September Weather in Mexico, United States

Last updated: June 24, 2025

In September, the average temperature in Mexico, United States hovers around 20°C (69°F). Expect a range from a chilly 4°C (40°F) to a warm 33°C (92°F). With precipitation totaling 65 mm (2.6 in) over 8 days, you'll want to be prepared for some wet weather. The average humidity is a comfortable 78%, making for a refreshing atmosphere.

September Temperature in Mexico

In September in Mexico, the average temperature is 20°C (69°F). Maximums can reach 33°C (92°F), while minimums can drop as low as 4°C (40°F). This varied climate makes Mexico an ideal destination for travelers seeking both warmth and cooler experiences.

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

The chart illustrates September temperature patterns in Mexico, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mexico, September typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (40°F).

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

September Precipitation in Mexico

In Mexico in September, the total precipitation amount is 65 mm (2.6 in) spread over the course of 8 days.

September Precipitation Trends in Mexico

The chart displays monthly precipitation patterns in Mexico, 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 Mexico, September typically receives around 65 mm (2.6 inches) of precipitation spread over approximately 8 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 Mexico

In Mexico in September, humidity is 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.

September Average Humidity in Mexico

This chart illustrates the average monthly humidity levels in Mexico, 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 Mexico is approximately 78%, 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 Mexico

In Mexico in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Mexico.

Maximum UV Index Levels in Mexico for September

The chart shows the monthly maximum UV Index (UVI) for Mexico 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 Mexico typically reaches 8, which falls under the very high exposure category.

Data source: Mexico 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 Mexico Compares to Other Months

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

This table compares monthly weather conditions in Mexico, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	76 mm (3.0 inches)	85%	moderate
February Weather	-1°C (31°F)	81 mm (3.2 inches)	85%	moderate
March Weather	5°C (41°F)	103 mm (4.0 inches)	86%	high
April Weather	10°C (51°F)	93 mm (3.7 inches)	87%	very high
May Weather	17°C (63°F)	151 mm (5.9 inches)	81%	very high
June Weather	23°C (73°F)	107 mm (4.2 inches)	82%	very high
July Weather	24°C (76°F)	105 mm (4.2 inches)	81%	very high
August Weather	23°C (73°F)	107 mm (4.2 inches)	79%	very high
September Weather	20°C (69°F)	65 mm (2.6 inches)	78%	very high
October Weather	14°C (57°F)	102 mm (4.0 inches)	81%	high
November Weather	5°C (41°F)	81 mm (3.2 inches)	89%	moderate
December Weather	2°C (35°F)	67 mm (2.6 inches)	86%	low