics

December Temperature

Van Nuys, Van Nuys Airport (14.9 miles)

  • Lowest 2 December, 2025

    43 °F

  • Average December

    61.8 °F

  • Highest 10 December, 2025

    84 °F

Climate (2020–Present)

Van Nuys, Van Nuys Airport (14.9 miles)

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  • Average Low 2020–2025

    56.5 °F

  • Average 2020–2025

    67.4 °F

  • Average High 2020–2025

    79.3 °F
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