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September Weather in New Boston, United States

Last updated: June 24, 2025

In September, the average temperature in New Boston, United States hovers around 21°C (69°F). Expect a range that can dip to a brisk 6°C (43°F) and soar up to a sweltering 35°C (95°F). With 105 mm (4.1 in) of precipitation over 9 days, you might want to keep an umbrella handy. The air tends to be quite humid, with an average humidity level of 78%.

September Temperature in New Boston

In September in New Boston, the average temperature is 21°C (69°F). Maximums can reach 35°C (95°F), while minimums can dip as low as 6°C (43°F). It's advisable to pack layers to accommodate the temperature fluctuations during your travels.

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

The chart illustrates September temperature patterns in New Boston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In New Boston, September typically has an average temperature of 21°C (69°F), with highs reaching up to 35°C (95°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec242741506374777469553933
Data source: Temperature data for New Boston 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 Boston

In New Boston in September, the total precipitation amount reaches 105 mm (4.1 in) over the course of 9 days.

September Precipitation Trends in New Boston

The chart displays monthly precipitation patterns in New 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 New Boston, September typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec5360949215513379651051295148
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in New Boston

In New Boston in September, humidity is 78%. With an average temperature of 21°C (69°F), this humidity feels like a warm embrace that clings to your skin, making outdoor activities feel more intense and leaving you yearning for refreshing breezes or a cool drink as you explore.

September Average Humidity in New Boston

This chart illustrates the average monthly humidity levels in New 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 New Boston is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%81%81%82%78%81%79%77%78%79%87%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in New Boston

In New 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 New Boston.

Maximum UV Index Levels in New Boston for September

The chart shows the monthly maximum UV Index (UVI) for New 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 New Boston typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098642
Data source: New 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 New Boston Compares to Other Months

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

This table compares monthly weather conditions in New Boston, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)53 mm (2.1 inches)81%moderate
February Weather-3°C (27°F)60 mm (2.4 inches)81%moderate
March Weather5°C (41°F)94 mm (3.7 inches)81%high
April Weather10°C (50°F)92 mm (3.6 inches)82%very high
May Weather17°C (63°F)155 mm (6.1 inches)78%very high
June Weather24°C (75°F)133 mm (5.2 inches)81%extreme
July Weather25°C (78°F)79 mm (3.1 inches)79%very high
August Weather24°C (75°F)64 mm (2.5 inches)77%very high
September Weather21°C (69°F)105 mm (4.1 inches)78%very high
October Weather13°C (55°F)129 mm (5.1 inches)78%high
November Weather4°C (40°F)51 mm (2.0 inches)87%moderate
December Weather0°C (33°F)48 mm (1.9 inches)84%low

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