September Weather in Ilopango, El Salvador

Last updated: August 21, 2025

September in Ilopango, El Salvador, presents a dynamic blend of tropical climate characteristics. With maximum temperatures reaching up to 34°C (94°F) and a comfortable average of 26°C (79°F), the warm weather is often accompanied by a lush, humid atmosphere, as indicated by the 77% humidity. However, this month also sees a significant amount of rainfall, totaling 291 mm (11.5 in) over a staggering 28 days, making it one of the rainiest periods of the year. Whether you're drawn to the vibrant greenery or the refreshing showers, Ilopango in September offers a unique experience for visitors and locals alike.

September Temperature in Ilopango

In September, Ilopango, El Salvador experiences a slight shift in temperatures, embracing the tail end of the dry season with a minimum of 20°C (69°F) and a maximum of 34°C (94°F). The average temperature dips marginally to 26°C (79°F), offering a comfortable climate that is perfect for both exploration and relaxation. As the month progresses, you'll notice the region's heat softening from the peaks of summer, but it still maintains a warmth that invites outdoor activities. With September's temperatures slightly cooler than August's consistent highs, it's an ideal time for visitors to enjoy the vibrant landscapes of El Salvador without the sweltering heat of the preceding months.

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

The chart illustrates September temperature patterns in Ilopango, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ilopango, September typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec788081828079818079787878
Data source: Temperature data for Ilopango 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 Ilopango

September in Ilopango, El Salvador, marks a climactic point in the rainy season, showcasing a substantial precipitation total of 291 mm (11.5 in). This significant rainfall is accompanied by 28 wet days, making it one of the rainiest months of the year. Following the patterns established from May through August, September continues the trend of heavy rains, consistently showcasing the region’s shift from drier conditions to a lush, verdant landscape. With each passing month, the precipitation steadily increases, peaking as the rainy season approaches its zenith, only to taper off in the following months. This robust precipitation not only underscores the tropical climate of Ilopango but also emphasizes the vital role of September in replenishing local water sources and sustaining the region's biodiversity.

September Precipitation Trends in Ilopango

The chart displays monthly precipitation patterns in Ilopango, 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 Ilopango, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec35551280313138232291286657
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Ilopango

In September, Ilopango, El Salvador experiences a notable shift in humidity levels, with an average of 77%, mirroring the slightly elevated conditions of August. This marks a continuation of the region's trend of increasing humidity from mid-year, with levels peaking in July and remaining consistently high into fall. The gradual rise from a more temperate 59% in March through May highlights a shift toward the wetter months, typical for this tropical climate. As October follows closely behind with equal humidity, September serves as a reminder of the lush, vibrant atmosphere that characterizes this time of year, where warmth and moisture intermingle, setting the stage for the rich biodiversity of the region.

September Average Humidity in Ilopango

This chart illustrates the average monthly humidity levels in Ilopango, 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 Ilopango is approximately {2}%, 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 Ilopango

As September rolls into Ilopango, El Salvador, residents and visitors can expect a consistent UV Index of 13, which classifies as extreme. This trend of high UV levels has remained steady since May, reflecting the region's intense sun exposure. With a burn time of just 10 minutes, it's crucial to protect your skin during this month. The UV Index has remained notably elevated throughout the year, illustrating a clear pattern of extreme sunlight that peaks from March to June before gradually tapering off towards the end of the year. For more detailed information on the UV levels in Ilopango, check out Ilopango UV Index.

Maximum UV Index Levels in Ilopango for September

The chart shows the monthly maximum UV Index (UVI) for Ilopango 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 Ilopango typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec11121414141413131313109
Data source: Ilopango 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.

September Sunshine in Ilopango

In September, Ilopango, El Salvador, enjoys a delightful abundance of sunshine, averaging 299 hours of sunlight. This marks a slight dip from the sun-drenched peaks of the earlier months, such as March and July, each boasting impressive totals of 328 hours. The trend throughout the year reveals a warm climate and plenty of bright days, particularly in the earlier months, with February and April also basking in generous sunshine at 292 and 319 hours, respectively. As the year progresses towards the end, sunlight remains relatively steady, with October trailing close behind September at 290 hours. Overall, the consistent warmth characterizes Ilopango’s climate, making it an inviting destination for those longing to soak up the sun.

