Castle Island Weather Forecast

    • 36
    • 50

    Rain Showers

    • 36
    • 48

    Chance Rain Showers

    • 30
    • 48

    Rain Likely

    • 34
    • 48

    Mostly Sunny

    • 41
    • 55

    Partly Sunny

    • 47
    • 65

    Partly Sunny

    • 46
    • 65

    Mostly Cloudy

Today 5 Apr Suffolk

Showers with isolated Thunderstorms. Near steady temperature in the upper 50s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 90 percent.

Tonight 5 Apr Suffolk

Cloudy with Showers this Evening, then partly cloudy after midnight. Areas of fog this evening. Lows in the mid 30s. West Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 80 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Island Temperature Statistics

April Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 2 April, 2026

    37.7 °F

  • Average April

    48.7 °F

  • Highest 1 April, 2026

    71.7 °F

Climate (2021–Present)

Boston, Logan International Airport (1.2 miles)

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  • Average Low 2021–2026

    46.8 °F

  • Average 2021–2026

    53.6 °F

  • Average High 2021–2026

    61 °F
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