Irvine Slough Weather Forecast

    • 57
    • 78

    Increasing Clouds

    • 57
    • 80

    Mostly Sunny

    • 57
    • 81

    Mostly Sunny

    • 56
    • 80

    Partly Sunny

    • 55
    • 75

    Partly Sunny

    • 54
    • 74

    Partly Sunny

    • 54
    • 76

    Mostly Sunny

Today 21 Jul Lowlands of Western Skagit and Northwestern Snohomish Counties

Sunny. A slight chance of Showers late in the afternoon. Highs in the upper 60s to mid 70s. Light wind becoming west to 10 Mph in the afternoon.

Tonight 21 Jul Lowlands of Western Skagit and Northwestern Snohomish Counties

Partly cloudy. A slight chance of Showers in the evening. A slight chance of Showers in the morning. Lows in the 50s. Southwest wind to 10 Mph becoming south after midnight.

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Irvine Slough Temperature Statistics

July Temperature

Arlington Municipal Airport (10.6 miles)

  • Lowest 4 July, 2025

    46 °F

  • Average July

    64.9 °F

  • Highest 16 July, 2025

    91 °F

Climate (2020–Present)

Arlington Municipal Airport (10.6 miles)

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  • Average Low 2020–2025

    42.3 °F

  • Average 2020–2025

    50.5 °F

  • Average High 2020–2025

    59.7 °F
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