September Weather in Brunswick, United States

Last updated: June 24, 2025

In September, the average temperature in Brunswick, United States hovers around 24°C (76°F), with minimums dipping to 10°C (50°F) and maximums soaring to 35°C (95°F). Expect 162 mm (6.4 in) of precipitation over approximately 11 days, and enjoy the atmosphere with an average humidity of 79%.

September Temperature in Brunswick

In September in Brunswick, the average temperature is 24°C (76°F). The maximum can reach 35°C (95°F), while the minimum can be as low as 10°C (50°F). Be prepared for warm days and cooler nights when traveling during this time.

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

The chart illustrates September temperature patterns in Brunswick, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brunswick, September typically has an average temperature of 24°C (76°F), with highs reaching up to 35°C (95°F) and lows dropping to around 10°C (50°F).

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

September Precipitation in Brunswick

In Brunswick in September, the total precipitation amount is 162 mm (6.4 in), which falls over the course of 11 days.

September Precipitation Trends in Brunswick

The chart displays monthly precipitation patterns in Brunswick, 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 Brunswick, September typically receives around 162 mm (6.4 inches) of precipitation spread over approximately 11 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 Brunswick

In Brunswick in September, humidity is 79%. With an average temperature of 24°C (76°F), this humidity feels like a thick blanket wrapped around you, making traveling somewhat uncomfortable and sticky, as you navigate through the warmth while constantly seeking shade and hydration.

September Average Humidity in Brunswick

This chart illustrates the average monthly humidity levels in Brunswick, 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 Brunswick is approximately 79%, 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 Brunswick

In Brunswick in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Brunswick.

Maximum UV Index Levels in Brunswick for September

The chart shows the monthly maximum UV Index (UVI) for Brunswick 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 Brunswick typically reaches 9, which falls under the very high exposure category.

Data source: Brunswick 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 Brunswick Compares to Other Months

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

This table compares monthly weather conditions in Brunswick, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (48°F)	76 mm (3.0 inches)	85%	moderate
February Weather	12°C (53°F)	87 mm (3.4 inches)	82%	high
March Weather	13°C (56°F)	65 mm (2.6 inches)	81%	very high
April Weather	18°C (64°F)	97 mm (3.8 inches)	80%	very high
May Weather	22°C (72°F)	135 mm (5.3 inches)	81%	extreme
June Weather	25°C (77°F)	158 mm (6.2 inches)	81%	extreme
July Weather	27°C (80°F)	159 mm (6.3 inches)	81%	extreme
August Weather	26°C (80°F)	203 mm (8.0 inches)	80%	very high
September Weather	24°C (76°F)	162 mm (6.4 inches)	79%	very high
October Weather	20°C (68°F)	61 mm (2.4 inches)	80%	very high
November Weather	13°C (55°F)	92 mm (3.6 inches)	85%	high
December Weather	10°C (51°F)	127 mm (5.0 inches)	86%	moderate