Clearlake Weather Forecast

    • 43
    • 61

    Rain

    • 41
    • 58

    Rain

    • 44
    • 55

    Rain

    • 43
    • 58

    Rain

    • 38
    • 56

    Rain Likely

    • 38
    • 53

    Rain

Today 18 Dec Southern Lake County

Mostly cloudy. Patchy valley fog in the morning. Chance of rain through the day. Highs 54 to 64.

Tonight 18 Dec Southern Lake County

Cloudy. Rain likely in the Evening, then rain overnight. Lows 42 to 52.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Clearlake Temperature Statistics

December Temperature

Ukiah Municipal Airport (32.9 miles)

  • Lowest 13 December, 2025

    30 °F

  • Average December

    47.4 °F

  • Highest 10 December, 2025

    72 °F

Climate (2020–Present)

Ukiah Municipal Airport (32.9 miles)

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

  • Average Low 2020–2025

    47 °F

  • Average 2020–2025

    60.7 °F

  • Average High 2020–2025

    76 °F
Get WillyWeather+ to remove ads