September Weather in Casahuatlan, Mexico

Last updated: August 27, 2025

In September, the average temperature in Casahuatlan, Mexico hovers around 22°C (73°F), providing a pleasant climate for visitors. Expect minimums of 16°C (62°F) and maximums that can soar up to 31°C (87°F). However, be prepared for some rain, as the area experiences about 314 mm (12.4 in) of precipitation over 28 days, accompanied by an average humidity of 82%.

September Temperature in Casahuatlan

In September in Casahuatlan, the average temperature is 22°C (73°F), with maximums reaching up to 31°C (87°F) and minimums as low as 16°C (62°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

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

The chart illustrates September temperature patterns in Casahuatlan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Casahuatlan, September typically has an average temperature of 22°C (73°F), with highs reaching up to 31°C (87°F) and lows dropping to around 16°C (62°F).

Data source: Temperature data for Casahuatlan generated using information from the Copernicus Climate Change Service.

September Precipitation in Casahuatlan

In Casahuatlan in September, the total precipitation amount reaches 314 mm (12.4 in) over the course of 28 days.

September Precipitation Trends in Casahuatlan

The chart displays monthly precipitation patterns in Casahuatlan, 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 Casahuatlan, September typically receives around 314 mm (12.4 inches) of precipitation spread over approximately 28 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Casahuatlan

In Casahuatlan in September, humidity is 82%. With an average temperature of 22°C (73°F), this humidity feels like a warm, heavy embrace, making traveling feel sticky and draining, but the tropical atmosphere also brings a lush vibrancy to the surroundings.

September Average Humidity in Casahuatlan

This chart illustrates the average monthly humidity levels in Casahuatlan, 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 Casahuatlan is approximately 82%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Casahuatlan

In Casahuatlan in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Casahuatlan, you can check here.

Maximum UV Index Levels in Casahuatlan for September

The chart shows the monthly maximum UV Index (UVI) for Casahuatlan 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 Casahuatlan typically reaches 14, which falls under the extreme exposure category.

Data source: Casahuatlan 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 Casahuatlan Compares to Other Months

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

This table compares monthly weather conditions in Casahuatlan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	21°C (69°F)	2 mm (0.1 inches)	84%	very high
February Weather	23°C (73°F)	4 mm (0.2 inches)	78%	extreme
March Weather	25°C (77°F)	5 mm (0.2 inches)	75%	extreme
April Weather	26°C (80°F)	12 mm (0.5 inches)	70%	extreme
May Weather	26°C (80°F)	88 mm (3.5 inches)	77%	extreme
June Weather	23°C (74°F)	309 mm (12.2 inches)	76%	extreme
July Weather	23°C (74°F)	257 mm (10.1 inches)	68%	extreme
August Weather	23°C (73°F)	338 mm (13.3 inches)	70%	extreme
September Weather	22°C (73°F)	314 mm (12.4 inches)	82%	extreme
October Weather	23°C (73°F)	164 mm (6.5 inches)	91%	extreme
November Weather	21°C (71°F)	40 mm (1.6 inches)	89%	very high
December Weather	20°C (69°F)	3 mm (0.1 inches)	88%	very high