La Grande Reservoir Weather Forecast

    • 28
    • 39

    Rain/Snow

    • 20
    • 36

    Snow

    • 22
    • 31

    Snow Likely

    • 29
    • 35

    Rain/Snow

    • 26
    • 36

    Chance Snow

    • 29
    • 35

    Snow Likely

    • 25
    • 37

    Snow Likely

Today 18 Dec Southern Blue Mountains of Oregon

Rain and mountain snow. Mountain snow accumulation up to 2 Inches Valleys and 2 to 5 Inches in the Mountains. Snow level 4000 feet in the morning. Highs in the lower 40s to lower 50s. South wind 5 to 15 Mph. Gusts up to 30 Mph increasing to 45 Mph in the afternoon. Chance of precipitation near 100 percent.

Tonight 18 Dec Southern Blue Mountains of Oregon

Rain in the Evening, then rain and high mountain snow overnight. No high mountain snow accumulation. Lows in the upper 20s to mid 30s. Windy. Southwest wind 15 to 25 Mph with Gusts to around 50 Mph. Chance of precipitation near 100 percent.

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La Grande Reservoir Temperature Statistics

December Temperature

La Grande/Union County Airport (13.7 miles)

  • Lowest 1 December, 2025

    23 °F

  • Average December

    42.9 °F

  • Highest 11 December, 2025

    57.9 °F

Climate (2020–Present)

La Grande/Union County Airport (13.7 miles)

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  • Average Low 2020–2025

    38.2 °F

  • Average 2020–2025

    50.4 °F

  • Average High 2020–2025

    62.5 °F
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