Diamond Lake Weather Forecast

    • 35
    • 44

    Mostly Cloudy

    • 38
    • 58

    Partly Sunny

    • 37
    • 58

    Partly Sunny

    • 39
    • 59

    Mostly Sunny

    • 40
    • 59

    Mostly Sunny

    • 41
    • 62

    Partly Sunny

    • 35
    • 55

    Partly Sunny

Today 25 Sep South Central Oregon Cascades

Partly cloudy in the morning then clearing. Highs in the lower 50s to lower 60s.

Tonight 25 Sep South Central Oregon Cascades

Mostly cloudy. Patchy fog late this evening and overnight. Lows in the lower to mid 30s. Northwest Winds 5 to 10 Mph shifting to the northeast after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Diamond Lake Temperature Statistics

September Temperature

Roseburg Regional Airport (60.9 miles)

  • Lowest 15 September, 2026

    47.6 °F

  • Average September

    64.4 °F

  • Highest 9 September, 2026

    93.7 °F

Climate (2021–2026)

Roseburg Regional Airport (60.9 miles)

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  • Average Low 2021–2026

    47 °F

  • Average 2021–2026

    57 °F

  • Average High 2021–2026

    67.9 °F
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