Castle Island Weather Forecast

    • 64
    • 90

    Smoke

    • 66
    • 82

    Mostly Sunny

    • 69
    • 81

    Rain Showers Likely

    • 65
    • 81

    Slight Chance Thunderstorms

    • 67
    • 80

    Partly Sunny

    • 68
    • 80

    Chance Rain Showers

Today 16 Jul Suffolk

Partly sunny with a 20 percent chance of Showers. Patchy smoke. Hot. Near steady temperature in the upper 80s. West Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 16 Jul Suffolk

Partly cloudy with a slight chance of Showers in the Evening, then mostly clear after midnight. Smoke in the evening. Lows in the lower 60s. Northwest Winds 10 to 15 Mph. Gusts up to 25 Mph in the evening. Chance of rain 20 percent.

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  • Temperature Real-Time

Castle Island Temperature Statistics

July Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 8 July, 2026

    61.6 °F

  • Average July

    78.5 °F

  • Highest 2 July, 2026

    101.6 °F

Climate (2021–2026)

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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