September weather forecast
Izalco, El Salvador

The first month of the autumn, September, is still a warm month in Izalco, El Salvador, with temperature in the range of an average low of 22.1°C (71.8°F) and an average high of 29.2°C (84.6°F).

Temperature

The onset of September notes an average high-temperature of a moderately hot 29.2°C (84.6°F), subtly shifted from August's 30°C (86°F). Izalco, during September, witnesses an average low-temperature of 22.1°C (71.8°F).

Heat index

The average heat index in September is evaluated at a fiery hot 36°C (96.8°F). Exercise special caution, heat exhaustion and heat cramps are probable. Prolonged activity may induce heatstroke.
The heat index's values are generally associated with conditions in shade 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 'felt air temperature' or 'feels like', ties air temperature with relative humidity to produce the perceived temperature sensation. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are quite important for children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
The human body keeps its cool primarily through perspiration, as this process enables sweat to evaporate, taking away the excess heat. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. 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 Izalco are September and October, with an average relative humidity of 81%.

Rainfall

In Izalco, in September, it is raining for 24 days, with typically 113mm (4.45") of accumulated precipitation. In Izalco, during the entire year, the rain falls for 166.9 days and collects up to 832mm (32.76") of precipitation.

Daylight

In September, the average length of the day in Izalco is 12h and 12min.
On the first day of September in Izalco, sunrise is at 05:47 and sunset at 18:09. On the last day of the month, sunrise is at 05:48 and sunset at 17:48 CST.

Sunshine

In Izalco, El Salvador, the average sunshine in September is 9.6h.

UV index

June, August through December, with an average maximum UV index of 6, are months with the lowest UV index in Izalco, El Salvador. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.