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September Weather in Les Cayes, Haiti

Last updated: August 23, 2025

The average temperature in Les Cayes, Haiti during September is a warm 27°C (80°F). Expect minimums around 24°C (75°F) and maximums soaring to 31°C (87°F). However, be prepared for some rain, as precipitation averages 109 mm (4.3 in) over 19 days. With an average humidity of 76%, it's wise to stay hydrated and cool!

September Temperature in Les Cayes

In September in Les Cayes, the average temperature is 27°C (80°F). Maximums can reach 31°C (87°F) and minimums can be as low as 24°C (75°F). This makes it an ideal time for travelers looking to enjoy warm and pleasant weather.

September Weather in Les Cayes: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Les Cayes, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Les Cayes, September typically has an average temperature of 27°C (80°F), with highs reaching up to 31°C (87°F) and lows dropping to around 24°C (75°F).
JanFebMarAprMayJunJulAugSepOctNovDec757676777880818180797877
Data source: Temperature data for Les Cayes 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 Les Cayes

In Les Cayes in September, the precipitation amount is 109 mm (4.3 in) over the course of 19 days.

September Precipitation Trends in Les Cayes

The chart displays monthly precipitation patterns in Les Cayes, 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 Les Cayes, September typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec322758787844609910913411328
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Les Cayes

In Les Cayes in September, humidity is 76%. With an average temperature of 27°C (80°F), this humidity feels like a warm blanket enveloping you, making outdoor activities and travel a bit challenging as you navigate the sticky air and sweat-drenched clothing.

September Average Humidity in Les Cayes

This chart illustrates the average monthly humidity levels in Les Cayes, 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 Les Cayes is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec65%63%62%62%60%62%70%76%76%76%76%71%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Les Cayes

In Les Cayes in September, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Les Cayes.

Maximum UV Index Levels in Les Cayes for September

The chart shows the monthly maximum UV Index (UVI) for Les Cayes 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 Les Cayes typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec911131413131313121198
Data source: Les Cayes 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 Les Cayes Compares to Other Months

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

This table compares monthly weather conditions in Les Cayes, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (76°F)32 mm (1.3 inches)65%very high
February Weather24°C (76°F)27 mm (1.1 inches)63%extreme
March Weather24°C (76°F)58 mm (2.3 inches)62%extreme
April Weather25°C (77°F)78 mm (3.1 inches)62%extreme
May Weather26°C (79°F)78 mm (3.1 inches)60%extreme
June Weather27°C (80°F)44 mm (1.7 inches)61%extreme
July Weather27°C (81°F)60 mm (2.4 inches)70%extreme
August Weather27°C (81°F)99 mm (3.9 inches)76%extreme
September Weather27°C (80°F)109 mm (4.3 inches)76%extreme
October Weather26°C (79°F)134 mm (5.3 inches)76%extreme
November Weather25°C (78°F)113 mm (4.5 inches)76%very high
December Weather25°C (77°F)28 mm (1.1 inches)71%very high

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