Castle Island Weather Forecast

    • 48
    • 69

    Rain Showers Likely

    • 54
    • 65

    Chance Rain Showers

    • 48
    • 70

    Chance Rain Showers

    • 49
    • 57

    Chance Rain Showers

    • 38
    • 61

    Rain Showers Likely

    • 34
    • 49

    Slight Chance Rain Showers

    • 43
    • 55

    Slight Chance Rain Showers

Today 15 Apr Suffolk

Partly sunny with a 30 percent chance of Showers. Cooler with Highs in the upper 60s. East Winds 5 to 10 Mph.

Tonight 15 Apr Suffolk

Mostly cloudy. A slight chance of Showers and Thunderstorms this Evening, then a chance of Showers and Thunderstorms after midnight. Patchy fog. Lows in the lower 50s. East Winds 5 to 10 Mph. Chance of rain 50 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Island Temperature Statistics

April Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 8 April, 2026

    29.6 °F

  • Average April

    48.1 °F

  • Highest 1 April, 2026

    71.7 °F

Climate (2021–Present)

Boston, Logan International Airport (1.2 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