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September Weather in San Salvador, Peru

Last updated: August 27, 2025

In San Salvador, Peru, the average temperature in September hovers around 8°C (46°F). Expect a minimum dip to -3°C (27°F) and a pleasant maximum of 19°C (66°F). Throughout the month, 90 mm (3.5 in) of precipitation is likely, spread over approximately 22 days, with average humidity sitting at a comfortable 51%.

September Temperature in San Salvador

In September in San Salvador, the average temperature is 8°C (46°F). The maximum can reach 19°C (66°F) and the minimum can be as low as -3°C (27°F). Travelers should be prepared for a range of temperatures and pack accordingly for both warm days and chilly nights.

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

The chart illustrates September temperature patterns in San Salvador, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Salvador, September typically has an average temperature of 8°C (46°F), with highs reaching up to 19°C (66°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec484848474645444546484949
Data source: Temperature data for San Salvador 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 Salvador

In San Salvador in September, the precipitation amount is 90 mm (3.5 in) spread over 22 days.

September Precipitation Trends in San Salvador

The chart displays monthly precipitation patterns in San Salvador, 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 Salvador, September typically receives around 90 mm (3.5 inches) of precipitation spread over approximately 22 days.
JanFebMarAprMayJunJulAugSepOctNovDec1902662031307363506590127156254
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Salvador

In San Salvador in September humidity is 51%. With an average temperature of 8°C (46°F), this humidity feels like a crisp dampness that can make the air feel cooler than it actually is, creating a refreshing yet slightly chill atmosphere for traveling.

September Average Humidity in San Salvador

This chart illustrates the average monthly humidity levels in San Salvador, 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 Salvador is approximately 51%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec94%92%92%90%88%77%55%44%51%64%84%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Salvador

In San Salvador in September, the maximum UV index reaches an alarming 17, which falls under the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to stay protected. For more details on the hourly UV index in San Salvador, you can check Hourly UV Index in San Salvador.

Maximum UV Index Levels in San Salvador for September

The chart shows the monthly maximum UV Index (UVI) for San Salvador 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 Salvador typically reaches 17, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec221919171411131417182220
Data source: San Salvador 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 Salvador Compares to Other Months

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

This table compares monthly weather conditions in San Salvador, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)189 mm (7.5 inches)94%extreme
February Weather9°C (48°F)266 mm (10.5 inches)92%extreme
March Weather9°C (48°F)203 mm (8.0 inches)92%extreme
April Weather8°C (47°F)129 mm (5.1 inches)90%extreme
May Weather8°C (46°F)73 mm (2.9 inches)88%extreme
June Weather7°C (45°F)63 mm (2.5 inches)77%extreme
July Weather7°C (44°F)50 mm (2.0 inches)55%extreme
August Weather7°C (45°F)65 mm (2.6 inches)44%extreme
September Weather8°C (46°F)90 mm (3.5 inches)51%extreme
October Weather9°C (48°F)127 mm (5.0 inches)64%extreme
November Weather10°C (49°F)156 mm (6.1 inches)84%extreme
December Weather9°C (49°F)254 mm (10.0 inches)93%extreme

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