Boston Harbor - Chelsea Weather Forecast

    • 56
    • 90

    Chance Rain Showers

    • 49
    • 66

    Partly Sunny

    • 50
    • 67

    Chance Rain Showers

    • 48
    • 60

    Rain Showers Likely

    • 49
    • 60

    Chance Rain Showers

    • 52
    • 66

    Slight Chance Rain Showers

Today 20 May Suffolk

Partly sunny. A chance of Showers with a slight chance of Thunderstorms this afternoon. Hot with Highs in the lower 90s. West Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 30 percent.

Tonight 20 May Suffolk

Partly cloudy in the Evening, then becoming mostly cloudy. A 20 percent chance of Showers. Cooler. Less humid with Lows in the mid 50s. West Winds 10 to 15 Mph, becoming northwest 5 to 10 Mph after midnight.

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Boston Harbor - Chelsea Temperature Statistics

May Temperature

Boston, Logan International Airport (1.9 miles)

  • Lowest 9 May, 2026

    42.7 °F

  • Average May

    58.5 °F

  • Highest 17 May, 2026

    88 °F

Climate (2021–Present)

Boston, Logan International Airport (1.9 miles)

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  • Average Low 2021–2026

    46.7 °F

  • Average 2021–2026

    53.6 °F

  • Average High 2021–2026

    60.9 °F
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