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September Weather in San Antonio, Argentina

Last updated: August 22, 2025

In September, the average temperature in San Antonio, Argentina hovers around 15°C (60°F). Expect a range from a cool 0°C (33°F) to a warm 33°C (91°F). With an average precipitation of 85 mm (3.4 in) over 13 days, you might want to keep an umbrella handy. The air feels relatively comfortable with an average humidity of 57%.

September Temperature in San Antonio

In September in San Antonio, the average temperature is 15°C (60°F). The maximum can reach 33°C (91°F), while the minimum can drop as low as 0°C (33°F). This makes it an ideal time for travelers to enjoy a variety of outdoor activities, but it's wise to pack for both warm days and chilly nights.

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

The chart illustrates September temperature patterns in San Antonio, 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, September typically has an average temperature of 15°C (60°F), with highs reaching up to 33°C (91°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec696764615552515459646668
Data source: Temperature data for San Antonio 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

In San Antonio in September, the total precipitation amount is 85 mm (3.4 in), which occurs over the span of 13 days.

September Precipitation Trends in San Antonio

The chart displays monthly precipitation patterns in San Antonio, 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, September typically receives around 85 mm (3.4 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec22323728226715555455285201241272
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Antonio

In San Antonio in September, humidity is 57%. With an average temperature of 15°C (60°F), this humidity feels like a comfortable embrace that enhances the refreshing experience for traveling, making it an ideal time to explore the sights without feeling overheated.

September Average Humidity in San Antonio

This chart illustrates the average monthly humidity levels in San Antonio, 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 is approximately 57%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%87%88%85%74%56%47%44%57%55%70%77%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Antonio

In San Antonio in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in San Antonio.

Maximum UV Index Levels in San Antonio for September

The chart shows the monthly maximum UV Index (UVI) for San Antonio 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 typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec16151411867911141616
Data source: San Antonio 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 Compares to Other Months

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

This table compares monthly weather conditions in San Antonio, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather21°C (69°F)223 mm (8.8 inches)84%extreme
February Weather19°C (67°F)237 mm (9.3 inches)87%extreme
March Weather18°C (65°F)282 mm (11.1 inches)88%extreme
April Weather16°C (61°F)267 mm (10.5 inches)85%extreme
May Weather13°C (56°F)155 mm (6.1 inches)74%very high
June Weather11°C (52°F)55 mm (2.2 inches)56%high
July Weather11°C (52°F)45 mm (1.8 inches)47%high
August Weather12°C (55°F)52 mm (2.1 inches)44%very high
September Weather15°C (60°F)85 mm (3.4 inches)57%extreme
October Weather18°C (64°F)201 mm (7.9 inches)55%extreme
November Weather19°C (66°F)241 mm (9.5 inches)70%extreme
December Weather20°C (68°F)272 mm (10.7 inches)77%extreme

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