La Grande/Union County Airport Weather Forecast

    • 39
    • 73

    Chance Thunderstorms

    • 36
    • 65

    Partly Sunny

    • 39
    • 69

    Partly Sunny

    • 43
    • 73

    Partly Sunny

    • 45
    • 79

    Mostly Sunny

    • 43
    • 79

    Partly Sunny

Today 29 May Grande Ronde Valley

Partly cloudy. A chance of Showers and Thunderstorms in the afternoon. Highs in the lower to mid 70s. Light Wind, becoming west 5 to 10 Mph with Gusts to around 25 Mph in the afternoon. Chance of precipitation 50 percent. Rainfall Amounts less than a tenth of an Inch, except higher Amounts possible in Thunderstorms.

Tonight 29 May Grande Ronde Valley

Mostly cloudy. Lows around 40. Breezy. Northwest wind 10 to 20 Mph.

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La Grande/Union County Airport Temperature Statistics

May Temperature

La Grande/Union County Airport (0 miles)

  • Lowest 19 May, 2026

    33.1 °F

  • Average May

    58.1 °F

  • Highest 12 May, 2026

    91 °F

Climate (2021–Present)

La Grande/Union County Airport (0 miles)

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  • Average Low 2021–2026

    38.4 °F

  • Average 2021–2026

    50.7 °F

  • Average High 2021–2026

    62.9 °F
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