Union Valley Reservoir Weather Forecast

    • 49
    • 73

    Mostly Sunny

    • 53
    • 79

    Sunny

    • 54
    • 81

    Sunny

    • 53
    • 80

    Mostly Sunny

    • 53
    • 79

    Mostly Sunny

    • 51
    • 74

    Mostly Sunny

Today 14 Sep West Slope Northern Sierra Nevada

Sunny. Highs 61 to 76 higher Elevations. 72 to 84 lower Elevations. Prevailing south Winds up to 10 Mph shifting to the southwest in the afternoon.

Tonight 14 Sep West Slope Northern Sierra Nevada

Clear. Lows 41 to 56 higher Elevations. 51 to 66 lower Elevations. Prevailing west Winds up to 10 Mph shifting to the east after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Union Valley Reservoir Temperature Statistics

September Temperature

Placerville Airport (21.1 miles)

  • Lowest 10 September, 2025

    50 °F

  • Average September

    72.2 °F

  • Highest 2 September, 2025

    98.6 °F

Climate (2020–Present)

Placerville Airport (21.1 miles)

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

  • Average Low 2020–2025

    52.4 °F

  • Average 2020–2025

    60.7 °F

  • Average High 2020–2025

    69.2 °F
Get WillyWeather+ to remove ads