September Weather in Blue Hill, United States

Last updated: June 24, 2025

In September, the average temperature in Blue Hill, United States is a mild 16°C (62°F). Expect cool evenings with temperatures dipping as low as 5°C (41°F), while daytime highs can reach a pleasant 27°C (81°F). Be prepared for some rain, as 89 mm (3.5 in) of precipitation may fall over about 7 days, contributing to an average humidity level of 77%.

September Temperature in Blue Hill

In September in Blue Hill, the average temperature is 16°C (62°F). Maximums can reach 27°C (81°F), while minimums can drop as low as 5°C (41°F). This mild climate makes Blue Hill an ideal destination for travelers seeking pleasant weather conditions.

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 16°C (62°F), with highs reaching up to 27°C (81°F) and lows dropping to around 5°C (41°F).

Data source: Temperature data for Blue Hill generated using information from the Copernicus Climate Change Service.

September Precipitation in Blue Hill

In Blue Hill in September, the total precipitation amount is 89 mm (3.5 in) spread over a period of 7 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 89 mm (3.5 inches) of precipitation spread over approximately 7 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Blue Hill

In Blue Hill in September, humidity is 77%. With an average temperature of 16°C (62°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities feel heavy and draining, so travelers may want to plan for breaks in shaded areas and stay hydrated.

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.

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 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 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 7, which falls under the high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	95 mm (3.8 inches)	88%	low
February Weather	-3°C (26°F)	89 mm (3.5 inches)	88%	moderate
March Weather	0°C (32°F)	72 mm (2.8 inches)	85%	moderate
April Weather	6°C (43°F)	131 mm (5.2 inches)	81%	high
May Weather	11°C (52°F)	90 mm (3.6 inches)	76%	very high
June Weather	16°C (61°F)	76 mm (3.0 inches)	74%	very high
July Weather	19°C (67°F)	83 mm (3.3 inches)	74%	very high
August Weather	20°C (68°F)	71 mm (2.8 inches)	74%	very high
September Weather	16°C (62°F)	89 mm (3.5 inches)	77%	high
October Weather	11°C (52°F)	115 mm (4.5 inches)	82%	moderate
November Weather	4°C (40°F)	126 mm (5.0 inches)	85%	moderate
December Weather	-2°C (30°F)	136 mm (5.4 inches)	84%	low