Castle Island Weather Forecast

    • 47
    • 56

    Rain Showers

    • 45
    • 55

    Rain Showers

    • 42
    • 58

    Partly Sunny

    • 43
    • 58

    Partly Sunny

    • 42
    • 57

    Partly Sunny

    • 46
    • 60

    Slight Chance Rain Showers

Today 29 Apr Suffolk

Mostly cloudy in the Morning, then becoming mostly sunny. Highs in the upper 50s. Northeast Winds 5 to 10 Mph.

Tonight 29 Apr Suffolk

A chance of Showers in the Evening, then Showers after midnight. Patchy fog after midnight. Lows in the upper 40s. East Winds 5 to 10 Mph. Chance of rain 90 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 8 April, 2026

    29.6 °F

  • Average April

    50 °F

  • Highest 14 April, 2026

    78.7 °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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