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September Weather in New England, United States

Last updated: June 24, 2025

In September, the average temperature in New England, United States is a pleasant 16°C (60°F). However, be prepared for extremes, as it can drop to a chilly -1°C (30°F) or rise to a sweltering 35°C (96°F). Expect around 52 mm (2.0 in) of precipitation spread over 6 days, and an average humidity level of 68% adds a bit of mugginess to the air.

September Temperature in New England

In September in New England, the average temperature is 16°C (60°F). The maximum can reach 35°C (96°F) and the minimum can be as low as -1°C (30°F). Travelers should be prepared for a wide temperature range, making layered clothing a smart choice for this time of year.

September Weather in New England: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in New England, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In New England, September typically has an average temperature of 16°C (60°F), with highs reaching up to 35°C (96°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec191531405467736960433224
Data source: Temperature data for New England generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in New England

In New England, in September, the precipitation amount is 52 mm (2.0 in) over the course of 6 days.

September Precipitation Trends in New England

The chart displays monthly precipitation patterns in New England, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In New England, September typically receives around 52 mm (2.0 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec111722326346586652521618
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in New England

In New England in September, humidity is 68%. With an average temperature of 16°C (60°F), this humidity feels like a warm embrace, making traveling slightly more strenuous as the air thickens around you, prompting you to stay hydrated and take breaks in cooler, shaded areas.

September Average Humidity in New England

This chart illustrates the average monthly humidity levels in New England, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in New England is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%86%77%72%77%79%78%74%68%70%80%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in New England

In New England in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in New England.

Maximum UV Index Levels in New England for September

The chart shows the monthly maximum UV Index (UVI) for New England in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in New England typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec25599101098532
Data source: New England September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in New England Compares to Other Months

Weather in New England varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in New England, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in New England, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (19°F)11 mm (0.4 inches)83%low
February Weather-10°C (15°F)17 mm (0.7 inches)86%moderate
March Weather-1°C (31°F)22 mm (0.9 inches)77%moderate
April Weather4°C (40°F)32 mm (1.3 inches)72%very high
May Weather12°C (54°F)63 mm (2.5 inches)77%very high
June Weather20°C (68°F)46 mm (1.8 inches)79%very high
July Weather23°C (73°F)58 mm (2.3 inches)78%very high
August Weather21°C (70°F)66 mm (2.6 inches)74%very high
September Weather16°C (60°F)52 mm (2.0 inches)68%very high
October Weather6°C (43°F)52 mm (2.0 inches)70%moderate
November Weather0°C (32°F)16 mm (0.6 inches)80%moderate
December Weather-4°C (25°F)18 mm (0.7 inches)84%low

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