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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 pleasant 23°C (73°F). However, it can vary significantly, with minimums dipping to 8°C (46°F) and maximums soaring up to 36°C (97°F). Prepare for some wet days as precipitation averages 129 mm (5.1 in) over about 10 days, and expect humidity levels to hover around a comfortable 71%.

September Temperature in Lafayette

In September in Lafayette, the average temperature is 23°C (73°F), with maximums reaching up to 36°C (97°F) and minimums dropping as low as 8°C (46°F). This is an ideal time for travelers to enjoy a variety of outdoor activities while being prepared for fluctuating temperatures.

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 23°C (73°F), with highs reaching up to 36°C (97°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec404552586976797773634844
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 129 mm (5.1 in) over a span of 10 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 129 mm (5.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec11019716515513016413213412915092154
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 71%. With an average temperature of 23°C (73°F), this humidity feels like a warm, sticky embrace, making outdoor exploration slightly uncomfortable but still manageable if you stay hydrated and plan for breaks in shaded areas.

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 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%82%83%83%80%74%71%78%88%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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
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 Weather4°C (40°F)110 mm (4.3 inches)87%moderate
February Weather7°C (45°F)197 mm (7.7 inches)86%high
March Weather11°C (52°F)165 mm (6.5 inches)86%high
April Weather15°C (59°F)154 mm (6.1 inches)82%very high
May Weather21°C (70°F)130 mm (5.1 inches)82%very high
June Weather24°C (76°F)164 mm (6.5 inches)83%extreme
July Weather26°C (80°F)132 mm (5.2 inches)80%extreme
August Weather25°C (78°F)134 mm (5.3 inches)74%very high
September Weather23°C (73°F)129 mm (5.1 inches)71%very high
October Weather17°C (63°F)150 mm (5.9 inches)78%high
November Weather9°C (48°F)92 mm (3.6 inches)88%moderate
December Weather7°C (45°F)154 mm (6.1 inches)88%moderate

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