nomadseason

September Weather in North Boston, United States

Last updated: June 24, 2025

In September, the average temperature in North Boston, United States hovers around 18°C (64°F), making it a pleasant time to visit. Expect minimums of 3°C (38°F) and maximums reaching up to 31°C (89°F). Be prepared for some rain, as the area experiences approximately 76 mm (3.0 in) of precipitation over about 9 days. With an average humidity of 76%, it’s best to stay hydrated and enjoy the vibrant atmosphere!

September Temperature in North Boston

In September in North Boston, the average temperature is 18°C (64°F). The maximum can reach 31°C (89°F) and the minimum can be as low as 3°C (38°F). This moderate climate makes North Boston a great destination for travelers seeking pleasant weather.

September Weather in North Boston: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in North Boston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In North Boston, September typically has an average temperature of 18°C (64°F), with highs reaching up to 31°C (89°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec272935455866727064543932
Data source: Temperature data for North Boston generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in North Boston

In North Boston in September, the precipitation amount is 76 mm (3.0 in) spread over a period of 9 days.

September Precipitation Trends in North Boston

The chart displays monthly precipitation patterns in North Boston, 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 North Boston, September typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec87908011910789127857613499105
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in North Boston

In North Boston in September, humidity is 76%. With an average temperature of 18°C (64°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities feel steamy and invigorating—perfect for exploring charming streets, though you might want to take breaks in the shade.

September Average Humidity in North Boston

This chart illustrates the average monthly humidity levels in North Boston, 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 North Boston is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in North Boston

In North Boston 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 North Boston.

Maximum UV Index Levels in North Boston for September

The chart shows the monthly maximum UV Index (UVI) for North Boston 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 North Boston typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: North Boston 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 North Boston Compares to Other Months

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

This table compares monthly weather conditions in North Boston, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)87 mm (3.4 inches)91%moderate
February Weather-2°C (29°F)90 mm (3.5 inches)91%moderate
March Weather2°C (35°F)80 mm (3.2 inches)88%high
April Weather7°C (45°F)119 mm (4.7 inches)88%very high
May Weather14°C (58°F)107 mm (4.2 inches)82%very high
June Weather19°C (67°F)89 mm (3.5 inches)79%very high
July Weather22°C (72°F)127 mm (5.0 inches)77%very high
August Weather21°C (70°F)85 mm (3.3 inches)72%very high
September Weather18°C (64°F)76 mm (3.0 inches)76%very high
October Weather12°C (54°F)134 mm (5.3 inches)83%high
November Weather4°C (40°F)99 mm (3.9 inches)88%moderate
December Weather0°C (33°F)105 mm (4.1 inches)87%low

Compare North Boston's Climate with Cities Worldwide