Castle Rock Weather Forecast

    • 62
    • 65

    Rain Showers Likely

    • 64
    • 68

    Becoming Sunny

    • 55
    • 69

    Mostly Sunny

    • 53
    • 60

    Mostly Sunny

    • 56
    • 63

    Partly Sunny

    • 62
    • 68

    Mostly Sunny

    • 64
    • 72

    Partly Sunny

Today 17 Sep Eastern Essex

Mostly sunny. Near steady temperature in the upper 60s. East Winds 5 to 10 Mph.

Tonight 17 Sep Eastern Essex

Mostly cloudy. A chance of Showers this Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Patchy fog after midnight. Lows in the upper 50s. East Winds around 5 Mph, becoming north after midnight. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Rock Temperature Statistics

September Temperature

Boston, Logan International Airport (6.2 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 (6.2 miles)

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  • Average Low 2020–2025

    46.9 °F

  • Average 2020–2025

    53.8 °F

  • Average High 2020–2025

    61.1 °F
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