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September Weather in Blue Hills, United States

Last updated: June 24, 2025

In September, the average temperature in Blue Hills, United States is a pleasant 19°C (67°F), with fluctuations ranging from a cool 3°C (37°F) to a warm 35°C (95°F). Expect some rain, as 102 mm (4.0 in) of precipitation typically falls over 9 days. With an average humidity of 68%, it's the perfect time to experience the unique climate of this vibrant destination!

September Temperature in Blue Hills

In September in Blue Hills, the average temperature is 19°C (67°F). Maximum temperatures can reach 35°C (95°F), while minimums can drop as low as 3°C (37°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates September temperature patterns in Blue Hills, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Blue Hills, September typically has an average temperature of 19°C (67°F), with highs reaching up to 35°C (95°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec303339496069757366564234
Data source: Temperature data for Blue Hills 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 Hills

In Blue Hills in September, the total precipitation amount is 102 mm (4.0 in) over a span of 9 days.

September Precipitation Trends in Blue Hills

The chart displays monthly precipitation patterns in Blue Hills, 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 Hills, September typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec678688126113841479010213490120
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Blue Hills

In Blue Hills in September, humidity is 68%. With an average temperature of 19°C (67°F), this humidity feels like a warm, enveloping blanket, making travel pleasant yet slightly muggy, which can be refreshing while exploring but may require occasional breaks to stay comfortable.

September Average Humidity in Blue Hills

This chart illustrates the average monthly humidity levels in Blue Hills, 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 Hills is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Blue Hills

In Blue Hills 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 Hills.

Maximum UV Index Levels in Blue Hills for September

The chart shows the monthly maximum UV Index (UVI) for Blue Hills 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 Hills typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35681010998642
Data source: Blue Hills 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 Hills Compares to Other Months

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

This table compares monthly weather conditions in Blue Hills, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)67 mm (2.6 inches)84%moderate
February Weather1°C (33°F)86 mm (3.4 inches)82%moderate
March Weather4°C (39°F)88 mm (3.5 inches)81%high
April Weather9°C (49°F)126 mm (5.0 inches)78%very high
May Weather15°C (60°F)113 mm (4.4 inches)69%very high
June Weather21°C (69°F)84 mm (3.3 inches)69%very high
July Weather24°C (75°F)147 mm (5.8 inches)62%very high
August Weather23°C (74°F)90 mm (3.5 inches)65%very high
September Weather19°C (67°F)102 mm (4.0 inches)68%very high
October Weather13°C (57°F)134 mm (5.3 inches)74%high
November Weather6°C (43°F)90 mm (3.5 inches)82%moderate
December Weather1°C (34°F)120 mm (4.7 inches)80%low

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