Great Valley Grasslands State Park Weather Forecast

    • 53
    • 79

    Increasing Clouds

    • 56
    • 80

    Mostly Sunny

    • 57
    • 81

    Mostly Sunny

    • 55
    • 81

    Mostly Sunny

    • 57
    • 82

    Mostly Sunny

    • 59
    • 83

    Mostly Sunny

Today 1 Sep Merced - Madera - Mendota

Sunny. Highs in the upper 70s. Northwest Winds up to 10 Mph.

Tonight 1 Sep Merced - Madera - Mendota

Mostly clear. Lows in the lower 50s. Northwest Winds 5 to 10 Mph.

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Great Valley Grasslands State Park Temperature Statistics

September Temperature

Merced / Castle Air Force Base (17.4 miles)

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Climate (2021–2026)

Merced / Castle Air Force Base (17.4 miles)

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  • Average Low 2021–2026

    51.1 °F

  • Average 2021–2026

    60.6 °F

  • Average High 2021–2026

    75.5 °F
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