September Weather in Sonsonate, El Salvador

Last updated: August 23, 2025

In September, the average temperature in Sonsonate, El Salvador hovers around 25°C (77°F), providing a warm atmosphere for visitors. Temperatures can range from a cozy 21°C (70°F) to a balmy 31°C (88°F). However, be prepared for some wet weather, as the region experiences an average precipitation of 391 mm (15.4 in) over the course of 30 days. With an average humidity level of 77%, it’s a perfect time to enjoy the lush surroundings while staying hydrated!

September Temperature in Sonsonate

In September in Sonsonate, the average temperature is 25°C (77°F). Maximums can reach 31°C (88°F), while minimums can be as low as 21°C (70°F). This mild and comfortable weather makes Sonsonate an ideal destination for travelers seeking pleasant conditions during their visit.

September Weather in Sonsonate: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Sonsonate, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sonsonate, September typically has an average temperature of 25°C (77°F), with highs reaching up to 31°C (88°F) and lows dropping to around 21°C (70°F).

Data source: Temperature data for Sonsonate generated using information from the Copernicus Climate Change Service.

September Precipitation in Sonsonate

In Sonsonate in September, the total precipitation amount is 391 mm (15.4 in) accumulated over a period of 30 days.

September Precipitation Trends in Sonsonate

The chart displays monthly precipitation patterns in Sonsonate, 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 Sonsonate, September typically receives around 391 mm (15.4 inches) of precipitation spread over approximately 30 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Sonsonate

In Sonsonate in September, humidity is 77%. With an average temperature of 25°C (77°F), this humidity feels like a warm blanket wrapping around you, making travel feel slightly heavy but still pleasant, as long as you stay hydrated and take frequent breaks in the shade.

September Average Humidity in Sonsonate

This chart illustrates the average monthly humidity levels in Sonsonate, 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 Sonsonate is approximately 77%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sonsonate

In Sonsonate 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 Sonsonate.

Maximum UV Index Levels in Sonsonate for September

The chart shows the monthly maximum UV Index (UVI) for Sonsonate 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 Sonsonate typically reaches 13, which falls under the extreme exposure category.

Data source: Sonsonate 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 Sonsonate Compares to Other Months

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

This table compares monthly weather conditions in Sonsonate, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	24°C (76°F)	7 mm (0.3 inches)	63%	extreme
February Weather	25°C (77°F)	7 mm (0.3 inches)	62%	extreme
March Weather	26°C (79°F)	14 mm (0.6 inches)	59%	extreme
April Weather	26°C (79°F)	70 mm (2.8 inches)	59%	extreme
May Weather	26°C (79°F)	310 mm (12.2 inches)	59%	extreme
June Weather	25°C (78°F)	370 mm (14.6 inches)	68%	extreme
July Weather	26°C (79°F)	208 mm (8.2 inches)	77%	extreme
August Weather	25°C (78°F)	331 mm (13.0 inches)	79%	extreme
September Weather	25°C (77°F)	391 mm (15.4 inches)	77%	extreme
October Weather	25°C (77°F)	389 mm (15.3 inches)	77%	extreme
November Weather	25°C (77°F)	73 mm (2.9 inches)	75%	very high
December Weather	25°C (76°F)	11 mm (0.4 inches)	66%	very high