Castle Island Weather Forecast

    • 49
    • 73

    Chance Rain Showers

    • 46
    • 60

    Chance Rain Showers

    • 46
    • 62

    Partly Sunny

    • 50
    • 63

    Rain Showers Likely

    • 50
    • 62

    Rain Showers Likely

    • 50
    • 64

    Chance Rain Showers

Today 10 May Suffolk

Mostly cloudy. A slight chance of Showers in the Morning, then a chance of Showers with isolated Thunderstorms in the afternoon. Areas of fog in the morning. Not as cool with Highs in the lower 70s. Southwest Winds 5 to 10 Mph. Gusts up to 20 Mph in the afternoon. Chance of rain 30 percent.

Tonight 10 May Suffolk

Mostly cloudy. Lows in the upper 40s. Northwest Winds 5 to 10 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

    58 °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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