Mount Oso Weather Forecast

    • 76
    • 87

    Becoming Sunny

    • 69
    • 80

    Sunny

    • 55
    • 74

    Mostly Sunny

    • 59
    • 66

    Sunny

    • 61
    • 71

    Mostly Sunny

    • 60
    • 71

    Mostly Sunny

    • 61
    • 70

    Mostly Sunny

Today 10 Sep Eastern Diablo Range Above 1000 ft

Mostly sunny. Highs 91 to 101. West Winds up to 15 Mph. Gusts up to 30 Mph in the afternoon.

Tonight 10 Sep Eastern Diablo Range Above 1000 ft

Clear, cooler. Lows 63 to 73. West Winds 10 to 15 Mph with Gusts to around 30 Mph.

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Mount Oso Temperature Statistics

September Temperature

Modesto City-County Airport - Harry Sham Field (24.2 miles)

  • Lowest 1 September, 2026

    54.6 °F

  • Average September

    72.5 °F

  • Highest 8 September, 2026

    96.1 °F

Climate (2021–2026)

Modesto City-County Airport - Harry Sham Field (24.2 miles)

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  • Average Low 2021–2026

    51.8 °F

  • Average 2021–2026

    63.8 °F

  • Average High 2021–2026

    76.3 °F
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