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September Weather in San Antonio la Portilla, Mexico

Last updated: August 27, 2025

In September, the average temperature in San Antonio la Portilla, Mexico is a pleasant 19°C (66°F), with a minimum of 9°C (49°F) and a maximum reaching 28°C (83°F). Expect a fair amount of rain, with 231 mm (9.1 in) of precipitation over 21 days. The weather is quite humid, boasting an average humidity level of 82%.

September Temperature in San Antonio la Portilla

In September in San Antonio la Portilla, the average temperature is 19°C (66°F), with maximums reaching up to 28°C (83°F) and minimums dropping as low as 9°C (49°F). It's a great time to explore the outdoors while enjoying mild weather, so pack accordingly for both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in San Antonio la Portilla, 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 la Portilla, September typically has an average temperature of 19°C (66°F), with highs reaching up to 28°C (83°F) and lows dropping to around 9°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec596265686866666665656260
Data source: Temperature data for San Antonio la Portilla 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 San Antonio la Portilla

In San Antonio la Portilla in September, the total precipitation amount is 231 mm (9.1 in), occurring over the course of 21 days.

September Precipitation Trends in San Antonio la Portilla

The chart displays monthly precipitation patterns in San Antonio la Portilla, 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 la Portilla, September typically receives around 231 mm (9.1 inches) of precipitation spread over approximately 21 days.
JanFebMarAprMayJunJulAugSepOctNovDec33133710320911315323185162
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Antonio la Portilla

In San Antonio la Portilla in September humidity is 82%. With an average temperature of 19°C (66°F), this humidity feels like a warm blanket wrapping around you, making it slightly uncomfortable for traveling as you might find yourself constantly seeking shade or a cool breeze.

September Average Humidity in San Antonio la Portilla

This chart illustrates the average monthly humidity levels in San Antonio la Portilla, 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 la Portilla is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%78%75%71%77%76%68%70%82%91%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Antonio la Portilla

In San Antonio la Portilla 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 la Portilla, you can check here.

Maximum UV Index Levels in San Antonio la Portilla for September

The chart shows the monthly maximum UV Index (UVI) for San Antonio la Portilla 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 la Portilla typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10121415151515141412109
Data source: San Antonio la Portilla 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 la Portilla Compares to Other Months

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

This table compares monthly weather conditions in San Antonio la Portilla, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather15°C (59°F)3 mm (0.1 inches)84%very high
February Weather17°C (62°F)3 mm (0.1 inches)78%extreme
March Weather18°C (65°F)13 mm (0.5 inches)75%extreme
April Weather20°C (68°F)37 mm (1.4 inches)70%extreme
May Weather20°C (68°F)103 mm (4.1 inches)77%extreme
June Weather19°C (66°F)209 mm (8.2 inches)76%extreme
July Weather19°C (66°F)113 mm (4.4 inches)68%extreme
August Weather19°C (67°F)153 mm (6.0 inches)70%extreme
September Weather19°C (66°F)231 mm (9.1 inches)82%extreme
October Weather18°C (65°F)85 mm (3.3 inches)91%extreme
November Weather17°C (63°F)16 mm (0.6 inches)89%very high
December Weather15°C (60°F)2 mm (0.1 inches)88%very high

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