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September Weather in San Antonio, Peru

Last updated: August 27, 2025

In September, the average temperature in San Antonio, Peru is a comfortable 18°C (65°F). Expect a minimum of 11°C (52°F) and a pleasant maximum of 27°C (80°F). With 0 mm (0.0 in) of precipitation over 0 days, the weather is perfect for outdoor activities. Additionally, the average humidity sits at a refreshing 58%. Enjoy the delightful climate!

September Temperature in San Antonio

In September in San Antonio, the average temperature is 18°C (65°F), with maximums reaching 27°C (80°F) and minimums dropping to as low as 11°C (52°F). This comfortable climate makes San Antonio an ideal destination for outdoor adventures and sightseeing.

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 18°C (65°F), with highs reaching up to 27°C (80°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec646464646463636464656464
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 0 mm (0.0 in) during 0 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 0 mm (0.0 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec8389578001001413
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 58%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, creating a comfortable yet slightly muggy atmosphere perfect for leisurely exploration.

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 58%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%90%91%88%76%61%57%59%75%84%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec16161514119101214161716
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 Weather18°C (64°F)83 mm (3.3 inches)89%extreme
February Weather18°C (64°F)89 mm (3.5 inches)90%extreme
March Weather18°C (64°F)57 mm (2.3 inches)90%extreme
April Weather18°C (65°F)8 mm (0.3 inches)91%extreme
May Weather18°C (65°F)0 mm (0.0 inches)88%extreme
June Weather17°C (63°F)0 mm (0.0 inches)76%very high
July Weather17°C (63°F)1 mm (0.0 inches)61%very high
August Weather18°C (64°F)0 mm (0.0 inches)57%extreme
September Weather18°C (65°F)0 mm (0.0 inches)58%extreme
October Weather18°C (65°F)1 mm (0.0 inches)75%extreme
November Weather18°C (64°F)4 mm (0.1 inches)83%extreme
December Weather18°C (65°F)13 mm (0.5 inches)84%extreme

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