Chelmsford Weather Forecast

    • 64
    • 79

    Mostly Sunny

    • 72
    • 94

    Slight Chance Thunderstorms

    • 51
    • 89

    Chance Rain Showers

    • 46
    • 67

    Partly Sunny

    • 47
    • 69

    Chance Rain Showers

    • 47
    • 63

    Rain Showers Likely

    • 48
    • 64

    Chance Rain Showers

Today 18 May Central Middlesex County

Sunny. Highs around 80. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 18 May Central Middlesex County

Mostly clear. Lows in the mid 60s. South Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Chelmsford Temperature Statistics

May Temperature

Laurence G Hanscom Field Airport (9.3 miles)

  • Lowest 9 May, 2026

    34 °F

  • Average May

    54.9 °F

  • Highest 5 May, 2026

    81 °F

Climate (2021–Present)

Laurence G Hanscom Field Airport (9.3 miles)

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  • Average Low 2021–2026

    41.3 °F

  • Average 2021–2026

    51.6 °F

  • Average High 2021–2026

    61.6 °F
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