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September Weather in San Antonio, Panama

Last updated: August 27, 2025

In September, the average temperature in San Antonio, Panama is a warm 26°C (80°F), with minimums dipping to 23°C (73°F) and maximums reaching up to 33°C (92°F). Expect significant rainfall, as 314 mm (12.4 in) of precipitation typically falls over 29 days, contributing to an average humidity of 78%. Get ready for a tropical experience!

September Temperature in San Antonio

In September in San Antonio, the average temperature is 26°C (80°F). Maximums can reach 33°C (92°F), while minimums can drop to as low as 23°C (73°F). This climate makes San Antonio an ideal destination for travelers seeking warm and pleasant weather.

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 33°C (92°F) and lows dropping to around 23°C (73°F).
JanFebMarAprMayJunJulAugSepOctNovDec808283838180808079797980
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 314 mm (12.4 in) during a span of 29 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 314 mm (12.4 inches) of precipitation spread over approximately 29 days.
JanFebMarAprMayJunJulAugSepOctNovDec29987929530329027531434428095
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 78%. With an average temperature of 26°C (80°F), this humidity feels like a warm blanket wrapping around you, making travel feel sticky and heavy, while the air clings to your skin and encourages frequent breaks in shaded spots to stay cool.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%76%74%76%78%83%80%79%78%77%79%79%
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 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, 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 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec121314151513131313131210
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 Weather27°C (80°F)29 mm (1.1 inches)76%extreme
February Weather28°C (82°F)9 mm (0.4 inches)75%extreme
March Weather28°C (83°F)8 mm (0.3 inches)74%extreme
April Weather28°C (83°F)79 mm (3.1 inches)76%extreme
May Weather27°C (81°F)295 mm (11.6 inches)78%extreme
June Weather27°C (80°F)303 mm (11.9 inches)83%extreme
July Weather27°C (80°F)290 mm (11.4 inches)79%extreme
August Weather27°C (80°F)275 mm (10.8 inches)79%extreme
September Weather26°C (80°F)314 mm (12.4 inches)78%extreme
October Weather26°C (79°F)343 mm (13.5 inches)77%extreme
November Weather26°C (79°F)280 mm (11.0 inches)79%extreme
December Weather27°C (80°F)95 mm (3.7 inches)79%very high

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