Island City Weather Forecast

    • 47
    • 85

    Mostly Sunny

    • 49
    • 86

    Mostly Sunny

    • 49
    • 86

    Partly Sunny

    • 50
    • 84

    Partly Sunny

    • 46
    • 76

    Mostly Sunny

    • 50
    • 82

    Mostly Sunny

Today 17 Sep Grande Ronde Valley

Sunny. Highs in the mid 80s. Southeast wind 5 to 10 Mph.

Tonight 17 Sep Grande Ronde Valley

Mostly clear. Lows in the mid to upper 40s. Light wind.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Island City Temperature Statistics

September Temperature

La Grande/Union County Airport (3.7 miles)

  • Lowest 13 September, 2025

    46 °F

  • Average September

    68.3 °F

  • Highest 2 September, 2025

    100.9 °F

Climate (2020–Present)

La Grande/Union County Airport (3.7 miles)

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

  • Average Low 2020–2025

    37.9 °F

  • Average 2020–2025

    50.2 °F

  • Average High 2020–2025

    62.3 °F
Get WillyWeather+ to remove ads