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September Weather in El Rosario, El Salvador

Last updated: August 23, 2025

In September, the average temperature in El Rosario, El Salvador hovers around 26°C (79°F), with a minimum of 23°C (73°F) and a maximum reaching 31°C (88°F). Expect a total precipitation of 290 mm (11.4 in) spread over 28 days, contributing to a notably high average humidity of 77%. Prepare for a warm and wet month!

September Temperature in El Rosario

In September in El Rosario, the average temperature is 26°C (79°F). Maximums can reach 31°C (88°F), while minimums can be as low as 23°C (73°F). This pleasant weather makes El Rosario an ideal destination for travelers seeking warmth and comfort during their visit.

September Weather in El Rosario: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in El Rosario, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In El Rosario, September typically has an average temperature of 26°C (79°F), with highs reaching up to 31°C (88°F) and lows dropping to around 23°C (73°F).
JanFebMarAprMayJunJulAugSepOctNovDec798081818079818079787979
Data source: Temperature data for El Rosario 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 El Rosario

In El Rosario in September, the precipitation amount is 290 mm (11.4 in) during a span of 28 days.

September Precipitation Trends in El Rosario

The chart displays monthly precipitation patterns in El Rosario, 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 El Rosario, September typically receives around 290 mm (11.4 inches) of precipitation spread over approximately 28 days.
JanFebMarAprMayJunJulAugSepOctNovDec35745287316145256290349747
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in El Rosario

In El Rosario in September humidity is 77%. With an average temperature of 26°C (79°F), this humidity feels like walking through a warm, thick fog that clings to your skin, making every step feel heavier and more exhausting while exploring the sights.

September Average Humidity in El Rosario

This chart illustrates the average monthly humidity levels in El Rosario, 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 El Rosario is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec63%62%59%59%59%68%78%79%77%77%75%67%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in El Rosario

In El Rosario 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 El Rosario.

Maximum UV Index Levels in El Rosario for September

The chart shows the monthly maximum UV Index (UVI) for El Rosario 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 El Rosario typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec11121414141413131313109
Data source: El Rosario 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 El Rosario Compares to Other Months

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

This table compares monthly weather conditions in El Rosario, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (79°F)3 mm (0.1 inches)63%extreme
February Weather26°C (80°F)5 mm (0.2 inches)62%extreme
March Weather27°C (81°F)7 mm (0.3 inches)59%extreme
April Weather27°C (81°F)45 mm (1.8 inches)59%extreme
May Weather27°C (80°F)287 mm (11.3 inches)59%extreme
June Weather26°C (80°F)316 mm (12.4 inches)68%extreme
July Weather27°C (81°F)145 mm (5.7 inches)77%extreme
August Weather27°C (80°F)256 mm (10.1 inches)79%extreme
September Weather26°C (79°F)290 mm (11.4 inches)77%extreme
October Weather26°C (79°F)349 mm (13.7 inches)77%extreme
November Weather26°C (79°F)74 mm (2.9 inches)75%very high
December Weather26°C (79°F)7 mm (0.3 inches)66%very high

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