September Weather in San Antonio Primero, Mexico

Last updated: August 27, 2025

In September, the average temperature in San Antonio Primero, Mexico hovers around 18°C (65°F), with a minimum reach of 9°C (48°F) and a maximum soaring up to 29°C (84°F). Expect 151 mm (5.9 in) of precipitation over 17 days, contributing to an average humidity of 81%. Be prepared for a mix of warmth and moisture as you explore!

September Temperature in San Antonio Primero

In September in San Antonio Primero, the average temperature is 18°C (65°F). Maximums can reach 29°C (84°F), while minimums can drop to as low as 9°C (48°F). This makes it an ideal time for travelers to enjoy comfortable weather while exploring the area's attractions.

September Weather in San Antonio Primero: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in San Antonio Primero, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Antonio Primero, September typically has an average temperature of 18°C (65°F), with highs reaching up to 29°C (84°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in San Antonio Primero

In San Antonio Primero in September, the precipitation amount is 151 mm (5.9 in) over a span of 17 days.

September Precipitation Trends in San Antonio Primero

The chart displays monthly precipitation patterns in San Antonio Primero, 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 San Antonio Primero, September typically receives around 151 mm (5.9 inches) of precipitation spread over approximately 17 days.

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

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Millimeters (mm) Inches (in)

September Humidity in San Antonio Primero

In San Antonio Primero in September, humidity is 81%. With an average temperature of 18°C (65°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier and the air thick and sultry—a challenging environment for traveling.

September Average Humidity in San Antonio Primero

This chart illustrates the average monthly humidity levels in San Antonio Primero, 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 San Antonio Primero is approximately 81%, 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 San Antonio Primero

In San Antonio Primero 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 San Antonio Primero, you can check here.

Maximum UV Index Levels in San Antonio Primero for September

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

Data source: San Antonio Primero 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 San Antonio Primero Compares to Other Months

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

This table compares monthly weather conditions in San Antonio Primero, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	14°C (57°F)	4 mm (0.1 inches)	74%	very high
February Weather	16°C (61°F)	6 mm (0.2 inches)	65%	extreme
March Weather	18°C (65°F)	10 mm (0.4 inches)	58%	extreme
April Weather	20°C (69°F)	12 mm (0.5 inches)	58%	extreme
May Weather	21°C (71°F)	48 mm (1.9 inches)	67%	extreme
June Weather	20°C (68°F)	174 mm (6.9 inches)	76%	extreme
July Weather	19°C (66°F)	131 mm (5.2 inches)	67%	extreme
August Weather	19°C (67°F)	109 mm (4.3 inches)	68%	extreme
September Weather	18°C (65°F)	151 mm (5.9 inches)	81%	extreme
October Weather	17°C (63°F)	58 mm (2.3 inches)	83%	extreme
November Weather	15°C (59°F)	18 mm (0.7 inches)	84%	very high
December Weather	14°C (57°F)	4 mm (0.2 inches)	81%	very high