Seneca Weather Forecast

    • 23
    • 40

    Rain/Snow

    • 25
    • 40

    Rain/Snow Likely

    • 30
    • 40

    Rain/Snow

    • 23
    • 41

    Chance Snow

    • 19
    • 40

    Rain/Snow Likely

    • 14
    • 35

    Chance Snow

    • 18
    • 36

    Mostly Cloudy

Today 21 Dec Ochoco-John Day Highlands

Patchy fog in the morning. Rain and high mountain snow. High mountain snow accumulation up to 1 inch. Highs in the upper 30s to lower 40s. Gusts up to 20 Mph in the afternoon. Chance of precipitation near 100 percent.

Tonight 21 Dec Ochoco-John Day Highlands

Mostly cloudy. Rain and high mountain snow likely in the Evening, then a chance of rain and high mountain snow overnight. No high mountain snow accumulation. Snow level 5000 feet overnight. Lows in the mid to upper 20s. Chance of precipitation 70 percent.

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Seneca Temperature Statistics

December Temperature

Grant County Regional Airport (18 miles)

  • Lowest 1 December, 2025

    18.3 °F

  • Average December

    42 °F

  • Highest 15 December, 2025

    60.4 °F

Climate (2020–Present)

Grant County Regional Airport (18 miles)

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  • Average Low 2020–2025

    39.2 °F

  • Average 2020–2025

    50.5 °F

  • Average High 2020–2025

    62.3 °F
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