Chelmsford Weather Forecast

    • 63
    • 83

    Slight Chance Rain Showers

    • 65
    • 86

    Partly Sunny

    • 59
    • 84

    Chance Rain Showers

    • 59
    • 82

    Partly Sunny

    • 61
    • 79

    Chance Rain Showers

    • 61
    • 79

    Chance Rain Showers

Today 18 Aug Central Middlesex County

Mostly cloudy in the Morning, then partly sunny with a slight chance of Showers in the afternoon. Patchy fog in the morning. Humid with Highs in the lower 80s. North Winds around 5 Mph. Chance of rain 20 percent.

Tonight 18 Aug Central Middlesex County

Partly cloudy in the Evening, then becoming mostly cloudy. Patchy fog after midnight. Humid with Lows in the mid 60s. Northeast Winds around 5 Mph in the Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Chelmsford Temperature Statistics

August Temperature

Laurence G Hanscom Field Airport (9.3 miles)

  • Lowest 15 August, 2026

    53.1 °F

  • Average August

    74.9 °F

  • Highest 7 August, 2026

    91 °F

Climate (2021–2026)

Laurence G Hanscom Field Airport (9.3 miles)

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  • Average Low 2021–2026

    41.3 °F

  • Average 2021–2026

    51.7 °F

  • Average High 2021–2026

    61.7 °F
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