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September Weather in San Antonio, Peru

Last updated: August 27, 2025

In September, the average temperature in San Antonio, Peru hovers around 26°C (80°F), with the minimum dipping to 22°C (71°F) and a maximum soaring to 35°C (95°F). Visitors can expect heavy precipitation, averaging 170 mm (6.7 in) over about 24 days, alongside a comfortable average humidity of 55%.

September Temperature in San Antonio

In September in San Antonio, the average temperature is 26°C (80°F). The maximum can reach 35°C (95°F), while the minimum can drop as low as 22°C (71°F). This pleasant climate makes San Antonio an ideal destination for travelers seeking warmth and sunshine during their visit.

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 26°C (80°F), with highs reaching up to 35°C (95°F) and lows dropping to around 22°C (71°F).
JanFebMarAprMayJunJulAugSepOctNovDec797979797878777979797979
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 precipitation amount is 170 mm (6.7 in) over the course of 24 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 170 mm (6.7 inches) of precipitation spread over approximately 24 days.
JanFebMarAprMayJunJulAugSepOctNovDec275279322322242184149120170202239320
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 55%. With an average temperature of 26°C (80°F), this humidity feels like a warm embrace, making traveling a bit sticky but still comfortable, as long as you stay hydrated and take breaks in the shade.

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 55%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%79%82%85%91%85%74%59%55%57%74%87%
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 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, you can check here.

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 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151617161312111214141313
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 Weather26°C (79°F)275 mm (10.8 inches)83%extreme
February Weather26°C (79°F)278 mm (11.0 inches)78%extreme
March Weather26°C (79°F)322 mm (12.7 inches)82%extreme
April Weather26°C (79°F)322 mm (12.7 inches)85%extreme
May Weather26°C (79°F)242 mm (9.5 inches)91%extreme
June Weather26°C (78°F)184 mm (7.2 inches)85%extreme
July Weather25°C (78°F)149 mm (5.9 inches)74%extreme
August Weather26°C (79°F)120 mm (4.7 inches)59%extreme
September Weather26°C (80°F)170 mm (6.7 inches)55%extreme
October Weather26°C (80°F)202 mm (8.0 inches)57%extreme
November Weather26°C (80°F)239 mm (9.4 inches)74%extreme
December Weather26°C (79°F)320 mm (12.6 inches)87%extreme

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