Castle Rock Weather Forecast

    • 56
    • 60

    Increasing Clouds

    • 56
    • 63

    Rain Showers

    • 55
    • 62

    Mostly Cloudy

    • 55
    • 58

    Mostly Cloudy

    • 55
    • 58

    Slight Chance Rain Showers

    • 55
    • 58

    Chance Rain Showers

    • 55
    • 58

    Chance Rain Showers

Today 19 Sep Eastern Essex

Mostly cloudy with a 40 percent chance of Showers. Breezy with Highs in the mid 60s.

Tonight 19 Sep Eastern Essex

Mostly clear this Evening, then becoming partly cloudy. Lows in the mid 40s. South Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Rock Temperature Statistics

September Temperature

Boston, Logan International Airport (6.2 miles)

  • Lowest 15 September, 2026

    53.7 °F

  • Average September

    69.1 °F

  • Highest 10 September, 2026

    87.7 °F

Climate (2021–2026)

Boston, Logan International Airport (6.2 miles)

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  • Average Low 2021–2026

    46.6 °F

  • Average 2021–2026

    53.6 °F

  • Average High 2021–2026

    61 °F
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