Middletown Weather Forecast

    • 48
    • 76

    Becoming Sunny

    • 53
    • 87

    Sunny

    • 53
    • 91

    Mostly Sunny

    • 52
    • 87

    Mostly Sunny

    • 52
    • 88

    Sunny

    • 52
    • 89

    Sunny

Today 17 Sep Eastern Lake

Mostly sunny. Patchy fog in the morning. Highs 70 to 80. Northwest wind around 5 Mph shifting to the east in the afternoon.

Tonight 17 Sep Eastern Lake

Mostly clear. Lows 49 to 59. Southwest wind around 5 Mph shifting to the northwest overnight.

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Middletown Temperature Statistics

September Temperature

Santa Rosa, Santa Rosa Sonoma County Airport (20.5 miles)

  • Lowest 5 September, 2026

    46.7 °F

  • Average September

    68 °F

  • Highest 10 September, 2026

    101.6 °F

Climate (2021–2026)

Santa Rosa, Santa Rosa Sonoma County Airport (20.5 miles)

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  • Average Low 2021–2026

    45.9 °F

  • Average 2021–2026

    58.7 °F

  • Average High 2021–2026

    72.9 °F
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