Great Valley Grasslands State Park Weather Forecast

    • 58
    • 82

    Sunny

    • 55
    • 91

    Sunny

    • 57
    • 91

    Sunny

    • 60
    • 95

    Hot

    • 55
    • 94

    Mostly Sunny

    • 53
    • 91

    Mostly Sunny

Today 18 May Merced - Madera - Mendota

Sunny. Highs in the lower 80s. Northwest Winds 5 to 10 Mph increasing to 15 to 20 Mph in the afternoon.

Tonight 18 May Merced - Madera - Mendota

Clear. Lows in the mid 50s. Northwest Winds 5 to 15 Mph. Gusts up to 30 Mph in the evening.

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Great Valley Grasslands State Park Temperature Statistics

May Temperature

Merced / Castle Air Force Base (17.4 miles)

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Climate (2020–Present)

Merced / Castle Air Force Base (17.4 miles)

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  • Average Low 2020–2025

    51.3 °F

  • Average 2020–2025

    61.8 °F

  • Average High 2020–2025

    78.4 °F
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