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September Weather in Port Allen, United States

Last updated: June 24, 2025

In Port Allen, United States, the average temperature in September hovers around 26°C (79°F). Expect a minimum of 12°C (55°F), with highs reaching up to 37°C (98°F). This month typically sees about 135 mm (5.3 in) of precipitation spread over 13 days, and an average humidity level of 79% keeps the atmosphere quite balmy.

September Temperature in Port Allen

In September in Port Allen, the average temperature is 26°C (79°F), with maximums reaching 37°C (98°F) and minimums dropping as low as 12°C (55°F). This pleasant climate makes Port Allen an ideal destination for travelers seeking warm and diverse weather conditions.

September Weather in Port Allen: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Port Allen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Port Allen, September typically has an average temperature of 26°C (79°F), with highs reaching up to 37°C (98°F) and lows dropping to around 12°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec525864687680828179725956
Data source: Temperature data for Port Allen 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 Port Allen

In Port Allen in September, the precipitation amount is 135 mm (5.3 in) over the course of 13 days.

September Precipitation Trends in Port Allen

The chart displays monthly precipitation patterns in Port Allen, 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 Port Allen, September typically receives around 135 mm (5.3 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec1091148315014617318415413511185117
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Port Allen

In Port Allen in September humidity is 79%. With an average temperature of 26°C (79°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel exhausting. Travelers should be prepared for a heavy air that clings to the skin, making hydration essential while navigating the sights and sounds of the city.

September Average Humidity in Port Allen

This chart illustrates the average monthly humidity levels in Port Allen, 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 Port Allen is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%83%80%81%81%78%79%79%79%77%85%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Port Allen

In Port Allen 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 Port Allen.

Maximum UV Index Levels in Port Allen for September

The chart shows the monthly maximum UV Index (UVI) for Port Allen 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 Port Allen typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111112121110965
Data source: Port Allen 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 Port Allen Compares to Other Months

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

This table compares monthly weather conditions in Port Allen, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (53°F)109 mm (4.3 inches)83%moderate
February Weather14°C (58°F)114 mm (4.5 inches)83%very high
March Weather18°C (64°F)83 mm (3.3 inches)80%very high
April Weather20°C (68°F)150 mm (5.9 inches)81%extreme
May Weather24°C (76°F)146 mm (5.7 inches)81%extreme
June Weather27°C (81°F)173 mm (6.8 inches)78%extreme
July Weather28°C (82°F)184 mm (7.2 inches)79%extreme
August Weather27°C (82°F)154 mm (6.1 inches)79%extreme
September Weather26°C (79°F)135 mm (5.3 inches)79%very high
October Weather22°C (72°F)111 mm (4.4 inches)77%very high
November Weather15°C (59°F)84 mm (3.3 inches)85%high
December Weather13°C (56°F)117 mm (4.6 inches)88%moderate

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