Northwest Bellevue Weather Forecast

    • 54
    • 73

    Partly Sunny

    • 54
    • 73

    Partly Sunny

    • 54
    • 72

    Mostly Cloudy

    • 53
    • 69

    Slight Chance Rain

    • 53
    • 68

    Mostly Cloudy

    • 55
    • 70

    Mostly Cloudy

Today 19 Sep Eastside

Mostly cloudy in the morning then becoming mostly sunny. Areas of fog in the morning. Highs near 70. Light wind.

Tonight 19 Sep Eastside

Mostly clear. Lows in the lower to mid 50s. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Northwest Bellevue Temperature Statistics

September Temperature

Boeing Field - King County International Airport (7.5 miles)

  • Lowest 5 September, 2026

    53.1 °F

  • Average September

    62.4 °F

  • Highest 9 September, 2026

    78.1 °F

Climate (2021–2026)

Boeing Field - King County International Airport (7.5 miles)

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  • Average Low 2021–2026

    47.2 °F

  • Average 2021–2026

    54.2 °F

  • Average High 2021–2026

    61.6 °F
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