September Weather in Brielle, United States

Last updated: June 24, 2025

In Brielle, United States, the average temperature in September is a pleasant 21°C (71°F). Visitors can expect a minimum temperature of 11°C (53°F) and a maximum of 30°C (86°F). Be prepared for occasional rain, as 101 mm (4.0 in) of precipitation typically falls over 10 days. Don't forget that the average humidity stands at a comfortable 74%, adding to the region's inviting atmosphere.

September Temperature in Brielle

In September in Brielle, the average temperature is 21°C (71°F). The maximum can reach 30°C (86°F), while the minimum can drop as low as 11°C (53°F). This pleasant climate makes Brielle an ideal destination for travelers seeking comfortable weather and outdoor adventures.

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

The chart illustrates September temperature patterns in Brielle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brielle, September typically has an average temperature of 21°C (71°F), with highs reaching up to 30°C (86°F) and lows dropping to around 11°C (53°F).

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

September Precipitation in Brielle

In Brielle in September, the precipitation amount is 101 mm (4.0 in) spread over the course of 10 days.

September Precipitation Trends in Brielle

The chart displays monthly precipitation patterns in Brielle, 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 Brielle, September typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 10 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 Brielle

In Brielle in September, humidity is 74%. With an average temperature of 21°C (71°F), this humidity feels like traveling through a warm, damp blanket, making outdoor excursions feel sticky and a bit stifling, often prompting the need for frequent breaks to stay refreshed.

September Average Humidity in Brielle

This chart illustrates the average monthly humidity levels in Brielle, 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 Brielle is approximately 74%, 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 Brielle

In Brielle 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 Brielle.

Maximum UV Index Levels in Brielle for September

The chart shows the monthly maximum UV Index (UVI) for Brielle 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 Brielle typically reaches 8, which falls under the very high exposure category.

Data source: Brielle 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 Brielle Compares to Other Months

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

This table compares monthly weather conditions in Brielle, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (38°F)	77 mm (3.0 inches)	83%	moderate
February Weather	4°C (39°F)	124 mm (4.9 inches)	82%	moderate
March Weather	6°C (43°F)	110 mm (4.3 inches)	81%	high
April Weather	11°C (51°F)	118 mm (4.6 inches)	79%	very high
May Weather	15°C (60°F)	126 mm (4.9 inches)	74%	very high
June Weather	21°C (70°F)	84 mm (3.3 inches)	77%	very high
July Weather	25°C (77°F)	129 mm (5.1 inches)	76%	very high
August Weather	24°C (76°F)	131 mm (5.2 inches)	77%	very high
September Weather	21°C (71°F)	101 mm (4.0 inches)	74%	very high
October Weather	17°C (63°F)	159 mm (6.2 inches)	75%	high
November Weather	10°C (50°F)	102 mm (4.0 inches)	80%	moderate
December Weather	6°C (42°F)	127 mm (5.0 inches)	81%	moderate