Castle Island Weather Forecast

    • 45
    • 55

    Chance Rain Showers

    • 58
    • 67

    Gradual Clearing

    • 59
    • 77

    Chance Rain Showers

    • 59
    • 81

    Chance Rain Showers

    • 56
    • 71

    Slight Chance Rain Showers

    • 54
    • 76

    Slight Chance Rain Showers

    • 56
    • 72

    Slight Chance Rain Showers

Today 12 Apr Suffolk

Mostly sunny. Highs in the lower 50s. East Winds around 5 Mph, becoming southeast 10 to 15 Mph.

Tonight 12 Apr Suffolk

Cloudy with a 50 percent chance of Showers. Lows in the mid 40s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

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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

    46.7 °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

    46.7 °F

  • Average 2021–2026

    53.6 °F

  • Average High 2021–2026

    61 °F
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