Watertown Weather Forecast

    • 46
    • 64

    Increasing Clouds

    • 56
    • 65

    Rain Showers

    • 52
    • 65

    Slight Chance Rain Showers

    • 51
    • 61

    Mostly Cloudy

    • 50
    • 61

    Mostly Cloudy

    • 51
    • 60

    Chance Rain Showers

Today 19 Sep Southeast Middlesex

Sunny. Much cooler with Highs in the mid 60s. North Winds around 5 Mph, becoming east in the afternoon.

Tonight 19 Sep Southeast Middlesex

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

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Watertown Temperature Statistics

September Temperature

Laurence G Hanscom Field Airport (8.7 miles)

  • Lowest 15 September, 2026

    41 °F

  • Average September

    65.3 °F

  • Highest 4 September, 2026

    84 °F

Climate (2021–2026)

Laurence G Hanscom Field Airport (8.7 miles)

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  • Average Low 2021–2026

    41.2 °F

  • Average 2021–2026

    51.6 °F

  • Average High 2021–2026

    61.7 °F
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