Castle Island Weather Forecast

    • 47
    • 64

    Partly Sunny

    • 47
    • 62

    Partly Sunny

    • 51
    • 63

    Rain Showers

    • 50
    • 63

    Rain Showers

    • 53
    • 66

    Slight Chance Rain Showers

    • 53
    • 71

    Partly Sunny

Today 11 May Suffolk

Partly sunny. Highs in the mid 60s. Northwest Winds 5 to 10 Mph.

Tonight 11 May Suffolk

Partly cloudy. Lows in the mid 40s. Northwest Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Island Temperature Statistics

May Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 3 May, 2026

    44.7 °F

  • Average May

    57.6 °F

  • Highest 5 May, 2026

    79.6 °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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