Sammamish Weather Forecast

    • 50
    • 73

    Increasing Clouds

    • 52
    • 72

    Mostly Cloudy

    • 51
    • 69

    Mostly Cloudy

    • 48
    • 66

    Mostly Cloudy

    • 49
    • 64

    Chance Rain

    • 47
    • 62

    Chance Rain

Today 20 Sep Eastside

Mostly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the mid to upper 60s. Light wind.

Tonight 20 Sep Eastside

Mostly clear. Patchy fog in the morning. Lows in the upper 40s to mid 50s. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sammamish Temperature Statistics

September Temperature

Renton Municipal Airport (11.8 miles)

  • Lowest 6 September, 2026

    51.1 °F

  • Average September

    61.9 °F

  • Highest 9 September, 2026

    79 °F

Climate (2021–2026)

Renton Municipal Airport (11.8 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    54.7 °F

  • Average High 2021–2026

    62.2 °F
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