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Climate almanac

Chelmsford

Massachusetts, United States · 42.60°, -71.37°

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What is the weather like in Chelmsford in September?

In September, Chelmsford is typically 74°F (24°C) during the day and 58°F (14°C) at night. The month brings about 3.4 in (85 mm) of precipitation in total.

  • Average high74°F (24°C)
  • Average low58°F (14°C)
  • Precipitation3.4 in (85 mm)
  • Clear or mostly clear days11
  • Based on2016-2025 daily ERA5 reanalysis data (10-year normals)