Declezville Weather Forecast

    • 55
    • 84

    Mostly Sunny

    • 53
    • 79

    Mostly Sunny

    • 53
    • 76

    Partly Sunny

    • 52
    • 76

    Partly Sunny

    • 51
    • 75

    Mostly Cloudy

    • 52
    • 70

    Mostly Cloudy

Today 18 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 82 to 86. Areas of Winds east to 10 Mph in the morning becoming light.

Tonight 18 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 49 to 52 in wind Sheltered Areas to 53 to 59 in warmer Locations. Light Winds.

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Declezville Temperature Statistics

December Temperature

Ontario International Airport (5 miles)

  • Lowest 2 December, 2025

    46 °F

  • Average December

    61.3 °F

  • Highest 10 December, 2025

    84.9 °F

Climate (2020–Present)

Ontario International Airport (5 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    66.6 °F

  • Average High 2020–2025

    78.9 °F
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