September weather forecast
Apopa, El Salvador

September offers up a continuation of substantial rainfall to 150mm (5.91"), persistent humidity, and slightly cooler temperatures. As the wet season advances, locals and tourists alike can enjoy the natural beauty enhanced by the rains. Sunny days persist, albeit fewer, while wind speeds begin to drop a notch to about 4.5km/h (2.8mph). September portrays the combination of the ongoing rainy season and moderating climate conditions.

Temperature

The start of September in Apopa marks an average high-temperature of a still tropical 30.5°C (86.9°F), hardly distinguishable from the conditions in August. September's average low-temperature reading in Apopa settles at a pleasant 20.9°C (69.6°F).

Heat index

September's mean heat index is appraised at a blistering 40°C (104°F). Take extra safety measures to prevent heat exhaustion and heat cramps. Heatstroke could follow lengthy activity.
One should be cognizant that the heat index values are tailored for shaded spots and mild winds. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is the result of factoring in humidity to the air temperature, indicating perceived warmth. 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. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
By perspiring, the human body can shed its excessive warmth since evaporated sweat cools it off. With an abundance of moisture present in the air, the process of evaporation becomes less effective, and the body fails to cool down as it should, leading to the sensation of overheating. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

September and October, with an average relative humidity of 82%, are the most humid months in Apopa.

Rainfall

In Apopa, El Salvador, during September, the rain falls for 26.5 days and regularly aggregates up to 150mm (5.91") of precipitation. In Apopa, 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 in Apopa is 12h and 12min.
On the first day of September in Apopa, sunrise is at 05:45 and sunset at 18:07. On the last day of the month, sunrise is at 05:46 and sunset at 17:46 CST.

Sunshine

The average sunshine in September in Apopa is 9h.

UV index

May through December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, the UV index of 6 transforms into the following advice:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Opt for tightly woven and loose clothing to enhance protection from the Sun.