September weather forecast
San Salvador, El Salvador

September sees a slight dip in temperature in San Salvador, mirrored by the decline in daylight and sunshine duration. Rainfall continues unabated, contributing to high levels of humidity and cloud cover. Despite this, the UV index remains consistently high. Distinctively, the month experiences the most amount of cloud cover in the year, a whopping 38%. Moisture levels also peak, with a recorded rainfall of 142mm (5.59") over approximately 26.3 rainy days.

Temperature

September in San Salvador records an average high-temperature of a warm 29.8°C (85.6°F), indicating a minor variation from the preceding month. An average low-temperature of 21.5°C (70.7°F) is expected during September.

Heat index

In September, the average heat index is appraised at a very hot 38°C (100.4°F). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
Given the heat index, its values are aligned with shaded sites and gentle winds. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', takes into account both air temperature and humidity to illustrate what people actually feel. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. 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. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

The months with the highest humidity in San Salvador 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 San Salvador, El Salvador, during the entire year, the rain falls for 187 days and collects up to 1106mm (43.54") of precipitation.

Daylight

In San Salvador, El Salvador, the average length of the day in September is 12h and 12min.
On the first day of September in San Salvador, sunrise is at 05:45 and sunset at 18:07. On the last day of the month, sunrise is at 05:46 and sunset at 17:46 CST.

Sunshine

In San Salvador, 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 reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for average individuals.
Note: The UV index of 6 during September leads to these advisories:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.