Castle Island Weather Forecast

    • 70
    • 86

    Mostly Cloudy

    • 66
    • 89

    Chance Rain Showers

    • 64
    • 82

    Mostly Sunny

    • 70
    • 85

    Partly Sunny

    • 74
    • 90

    Mostly Sunny

    • 74
    • 93

    Slight Chance Rain Showers

    • 70
    • 85

    Chance Thunderstorms

Today 2 Jul Suffolk

Mostly cloudy. Near steady temperature in the mid 80s. Southwest Winds 10 to 15 Mph.

Tonight 2 Jul Suffolk

Partly cloudy. Lows in the upper 60s. Southwest Winds 10 to 15 Mph.

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Castle Island Temperature Statistics

July Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest

  • Average July

  • Highest

Climate (2020–Present)

Boston, Logan International Airport (1.2 miles)

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  • Average Low 2020–2025

    47 °F
  • Average 2020–2025

    53.8 °F
  • Average High 2020–2025

    61.1 °F
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