September weather forecast
San Pedro Nonualco, El Salvador

The first month of the autumn, September, is still a hot month in San Pedro Nonualco, El Salvador, with an average temperature varying between 21.5°C (70.7°F) and 30.4°C (86.7°F).

Temperature

With the onset of September, the average high-temperature stands at a still tropical 30.4°C (86.7°F), closely aligned with August's 31.6°C (88.9°F). September's average low-temperature reading in San Pedro Nonualco settles at an agreeable 21.5°C (70.7°F).

Heat index

The heat index for September is appraised at a scorching 40°C (104°F). Take extra safety measures to prevent heat exhaustion and heat cramps. Heatstroke could follow lengthy activity.
Know that the heat index computations account for shaded terrains and slight winds. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', combines both the air temperature and the humidity level to give a perceived human temperature. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
Perspiration and the resultant sweat evaporation are the body's natural thermostat, helping regulate temperature. With a high level of moisture in the air, the evaporation process becomes less efficient, preventing the body from cooling down efficiently and resulting in a sensation of overheating. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

September is the most humid month in San Pedro Nonualco, with an average relative humidity of 84%.

Rainfall

In San Pedro Nonualco, in September, during 28.7 rainfall days, 188mm (7.4") of precipitation is typically accumulated. In San Pedro Nonualco, El Salvador, during the entire year, the rain falls for 216.4 days and collects up to 1164mm (45.83") of precipitation.

Daylight

The average length of the day in September is 12h and 12min.
On the first day of September in San Pedro Nonualco, El Salvador, sunrise is at 05:44 and sunset at 18:06. On the last day of the month, sunrise is at 05:45 and sunset at 17:45 CST.

Sunshine

In San Pedro Nonualco, the average sunshine in September is 8.3h.

UV index

The months with the lowest UV index are August through November, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily high UV index of 6 during September translates into the following recommendations:
Inhibit overexposure. Warding off sun damage is of utmost importance. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.