September weather forecastIlopango, El Salvador

Weather in September

September marks a peak in rainfall with 150mm (5.91") received over 26.5 days. The reduction in daylight hours to 12.2 coincides with the decline in temperatures. Wind speeds lessen slightly to 4.5km/h (2.8mph), providing a small respite from the dowpour. A slight reduction in the average number of sunshine hours observed does not deter tourists, as the city's beauty shines through.

Temperature

The average high-temperature during September registers at a still hot 30.5°C (86.9°F), maintaining a close resemblance to the previous month. Ilopango records an average low-temperature of 20.9°C (69.6°F) throughout the month of September.

Heat index

In September, the average heat index is estimated at an extremely hot 40°C (104°F). Exercise increased caution, heat cramps and heat exhaustion are potential hazards. Continuous activity could lead to heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', comes about by integrating the temperature readings with the humidity levels. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
As a reaction to high temperatures, the human body begins to perspire, using the evaporation of sweat to lower its temperature. When relative humidity is at high levels, the evaporation rate lessens, causing the body to keep more heat than it would in less humid conditions. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

The months with the highest humidity are September and October, with an average relative humidity of 82%.

Rainfall

In Ilopango, in September, it is raining for 26.5 days, with typically 150mm (5.91") of accumulated precipitation. In Ilopango, during the entire year, the rain falls for 196.7 days and collects up to 1216mm (47.87") of precipitation.

Daylight

The average length of the day in September is 12h and 12min.
On the first day of September, sunrise is at 05:44 and sunset at 18:07. On the last day of the month, sunrise is at 05:45 and sunset at 17:46 CST.

Sunshine

In Ilopango, the average sunshine in September is 9h.

UV index

The months with the lowest UV index are May through December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: An average UV index of 6 in September transforms into this advice:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.