San Joaquin River National Wildlife Refuge Weather Forecast

    • 41
    • 48

    Mostly Cloudy

    • 43
    • 48

    Partly Sunny

    • 43
    • 49

    Partly Sunny

    • 43
    • 49

    Partly Sunny

    • 43
    • 50

    Mostly Cloudy

    • 44
    • 57

    Mostly Cloudy

    • 47
    • 57

    Mostly Cloudy

Today 9 Dec Northern San Joaquin Valley

Mostly cloudy. Widespread fog early in the morning. Haze through the day. Areas of fog late in the Morning, then patchy fog early in the afternoon. Highs 44 to 53. Light Winds.

Tonight 9 Dec Northern San Joaquin Valley

Mostly cloudy. Haze through the night. Patchy fog in the late evening and early Morning, then widespread fog. Locally dense late in the night. Lows 39 to 45. Light Winds.

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San Joaquin River National Wildlife Refuge Temperature Statistics

December Temperature

Modesto City-County Airport - Harry Sham Field (13 miles)

  • Lowest 4 December, 2025

    36 °F

  • Average December

    44 °F

  • Highest 3 December, 2025

    54 °F

Climate (2020–Present)

Modesto City-County Airport - Harry Sham Field (13 miles)

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  • Average Low 2020–2025

    51.4 °F

  • Average 2020–2025

    63.3 °F

  • Average High 2020–2025

    75.9 °F
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