Newcastle Weather Forecast

    • 40
    • 48

    Rain Likely

    • 38
    • 48

    Rain Likely

    • 35
    • 50

    Mostly Sunny

    • 38
    • 50

    Mostly Cloudy

    • 40
    • 49

    Rain Likely

    • 36
    • 46

    Rain Likely

Today 8 Feb Foothills and Valleys of Central King County

Mostly cloudy. Patchy fog until late afternoon. A slight chance of rain in the afternoon. Highs near 50. Light wind.

Tonight 8 Feb Foothills and Valleys of Central King County

Mostly cloudy. A chance of rain in the evening. Rain likely after midnight. Patchy fog in the late evening and early morning. Rainfall Amounts less than a tenth of an inch likely. Lows near 40. Light wind becoming south to 10 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Newcastle Temperature Statistics

February Temperature

Renton Municipal Airport (3.7 miles)

  • Lowest 6 February, 2026

    37.9 °F

  • Average February

    49 °F

  • Highest 4 February, 2026

    60.1 °F

Climate (2021–Present)

Renton Municipal Airport (3.7 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    54.6 °F

  • Average High 2021–2026

    62.3 °F
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