Cooper Weather Forecast

    • 50
    • 73

    Mostly Sunny

    • 54
    • 81

    Sunny

    • 56
    • 86

    Mostly Sunny

    • 57
    • 84

    Partly Sunny

    • 57
    • 86

    Mostly Sunny

    • 55
    • 86

    Mostly Sunny

Today 17 Sep Western Lake

Mostly sunny. Patchy fog in the morning. Highs 70 to 80. South wind around 5 Mph.

Tonight 17 Sep Western Lake

Mostly clear. Lows 49 to 59. West wind around 5 Mph shifting to the northwest overnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Cooper Temperature Statistics

September Temperature

Ukiah Municipal Airport (11.8 miles)

  • Lowest 6 September, 2026

    45.6 °F

  • Average September

    68.4 °F

  • Highest 10 September, 2026

    100.7 °F

Climate (2021–2026)

Ukiah Municipal Airport (11.8 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    47.1 °F

  • Average 2021–2026

    60.9 °F

  • Average High 2021–2026

    76.1 °F
Get WillyWeather+ to remove ads