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September Weather in Bangor, United States

Last updated: June 24, 2025

In Bangor, United States, the average temperature for September hovers around 19°C (67°F), with a minimum drop to 3°C (37°F) and a peak reaching up to 34°C (94°F). Expect about 82 mm (3.2 in) of precipitation spread over 10 days, contributing to an average humidity of 79%.

September Temperature in Bangor

In September in Bangor, the average temperature is 19°C (67°F). Maximums can reach 34°C (94°F), while minimums can be as low as 3°C (37°F). Pack accordingly to enjoy the varied climate during your travels!

September Weather in Bangor: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Bangor, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bangor, September typically has an average temperature of 19°C (67°F), with highs reaching up to 34°C (94°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec272837466071757266544034
Data source: Temperature data for Bangor 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 Bangor

In Bangor in September, the total precipitation amount is 82 mm (3.2 in) observed over a span of 10 days.

September Precipitation Trends in Bangor

The chart displays monthly precipitation patterns in Bangor, 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 Bangor, September typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec74748410116213811385821447266
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bangor

In Bangor in September, humidity is 79%. With an average temperature of 19°C (67°F), this humidity feels like a warm, enveloping blanket that makes traveling a bit more challenging, as the air is thick and can leave you feeling sluggish during outdoor adventures.

September Average Humidity in Bangor

This chart illustrates the average monthly humidity levels in Bangor, 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 Bangor is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%87%82%81%78%79%80%82%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bangor

In Bangor in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Bangor.

Maximum UV Index Levels in Bangor for September

The chart shows the monthly maximum UV Index (UVI) for Bangor 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 Bangor typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101097532
Data source: Bangor 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 Bangor Compares to Other Months

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

This table compares monthly weather conditions in Bangor, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)74 mm (2.9 inches)87%moderate
February Weather-2°C (28°F)74 mm (2.9 inches)87%moderate
March Weather3°C (38°F)84 mm (3.3 inches)86%high
April Weather8°C (47°F)101 mm (4.0 inches)87%very high
May Weather15°C (60°F)162 mm (6.4 inches)82%very high
June Weather21°C (71°F)138 mm (5.4 inches)81%very high
July Weather24°C (75°F)113 mm (4.5 inches)78%very high
August Weather22°C (72°F)85 mm (3.3 inches)79%very high
September Weather19°C (67°F)82 mm (3.2 inches)79%high
October Weather12°C (54°F)144 mm (5.7 inches)82%moderate
November Weather4°C (40°F)72 mm (2.8 inches)87%moderate
December Weather1°C (34°F)66 mm (2.6 inches)86%low

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