September Weather in Paris, United States

Last updated: June 24, 2025

In September, the average temperature in Paris, United States hovers around 24°C (75°F). Although you might enjoy warm days, be prepared for cooler evenings with minimum temperatures dipping to 11°C (51°F) and the occasional heatwave reaching up to 37°C (98°F). Expect about 105 mm (4.1 in) of rainfall spread across 6 days, contributing to an average humidity level of 75%. Enjoy your trip and pack accordingly!

September Temperature in Paris

In September in Paris, the average temperature is 24°C (75°F). Maximums can reach 37°C (98°F) and minimums can be as low as 11°C (51°F). Therefore, it's advisable to pack both lightweight clothing for the daytime heat and warmer layers for cooler evenings.

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

The chart illustrates September temperature patterns in Paris, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Paris, September typically has an average temperature of 24°C (75°F), with highs reaching up to 37°C (98°F) and lows dropping to around 11°C (51°F).

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

September Precipitation in Paris

In Paris in September, the precipitation amount reaches 105 mm (4.1 in) over a span of 6 days.

September Precipitation Trends in Paris

The chart displays monthly precipitation patterns in Paris, 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 Paris, September typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 6 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 Paris

In Paris in September humidity is 75%. With average temperature 24°C (75°F), this humidity feels like a thick blanket wrapping around you, making outdoor activities feel especially stifling and leaving you yearning for cool breezes and refreshingly cold drinks.

September Average Humidity in Paris

This chart illustrates the average monthly humidity levels in Paris, 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 Paris is approximately 75%, 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 Paris

In Paris 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 Paris.

Maximum UV Index Levels in Paris for September

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

Data source: Paris 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 Paris Compares to Other Months

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

This table compares monthly weather conditions in Paris, 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 (40°F)	100 mm (3.9 inches)	86%	moderate
February Weather	6°C (44°F)	169 mm (6.6 inches)	84%	high
March Weather	11°C (53°F)	160 mm (6.3 inches)	84%	high
April Weather	15°C (59°F)	159 mm (6.3 inches)	80%	very high
May Weather	21°C (70°F)	126 mm (5.0 inches)	82%	extreme
June Weather	25°C (78°F)	115 mm (4.5 inches)	83%	extreme
July Weather	27°C (81°F)	119 mm (4.7 inches)	79%	extreme
August Weather	26°C (79°F)	117 mm (4.6 inches)	76%	very high
September Weather	24°C (75°F)	105 mm (4.1 inches)	75%	very high
October Weather	17°C (63°F)	127 mm (5.0 inches)	74%	high
November Weather	9°C (49°F)	96 mm (3.8 inches)	85%	moderate
December Weather	7°C (45°F)	131 mm (5.1 inches)	88%	moderate