Three Rivers Weather Forecast

    • 30
    • 59

    Chance Rain/Snow

    • 30
    • 60

    Rain Showers Likely

    • 34
    • 65

    Rain Showers Likely

    • 34
    • 63

    Rain Showers

    • 34
    • 67

    Slight Chance Rain Showers

    • 38
    • 75

    Partly Sunny

    • 40
    • 78

    Partly Sunny

Today 3 Sep East Slopes of the Oregon Cascades

Mostly cloudy with a chance of Showers and Thunderstorms. Highs in the upper 40s to upper 50s, except in the upper 50s to lower 60s Valleys. Chance of precipitation 50 percent. Rainfall Amounts less than a tenth of an Inch, except higher Amounts possible in Thunderstorms.

Tonight 3 Sep East Slopes of the Oregon Cascades

Mostly cloudy. A chance of Showers and Thunderstorms in the Evening, then a chance of rain Showers overnight. Lows in the lower 30s to lower 40s. Chance of precipitation 50 percent. Rainfall Amounts less than a quarter of an Inch, except higher Amounts possible in Thunderstorms.

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Three Rivers Temperature Statistics

September Temperature

Bend Airport AWOS (23 miles)

  • Lowest 1 September, 2026

    55.4 °F

  • Average September

    63 °F

  • Highest 1 September, 2026

    77 °F

Climate (2021–2026)

Bend Airport AWOS (23 miles)

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  • Average Low 2021–2026

    38.6 °F

  • Average 2021–2026

    51.4 °F

  • Average High 2021–2026

    64.7 °F
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