September weather forecast
Apastepeque, El Salvador

The first month of the autumn, September, is still a tropical month in Apastepeque, El Salvador, with an average temperature ranging between min 22.9°C (73.2°F) and max 30.2°C (86.4°F).

Temperature

The advent of September denotes an average high-temperature of a still hot 30.2°C (86.4°F), subtly different from August's 31.3°C (88.3°F). Apastepeque cools down to an average low-temperature of 22.9°C (73.2°F) throughout the month of September.

Heat index

In September, the average heat index is calculated to be a sweltering 39°C (102.2°F). Take additional safety steps, risk of heat exhaustion and heat cramps is notable. Prolonged activity may cause heatstroke.
Heat index evaluations are typically in the context of light winds and shaded environments. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
One of the main methods the human body employs to cool down is by perspiring, as this process allows sweat to evaporate and remove excess heat. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.

Humidity

The average relative humidity in September is 82%.

Rainfall

In Apastepeque, El Salvador, in September, it is raining for 27.5 days, with typically 182mm (7.17") of accumulated precipitation. In Apastepeque, El Salvador, during the entire year, the rain falls for 206.2 days and collects up to 1242mm (48.9") of precipitation.

Daylight

In September, the average length of the day is 12h and 12min.
On the first day of September in Apastepeque, sunrise is at 05:43 and sunset at 18:06. On the last day of the month, sunrise is at 05:44 and sunset at 17:45 CST.

Sunshine

The average sunshine in September is 8.8h.

UV index

January through September and December, with an average maximum UV index of 7, are months with the highest UV index in Apastepeque. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, a daily UV index of 7 turns into the following recommendations:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. 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. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.