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September Weather in Louisiana, United States

Last updated: June 24, 2025

In September, the average temperature in Louisiana, United States hovers around 22°C (71°F). Expect temperatures to range from a crisp 7°C (44°F) to a balmy 34°C (94°F). During this time, precipitation typically amounts to 76 mm (3.0 in) over 7 days, with an average humidity level of 76%.

September Temperature in Louisiana

In September in Louisiana, the average temperature is 22°C (71°F), with maximums reaching up to 34°C (94°F) and minimums dropping as low as 7°C (44°F). This climate makes it an ideal time for outdoor adventures and enjoyable sightseeing.

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

The chart illustrates September temperature patterns in Louisiana, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Louisiana, September typically has an average temperature of 22°C (71°F), with highs reaching up to 34°C (94°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec303345536675797571574337
Data source: Temperature data for Louisiana generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Louisiana

In Louisiana in September, the precipitation amount is 76 mm (3.0 in) over a period of 7 days.

September Precipitation Trends in Louisiana

The chart displays monthly precipitation patterns in Louisiana, 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 Louisiana, September typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec6763133115168115111112761036548
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Louisiana

In Louisiana in September, humidity is 76%. With an average temperature of 22°C (71°F), this humidity feels like traveling through a warm, dense mist that clings to your skin, making every step feel heavier and the air seem thicker, which can be quite draining for outdoor activities.

September Average Humidity in Louisiana

This chart illustrates the average monthly humidity levels in Louisiana, 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 Louisiana is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%80%82%83%81%80%76%76%85%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Louisiana

In Louisiana 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 Louisiana.

Maximum UV Index Levels in Louisiana for September

The chart shows the monthly maximum UV Index (UVI) for Louisiana 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 Louisiana typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109643
Data source: Louisiana 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 Louisiana Compares to Other Months

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

This table compares monthly weather conditions in Louisiana, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)67 mm (2.6 inches)82%moderate
February Weather0°C (33°F)63 mm (2.5 inches)80%moderate
March Weather7°C (45°F)133 mm (5.2 inches)80%high
April Weather12°C (54°F)115 mm (4.5 inches)80%very high
May Weather19°C (66°F)168 mm (6.6 inches)82%very high
June Weather24°C (76°F)115 mm (4.5 inches)83%extreme
July Weather26°C (79°F)111 mm (4.4 inches)81%extreme
August Weather24°C (75°F)112 mm (4.4 inches)80%very high
September Weather22°C (71°F)76 mm (3.0 inches)76%very high
October Weather14°C (58°F)103 mm (4.0 inches)76%high
November Weather6°C (43°F)65 mm (2.6 inches)85%moderate
December Weather3°C (37°F)48 mm (1.9 inches)86%moderate

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