Umatilla National Forest Weather Forecast

    • 41
    • 58

    Mostly Cloudy

    • 44
    • 63

    Mostly Sunny

    • 45
    • 60

    Rain Showers

    • 46
    • 65

    Mostly Sunny

    • 49
    • 69

    Mostly Sunny

    • 51
    • 72

    Mostly Sunny

Today 15 Sep Southern Blue Mountains of Oregon

Mostly cloudy. Highs in the upper 50s to upper 60s.

Tonight 15 Sep Southern Blue Mountains of Oregon

Mostly cloudy. A 20 percent chance of rain Showers overnight. Lows in the upper 30s to mid 40s.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Umatilla National Forest Temperature Statistics

September Temperature

Grant County Regional Airport (35.4 miles)

  • Lowest 4 September, 2026

    37.8 °F

  • Average September

    58.1 °F

  • Highest 10 September, 2026

    86.4 °F

Climate (2021–2026)

Grant County Regional Airport (35.4 miles)

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

  • Average Low 2021–2026

    39 °F

  • Average 2021–2026

    50.3 °F

  • Average High 2021–2026

    62 °F
Get WillyWeather+ to remove ads