Monthly Sunshine Duration in Ilopango: September Highlighted

The September sunshine duration represents the total number of hours Ilopango experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec263h292h328h319h313h284h328h313h299h290h308h326h
Data source: Ilopango September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Ilopango During September

In Ilopango, El Salvador, September brings a notable shift in weather patterns, with a 24% chance of sunny days. This dips significantly from the sunnier months of January through April, where the likelihood of sunshine remains robust, peaking at 76% in February before tumbling downward through the rainy season. As summer fades and October approaches, the chance of sun slightly rebounds to 32%, yet the gloomy weather often prevails during September. This trend underscores the region's transition into its rainy period, where intermittent sunshine can be a welcome surprise amidst the clouds.

Percentage of Sunny Days in September in Ilopango

The chart illustrates the percentage of sunny days in Ilopango throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Ilopango experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec67%76%70%41%37%15%32%16%24%32%56%71%
Data source: Ilopango September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Ilopango in September

In Ilopango, El Salvador, September marks the continuation of a trend established in the preceding months, offering residents and visitors about 12 hours of daylight. This consistent daylight duration, which begins in March and lasts through September, provides ample sunshine for outdoor activities and vibrant community life. As the year transitions into October, daylight begins to wane, settling at 11 hours—a subtle yet noticeable shift that hints at the approaching seasonal changes. This rhythmic pattern of daylight not only enhances the beauty of Ilopango’s landscapes but also influences the local culture and daily routines, making each month uniquely vibrant in its own right.

Average Daylight Hours in Ilopango for September

The chart illustrates the variation in daylight duration in Ilopango throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 24m11h 41m12h 3m12h 26m12h 45m12h 54m12h 49m12h 32m12h 10m11h 47m11h 28m11h 18m
Data source: Ilopango daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Ilopango

In September, Ilopango experiences a gentle breeze, with an average wind speed of 1.2 m/s (3 mph), mirroring the calmness of the preceding months. This slight dip from the earlier peak in January and November, which boast higher averages of 2.0 m/s (5 mph), highlights a trend towards more tranquil conditions as the wet season approaches. The consistent light winds from June to September suggest a soothing atmosphere, providing a serene backdrop for residents and visitors alike, before the winds pick up again in the late fall. Such nuances of wind speed reflect the region's transitional climate, making September a peaceful yet dynamic time in Ilopango.

Average September Wind Speed in Ilopango

The chart displays monthly wind speed patterns in Ilopango, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.02.02.01.81.41.11.41.21.2 m/s1.22.01.8
Data source: Ilopango September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Ilopango Compares to Other Months

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

In September, the weather is notably warmer and more humid than in January, with average temperatures hovering around 26°C (79°F) and maximums reaching up to 34°C (94°F). This month experiences significant rainfall, averaging 291 mm (11.5 in) across 28 days, contributing to a high humidity level of 77%. In contrast, January features milder temperatures, with a minimum of 14°C (58°F) and a peak of 36°C (97°F), but it boasts a much drier climate, with just 3 mm (0.1 in) of precipitation over the entire month and no rainy days. The humidity also drops to 63%, making January a more comfortable month overall. For more detailed insights, you can visit Ilopango weather in January.

In September, the weather tends to be warm and humid, with temperatures ranging from a minimum of 20°C (69°F) to a maximum of 34°C (94°F) and an average of around 26°C (79°F). This month experiences significant rainfall, totaling 291 mm (11.5 in) over 28 days, contributing to a high humidity level of 77%. In contrast, February offers hotter temperatures, with a minimum of 16°C (61°F), an average of 26°C (80°F), and peaks reaching 39°C (102°F). Precipitation during February is minimal, with only 5 mm (0.2 in) recorded over just 1 day, and humidity drops to 62%. For a deeper insight into the February climate, you can check Ilopango weather in February.

In comparing the weather of September and March, we see distinct differences in temperature and precipitation patterns. September generally experiences warmer nights with a minimum temperature of 20°C (69°F) and an average of 26°C (79°F). However, it also brings significant rainfall, with an average precipitation of 291 mm (11.5 in) spread over 28 days, resulting in high humidity levels of 77%. In contrast, March tends to be warmer during the day, peaking at a maximum of 37°C (100°F), but features much drier conditions, with only 5 mm (0.2 in) of precipitation occurring over just one day and lower humidity at 59%. For more details on the weather in March, you can visit Ilopango weather in March.

When comparing the weather in September and April, notable differences emerge. September experiences a minimum temperature of 20°C (69°F) and an average of 26°C (79°F), with a maximum reaching 34°C (94°F). This month also sees significant rainfall, totaling 291 mm (11.5 in) across 28 days and exhibiting high humidity at 77%. In contrast, April boasts slightly cooler minimum temperatures at 19°C (67°F) but has a higher average of 28°C (82°F) and can reach maximum temperatures of 38°C (101°F). Additionally, April is much drier, receiving only 51 mm (2.0 in) of precipitation over 15 days, with lower humidity levels at 59%. For more specific details on April weather, you can visit Ilopango weather in April.

