September Weather in Chalmette, United States

Last updated: June 24, 2025

In September, the average temperature in Chalmette, United States is a warm 27°C (80°F), with a comfortable minimum of 17°C (64°F) and a toasty maximum of 34°C (94°F). Travelers should be prepared for some rain, as 147 mm (5.8 in) of precipitation is expected over 15 days. The atmosphere is quite humid too, with an average humidity level of 79%, making it essential to stay hydrated while enjoying your adventures!

September Temperature in Chalmette

In September in Chalmette, the average temperature is 27°C (80°F). Maximums can reach 34°C (94°F), while minimums can drop to as low as 17°C (64°F). This makes it an ideal time for travelers to enjoy warm weather while having the option to cool off during the evenings.

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

The chart illustrates September temperature patterns in Chalmette, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chalmette, September typically has an average temperature of 27°C (80°F), with highs reaching up to 34°C (94°F) and lows dropping to around 17°C (64°F).

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

September Precipitation in Chalmette

In Chalmette in September, the precipitation amount is 147 mm (5.8 in) over a span of 15 days.

September Precipitation Trends in Chalmette

The chart displays monthly precipitation patterns in Chalmette, 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 Chalmette, September typically receives around 147 mm (5.8 inches) of precipitation spread over approximately 15 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 Chalmette

In Chalmette in September humidity is 79%. With an average temperature of 27°C (80°F), this humidity feels like walking through a warm, dense blanket, making travel feel sluggish and allowing every step to become noticeably heavier.

September Average Humidity in Chalmette

This chart illustrates the average monthly humidity levels in Chalmette, 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 Chalmette 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 Chalmette

In Chalmette in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Chalmette.

Maximum UV Index Levels in Chalmette for September

The chart shows the monthly maximum UV Index (UVI) for Chalmette 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 Chalmette typically reaches 10, which falls under the very high exposure category.

Data source: Chalmette 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 Chalmette Compares to Other Months

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

This table compares monthly weather conditions in Chalmette, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (55°F)	90 mm (3.5 inches)	81%	moderate
February Weather	15°C (60°F)	96 mm (3.8 inches)	81%	very high
March Weather	18°C (65°F)	87 mm (3.4 inches)	79%	very high
April Weather	21°C (70°F)	113 mm (4.5 inches)	81%	extreme
May Weather	25°C (77°F)	144 mm (5.7 inches)	77%	extreme
June Weather	27°C (81°F)	218 mm (8.6 inches)	74%	extreme
July Weather	28°C (83°F)	219 mm (8.6 inches)	74%	extreme
August Weather	28°C (83°F)	273 mm (10.8 inches)	73%	extreme
September Weather	27°C (80°F)	147 mm (5.8 inches)	79%	very high
October Weather	23°C (74°F)	133 mm (5.2 inches)	77%	very high
November Weather	17°C (62°F)	58 mm (2.3 inches)	81%	high
December Weather	14°C (58°F)	101 mm (4.0 inches)	84%	moderate