September Weather in Dunkirk, United States

Last updated: June 24, 2025

The average temperature in Dunkirk, United States during September is a pleasant 21°C (69°F). However, temperatures can range from a brisk 5°C (41°F) to a warm 34°C (93°F). Expect about 63 mm (2.5 in) of precipitation spread across 9 days, with an average humidity level of 78%, creating a refreshing atmosphere.

September Temperature in Dunkirk

In September in Dunkirk, the average temperature is 21°C (69°F). The maximum can reach 34°C (93°F), while the minimum can dip as low as 5°C (41°F). This makes it an ideal destination for travelers looking to enjoy a comfortable climate with a variety of temperature experiences.

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

The chart illustrates September temperature patterns in Dunkirk, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Dunkirk, September typically has an average temperature of 21°C (69°F), with highs reaching up to 34°C (93°F) and lows dropping to around 5°C (41°F).

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

September Precipitation in Dunkirk

In Dunkirk in September, the total precipitation amount is 63 mm (2.5 in) spread over a duration of 9 days.

September Precipitation Trends in Dunkirk

The chart displays monthly precipitation patterns in Dunkirk, 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 Dunkirk, September typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Dunkirk

In Dunkirk in September, humidity is 78%. With an average temperature of 21°C (69°F), this humidity feels like a warm embrace that clings to your skin, making outdoor activities feel more intense and leaving you yearning for refreshing breezes or a cool drink as you explore.

September Average Humidity in Dunkirk

This chart illustrates the average monthly humidity levels in Dunkirk, 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 Dunkirk is approximately 78%, 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 Dunkirk

In Dunkirk 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 Dunkirk.

Maximum UV Index Levels in Dunkirk for September

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

Data source: Dunkirk 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 Dunkirk Compares to Other Months

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

This table compares monthly weather conditions in Dunkirk, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	75 mm (3.0 inches)	85%	moderate
February Weather	-1°C (31°F)	79 mm (3.1 inches)	85%	moderate
March Weather	5°C (42°F)	102 mm (4.0 inches)	86%	high
April Weather	10°C (51°F)	96 mm (3.8 inches)	87%	very high
May Weather	17°C (64°F)	158 mm (6.2 inches)	81%	very high
June Weather	23°C (73°F)	103 mm (4.1 inches)	82%	very high
July Weather	25°C (77°F)	101 mm (4.0 inches)	81%	very high
August Weather	23°C (74°F)	105 mm (4.1 inches)	79%	very high
September Weather	21°C (69°F)	63 mm (2.5 inches)	78%	very high
October Weather	14°C (57°F)	107 mm (4.2 inches)	81%	high
November Weather	5°C (41°F)	76 mm (3.0 inches)	89%	moderate
December Weather	2°C (35°F)	64 mm (2.5 inches)	86%	low