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September Weather in Lafayette, United States

Last updated: June 24, 2025

In September, the average temperature in Lafayette, United States is a warm 25°C (77°F), making it a pleasant time to visit. However, be prepared for temperatures that can dip to a cool 12°C (53°F) or soar as high as 37°C (98°F). Expect some rain, with an average precipitation of 98 mm (3.8 in) spread over 8 days. Additionally, the humidity hovers around a comfortable 73%, ensuring a vibrant and lush environment.

September Temperature in Lafayette

In September in Lafayette, the average temperature is 25°C (77°F). The maximum can reach 37°C (98°F), and the minimum can be as low as 12°C (53°F). It’s advisable to pack light clothing for the warm days and a sweater for the cooler evenings during your travels.

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

The chart illustrates September temperature patterns in Lafayette, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lafayette, September typically has an average temperature of 25°C (77°F), with highs reaching up to 37°C (98°F) and lows dropping to around 12°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec485459647277807976685450
Data source: Temperature data for Lafayette 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 Lafayette

In Lafayette in September, the precipitation amount is 98 mm (3.8 in) during a span of 8 days.

September Precipitation Trends in Lafayette

The chart displays monthly precipitation patterns in Lafayette, 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 Lafayette, September typically receives around 98 mm (3.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec1081461131281111191001179810883139
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lafayette

In Lafayette in September humidity is 73%. With an average temperature of 25°C (77°F), this humidity feels like a warm blanket wrapping around you, making travel a bit sticky but also vibrant and lively, as the air carries the rich scents of the surrounding environment.

September Average Humidity in Lafayette

This chart illustrates the average monthly humidity levels in Lafayette, 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 Lafayette is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%81%77%77%72%73%73%85%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lafayette

In Lafayette 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 Lafayette.

Maximum UV Index Levels in Lafayette for September

The chart shows the monthly maximum UV Index (UVI) for Lafayette 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 Lafayette typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478101111111110864
Data source: Lafayette 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 Lafayette Compares to Other Months

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

This table compares monthly weather conditions in Lafayette, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)108 mm (4.3 inches)85%moderate
February Weather12°C (54°F)146 mm (5.7 inches)84%high
March Weather15°C (59°F)113 mm (4.4 inches)82%very high
April Weather18°C (64°F)128 mm (5.0 inches)82%very high
May Weather22°C (72°F)111 mm (4.4 inches)81%extreme
June Weather25°C (78°F)119 mm (4.7 inches)77%extreme
July Weather27°C (80°F)100 mm (3.9 inches)77%extreme
August Weather26°C (80°F)117 mm (4.6 inches)72%extreme
September Weather25°C (77°F)98 mm (3.8 inches)73%very high
October Weather20°C (68°F)108 mm (4.2 inches)73%very high
November Weather12°C (54°F)83 mm (3.3 inches)85%high
December Weather10°C (50°F)138 mm (5.5 inches)88%moderate

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