Boston Harbor - Chelsea Weather Forecast

    • 61
    • 77

    Slight Chance Rain Showers

    • 52
    • 78

    Mostly Sunny

    • 48
    • 68

    Mostly Sunny

    • 53
    • 70

    Partly Sunny

    • 59
    • 76

    Mostly Sunny

    • 62
    • 80

    Partly Sunny

Today 18 Sep Suffolk

Mostly cloudy with a chance of Showers in the Morning, then mostly sunny in the afternoon. Patchy fog in the morning. Highs in the upper 70s. North Winds around 5 Mph, becoming east in the afternoon. Chance of rain 40 percent.

Tonight 18 Sep Suffolk

Showers likely with isolated Thunderstorms. Patchy fog. Near steady temperature in the lower 60s. North Winds around 5 Mph. Chance of rain 60 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Boston Harbor - Chelsea Temperature Statistics

September Temperature

Boston, Logan International Airport (1.9 miles)

  • Lowest 9 September, 2025

    54 °F

  • Average September

    65.6 °F

  • Highest 6 September, 2025

    86 °F

Climate (2020–Present)

Boston, Logan International Airport (1.9 miles)

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

  • Average Low 2020–2025

    46.9 °F

  • Average 2020–2025

    53.8 °F

  • Average High 2020–2025

    61.1 °F
Get WillyWeather+ to remove ads