Lostine Reservoir Weather Forecast

    • 52
    • 78

    Mostly Sunny

    • 53
    • 80

    Mostly Sunny

    • 50
    • 79

    Partly Sunny

    • 50
    • 76

    Partly Sunny

    • 45
    • 69

    Mostly Sunny

    • 50
    • 74

    Mostly Sunny

Today 17 Sep Wallowa County

Sunny. Highs in the upper 60s to upper 70s, except in the upper 70s to mid 80s Valleys.

Tonight 17 Sep Wallowa County

Mostly clear. Lows in the upper 40s to upper 50s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lostine Reservoir Temperature Statistics

September Temperature

La Grande/Union County Airport (29.8 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 (29.8 miles)

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  • Average Low 2020–2025

    37.9 °F

  • Average 2020–2025

    50.2 °F

  • Average High 2020–2025

    62.3 °F
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