September weather forecast
Nejapa, El Salvador

September in Nejapa presents one of the highest levels of relative humidity at 82%. Cloud cover also peaks, reaching up to 38% coverage. Despite this, an average temperature remains consistent, ensuring the comfort of locals and visitors alike. September's weather carries the distinct charm of the rainy season but leaves room for a fair duration of sunshine. This rich mix of sun and rain culminates in an unexpected but pleasant variety for anyone during this month.

Temperature

With the onset of September, the average high-temperature stands at a moderately hot 29.8°C (85.6°F), closely aligned with August's 30.8°C (87.4°F). During September nights, Nejapa records an average temperature of 21.5°C (70.7°F).

Heat index

For September, the heat index is estimated at a very hot 38°C (100.4°F). Take more preventive steps, risk of heat exhaustion and heat cramps is elevated. Long activity may culminate in heatstroke.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is the result of factoring in humidity to the air temperature, indicating perceived warmth. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

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

Rainfall

In September, the rain falls for 26.3 days. Throughout September, 142mm (5.59") of precipitation is accumulated. In Nejapa, El Salvador, during the entire year, the rain falls for 187 days and collects up to 1106mm (43.54") of precipitation.

Daylight

In September, the average length of the day is 12h and 12min.
On the first day of September in Nejapa, sunrise is at 05:45 and sunset at 18:08. On the last day of the month, sunrise is at 05:46 and sunset at 17:47 CST.

Sunshine

In Nejapa, the average sunshine in September is 9.3h.

UV index

January, May, June, August through December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: A typical high UV index of 6 in September suggests the following recommendations:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.