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 in Nejapa during this month.

Temperature

As August transitions into September, Nejapa records an average high-temperature of a moderately hot 29.8°C (85.6°F), showing a gentle shift from the preceding month. During September, an average low-temperature of 21.5°C (70.7°F) is observed.

Heat index

Throughout September, the heat index is evaluated at a very hot 38°C (100.4°F). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.
When referencing the heat index, its values are suitable for shady environments and light breezes. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', combines both the air temperature and the humidity level to give a perceived human temperature. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. 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, El Salvador, are September and October, with an average relative humidity of 82%.

Rainfall

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

Daylight

In Nejapa, the average length of the day in September is 12h and 12min.
On the first day of the month, sunrise is at 05:45 and sunset at 18:08. On the last day of September, 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 of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for average individuals.
Note: A daily high UV index of 6 in September leads to these guidelines:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.