nomadseason

September Weather in Lafayette, United States

Last updated: June 24, 2025

In September, the average temperature in Lafayette, United States hovers around 19°C (66°F). Expect a range from a brisk -1°C (31°F) to a sweltering 37°C (98°F). With approximately 28 mm (1.1 in) of precipitation spread over 5 days, you might want to pack an umbrella! Additionally, the average humidity is around 65%, making for a pleasantly comfortable atmosphere.

September Temperature in Lafayette

In September in Lafayette, the average temperature is 19°C (66°F). Maximums can reach 37°C (98°F), while minimums can be as low as -1°C (31°F). This wide range makes Lafayette an ideal destination for travelers seeking both warm and cool weather experiences.

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 19°C (66°F), with highs reaching up to 37°C (98°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec302940485669747266494033
Data source: Temperature data for Lafayette generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
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 28 mm (1.1 in) over a period of 5 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 28 mm (1.1 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec2127555610946354128372414
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Lafayette

In Lafayette in September humidity is 65%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, making outdoor activities refreshing but slightly sticky, so it's advisable to stay hydrated and take breaks in shaded areas while exploring.

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 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%81%76%67%58%52%56%65%76%82%89%
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.
JanFebMarAprMayJunJulAugSepOctNovDec469111112121110754
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 Weather-1°C (30°F)21 mm (0.8 inches)88%moderate
February Weather-2°C (30°F)27 mm (1.1 inches)87%high
March Weather4°C (40°F)55 mm (2.2 inches)81%very high
April Weather9°C (48°F)56 mm (2.2 inches)76%extreme
May Weather13°C (56°F)109 mm (4.3 inches)66%extreme
June Weather20°C (69°F)46 mm (1.8 inches)58%extreme
July Weather23°C (74°F)35 mm (1.4 inches)52%extreme
August Weather22°C (73°F)41 mm (1.6 inches)56%extreme
September Weather19°C (66°F)28 mm (1.1 inches)65%very high
October Weather9°C (49°F)37 mm (1.5 inches)76%high
November Weather5°C (40°F)24 mm (0.9 inches)82%moderate
December Weather0°C (33°F)14 mm (0.6 inches)89%moderate

Compare Lafayette's Climate with Cities Worldwide