Caswell Memorial State Park Weather Forecast

    • 66
    • 88

    Chance Rain Showers

    • 62
    • 82

    Chance Rain Showers

    • 61
    • 86

    Mostly Sunny

    • 62
    • 88

    Sunny

    • 66
    • 92

    Mostly Sunny

    • 62
    • 87

    Slight Chance Rain Showers

Today 18 Sep Northern San Joaquin Valley

Mostly cloudy. Highs 83 to 91. Light Winds becoming south up to 10 Mph in the afternoon.

Tonight 18 Sep Northern San Joaquin Valley

Cloudy. A slight chance of rain Showers in the Evening, then a chance of rain Showers after midnight. Lows 63 to 69. Southwest Winds up to 10 Mph in the evening becoming light.

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Caswell Memorial State Park Temperature Statistics

September Temperature

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

  • Lowest 5 September, 2025

    61 °F

  • Average September

    75.2 °F

  • Highest 2 September, 2025

    102 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    51.2 °F

  • Average 2020–2025

    63.3 °F

  • Average High 2020–2025

    76.1 °F
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