Castle Island Weather Forecast

    • 52
    • 62

    Rain Showers

    • 49
    • 73

    Rain Showers

    • 46
    • 60

    Rain Showers

    • 44
    • 62

    Partly Sunny

    • 47
    • 63

    Chance Rain Showers

    • 47
    • 62

    Chance Rain Showers

Today 9 May Suffolk

A chance of Showers in the Morning, then Showers in the afternoon. Highs in the upper 50s. Southwest Winds 5 to 10 Mph, becoming southeast 10 to 15 Mph with Gusts up to 25 Mph in the afternoon. Chance of rain near 100 percent.

Tonight 9 May Suffolk

Mostly cloudy. Showers, mainly in the evening. Patchy fog. Near steady temperature in the lower 50s. South Winds 10 to 15 Mph. Gusts up to 25 Mph in the evening. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

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Castle Island Temperature Statistics

May Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 3 May, 2026

    44.7 °F

  • Average May

    57.7 °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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