September and May exhibit some notable differences in weather patterns. September typically experiences a slightly lower average temperature of 26°C (79°F), compared to May's warmer average of 27°C (81°F). However, May can reach higher maximum temperatures, peaking at 36°C (97°F) compared to September's maximum of 34°C (94°F). In terms of precipitation, both months see significant rainfall, but September has a slightly higher amount at 291 mm (11.5 in) over 28 days, while May sees 279 mm (11.0 in) over 26 days. Additionally, humidity levels are higher in September at 77%, compared to the more comfortable 59% in May. For further insights into the weather during this month, you can check Ilopango weather in May.

In comparing the weather patterns of September and June, both months feature similar average temperatures, hovering around 26°C (79°F), but with distinct differences in their extremes. September exhibits a maximum temperature of 34°C (94°F), while June can reach up to 36°C (96°F), making June slightly hotter on average. Additionally, June experiences slightly lower humidity at 68% compared to September's 77%, contributing to a different feel despite the similar average temperatures. Precipitation levels are also notable; September sees a total of 291 mm (11.5 in) across 28 days, while June has a marginally higher total of 313 mm (12.3 in) over 27 days. For more detailed insights, check out Ilopango weather in June.

When comparing the weather in September and July, both months experience warm temperatures and high humidity, but September tends to be slightly cooler. In July, the average temperature reaches 27°C (81°F), peaking at a high of 36°C (97°F). In contrast, September's average temperature is a bit lower at 26°C (79°F), with a maximum of 34°C (94°F). Furthermore, September is marked by significantly higher rainfall, accumulating 291 mm (11.5 in) over 28 days, compared to July's 138 mm (5.4 in) over 18 days. For more details on the weather in July, you can visit Ilopango weather in July.

In comparing the weather between September and August, September tends to be slightly cooler, with temperatures ranging from a minimum of 20°C (69°F) to a maximum of 34°C (94°F), compared to August's range of 21°C (69°F) to 36°C (97°F). Additionally, September experiences more precipitation, totaling 291 mm (11.5 in) over 28 days, while August sees 232 mm (9.1 in) over 24 days. Humidity levels are similar, with September at 77% and August at 79%, indicating a consistently moist atmosphere in both months. For more details, you can check Ilopango weather in August.

In comparing the weather of September and October, we can observe a slight decrease in the average temperature, dropping from 26°C (79°F) in September to 25°C (78°F) in October. Both months share similar minimum and maximum temperatures, with lows around 20°C (68°F) to 20°C (69°F) and highs peaking at 34°C (93°F) to 34°C (94°F). Precipitation levels remain fairly consistent, with September recording 291 mm (11.5 in) and October slightly lower at 286 mm (11.3 in), both spread over 28 days. Notably, humidity levels stay steady at 77% for both months. For a more detailed look at October weather patterns, check out Ilopango weather in October.

In September, temperatures typically range from a minimum of 20°C (69°F) to a maximum of 34°C (94°F), with an average of 26°C (79°F). The month experiences significant rainfall, totaling 291 mm (11.5 in) over 28 days, coupled with high humidity levels of 77%. In contrast, November offers similar temperatures, with a minimum of 18°C (64°F) and an unchanged maximum of 34°C (94°F), but the overall precipitation is substantially lower, at 65 mm (2.5 in) over just 9 days, and slightly reduced humidity at 75%. For more details, you can check Ilopango weather in November.

In September, weather conditions are typically warm and humid, characterized by a minimum temperature of 20°C (69°F) and an average of 26°C (79°F), with maximums reaching 34°C (94°F). This month also sees significant rainfall, totaling 291 mm (11.5 in) over 28 days, resulting in a high humidity level of 77%. In contrast, December experiences milder temperatures, with a minimum of 16°C (62°F) and an average of 25°C (78°F), peaking at 35°C (96°F). Notably, December has very little precipitation, only 7 mm (0.3 in) over a single day, and lower humidity at 66%. For more details about December weather, check out Ilopango weather in December.

Compare Ilopango's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Ilopango

As September unfolds in Ilopango, it brings a distinctly wet and humid atmosphere compared to other months. While temperatures remain relatively warm, with averages hovering around 26°C, the significant increase in rainfall—totaling 291 mm over nearly the entire month—creates a unique environment that stands in contrast to the drier spells typical of the dry season. This high humidity level, reaching 77%, combined with frequent rain, gives the month a lush vibrancy, transforming the landscape as nature responds to the abundant moisture. For a deeper understanding of how September fits into the broader climate patterns, explore more about the region at Ilopango Climate.