September weather forecast
Metapan, El Salvador

September in Metapan is a month of contrast. Weather conditions make a drastic reversal as rainfall jumps up to an average of 141mm (5.55"). High cloud% indicates that this is a month of overcast skies with limited sunshine hours. Despite the increased rainfall, temperatures remain steady. September signifies the re-entry of the vigorous monsoon season that engulfs the city, much to the delight of rain lovers.

Temperature

The shift into September in Metapan reveals an average high-temperature of a moderately hot 29.3°C (84.7°F), closely mirroring August's climate. September nights in Metapan cool down to an average low-temperature of 18.9°C (66°F).

Heat index

In September, the heat index is calculated to be a fiery hot 37°C (98.6°F). Emphasize additional safety, risk of heat cramps and heat exhaustion is high. Continuous activity might result in heatstroke.
Heat index data is primarily for areas with shade and subjected to light 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 'felt air temperature' or 'feels like', is the outcome of merging air's temperature and its humidity metrics. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are particularly relevant to children. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

In September, the average relative humidity in Metapan is 85%.

Rainfall

In Metapan, during September, the rain falls for 24.7 days and regularly aggregates up to 141mm (5.55") of precipitation. Throughout the year, in Metapan, El Salvador, there are 181.4 rainfall days, and 1055mm (41.54") of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 13min.
On the first day of the month, sunrise is at 05:45 and sunset at 18:09. On the last day of September, sunrise is at 05:47 and sunset at 17:47 CST.

Sunshine

The average sunshine in September is 7.8h.

UV index

With an average maximum UV index of 5, September is the month with the lowest UV index. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Adopt protective measures - Suggestions to resist sunburn are offered. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.