Castle Island Weather Forecast

    • 64
    • 74

    Decreasing Clouds

    • 58
    • 72

    Mostly Sunny

    • 57
    • 71

    Mostly Sunny

    • 62
    • 77

    Partly Sunny

    • 63
    • 80

    Chance Rain Showers

    • 55
    • 72

    Chance Rain Showers

Today 18 Sep Suffolk

Cloudy in the Morning, then becoming mostly sunny. Patchy fog in the morning. Visibility one quarter mile or less at Times in the morning. Not as cool. Humid with Highs in the upper 70s. North Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

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Castle Island Temperature Statistics

September Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 3 September, 2021

    59 °F

  • Average September

    71.5 °F

  • Highest 8 September, 2021

    84.9 °F

Climate (2010–Present)

Boston, Logan International Airport (1.2 miles)

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  • Average Low 2010–Present

    47.2 °F

  • Average 2010–Present

    53.8 °F

  • Average High 2010–Present

    60.8 °F
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