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September Weather in Blue Hill, United States

Last updated: June 24, 2025

In September, the average temperature in Blue Hill, United States reaches a pleasant 21°C (70°F). However, be prepared for a range, as temperatures can dip to a minimum of 4°C (40°F) and soar to a maximum of 36°C (98°F). Expect about 73 mm (2.9 in) of precipitation spread over 6 days, accompanied by an average humidity of 77%.

September Temperature in Blue Hill

In September in Blue Hill, the average temperature is 21°C (70°F). Maximums can reach up to 36°C (98°F), while minimums can drop as low as 4°C (40°F). This varying climate makes Blue Hill an ideal destination for travelers seeking both warm days and cooler evenings.

September Weather in Blue Hill: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Blue Hill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Blue Hill, September typically has an average temperature of 21°C (70°F), with highs reaching up to 36°C (98°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec282742516275797570534133
Data source: Temperature data for Blue Hill 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 Blue Hill

In Blue Hill in September, the precipitation amount is 73 mm (2.9 in) over a span of 6 days.

September Precipitation Trends in Blue Hill

The chart displays monthly precipitation patterns in Blue Hill, 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 Blue Hill, September typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec2719844718171718373742039
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Blue Hill

In Blue Hill in September, humidity is 77%. With an average temperature of 21°C (70°F), this humidity feels like a warm, slightly sticky embrace, making travel invigorating yet slightly uncomfortable as you navigate the vibrant streets and outdoor attractions.

September Average Humidity in Blue Hill

This chart illustrates the average monthly humidity levels in Blue Hill, 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 Blue Hill is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%81%69%71%80%83%84%84%77%72%80%79%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Blue Hill

In Blue Hill 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 Blue Hill.

Maximum UV Index Levels in Blue Hill for September

The chart shows the monthly maximum UV Index (UVI) for Blue Hill 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 Blue Hill typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111108643
Data source: Blue Hill 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 Blue Hill Compares to Other Months

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

This table compares monthly weather conditions in Blue Hill, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)27 mm (1.0 inches)73%moderate
February Weather-3°C (28°F)19 mm (0.8 inches)81%moderate
March Weather6°C (42°F)84 mm (3.3 inches)69%high
April Weather10°C (51°F)47 mm (1.8 inches)71%very high
May Weather17°C (62°F)181 mm (7.1 inches)80%very high
June Weather24°C (76°F)71 mm (2.8 inches)83%extreme
July Weather26°C (79°F)71 mm (2.8 inches)84%extreme
August Weather24°C (75°F)83 mm (3.3 inches)84%very high
September Weather21°C (70°F)73 mm (2.9 inches)77%very high
October Weather11°C (53°F)74 mm (2.9 inches)72%high
November Weather5°C (42°F)20 mm (0.8 inches)80%moderate
December Weather0°C (33°F)39 mm (1.5 inches)79%moderate

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