Boston Harbor - Chelsea Weather Forecast

    • 48
    • 64

    Becoming Sunny

    • 50
    • 63

    Partly Sunny

    • 49
    • 63

    Rain Showers Likely

    • 50
    • 59

    Rain Showers Likely

    • 53
    • 68

    Chance Rain Showers

    • 57
    • 77

    Partly Sunny

Today 21 May Suffolk

Mostly cloudy. A slight chance of Showers this morning. Much cooler. Near steady temperature in the lower 60s. Northeast Winds 5 to 10 Mph, becoming east this afternoon. Chance of rain 20 percent.

Tonight 21 May Suffolk

Mostly cloudy in the Evening, then becoming partly cloudy. Cooler with Lows in the upper 40s. East Winds around 5 Mph, becoming north around 5 Mph after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Boston Harbor - Chelsea Temperature Statistics

May Temperature

Boston, Logan International Airport (1.9 miles)

  • Lowest 9 May, 2026

    42.7 °F

  • Average May

    59.9 °F

  • Highest 19 May, 2026

    96.1 °F

Climate (2021–Present)

Boston, Logan International Airport (1.9 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    46.7 °F

  • Average 2021–2026

    53.6 °F

  • Average High 2021–2026

    61 °F
Get WillyWeather+ to remove ads