Merrimac Weather Forecast

    • 66
    • 78

    Sunny

    • 66
    • 80

    Mostly Sunny

    • 64
    • 78

    Mostly Cloudy

    • 62
    • 67

    Chance Rain Showers

    • 62
    • 69

    Slight Chance Rain Showers

    • 64
    • 73

    Mostly Sunny

Today 16 Sep Western Plumas County/Lassen Park

Sunny. Highs 69 to 84 higher Elevations. 75 to 89 lower Elevations. Prevailing east Winds up to 10 Mph shifting to the southwest in the afternoon.

Tonight 16 Sep Western Plumas County/Lassen Park

Clear. Lows 51 to 66. Light Winds becoming east up to 10 Mph after midnight.

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Merrimac Temperature Statistics

September Temperature

Oroville Municipal Airport (24.9 miles)

  • Lowest 7 September, 2025

    59 °F

  • Average September

    75.8 °F

  • Highest 1 September, 2025

    100 °F

Climate (2020–Present)

Oroville Municipal Airport (24.9 miles)

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  • Average Low 2020–2025

    53 °F

  • Average 2020–2025

    64.9 °F

  • Average High 2020–2025

    77.1 °F
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