September weather forecast
San Esteban Catarina, El Salvador

September brings about a slight decrease in rainfall coupled with a marginal drop in temperature. Yet, the rainfall remains significantly high, contributing to the persistent humidity. Nevertheless, San Esteban Catarina boasts of comfortable climatic conditions. The month marks the highest relative humidity of 83%, signifying a concluding phase of the wet season. Fluctuating climate patterns prepare for the arrival of drier and somewhat crispier days of autumn.

Temperature

Transitioning into September, San Esteban Catarina records an average high-temperature of a still hot 30.6°C (87.1°F), almost identical to August's 32.1°C (89.8°F). September brings with it a nighttime average temperature of 21°C (69.8°F).

Heat index

For most parts of September, the heat index is computed to be a blisteringly hot 41°C (105.8°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', shows a temperature sensation when both heat and moisture conditions are combined. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are essentially critical for children. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

The months with the highest humidity in San Esteban Catarina, El Salvador, are September and October, with an average relative humidity of 83%.

Rainfall

In San Esteban Catarina, during September, the rain falls for 28.9 days and regularly aggregates up to 179mm (7.05") of precipitation. Throughout the year, in San Esteban Catarina, there are 219.1 rainfall days, and 1259mm (49.57") of precipitation is accumulated.

Daylight

In San Esteban Catarina, El Salvador, the average length of the day in September is 12h and 12min.
On the first day of September in San Esteban Catarina, 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 8.6h.

UV index

June, August through December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for average individuals.
Note: During September, 6 as the daily maximum UV index converts into the following advice:
Deflect overexposure. Sun protection is a necessity. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.