September weather forecast
San José Villanueva, El Salvador

September ushers in slight weather changes in San José Villanueva with further reductions in temperature. The continuous rainfall and high humidity are steady reminders of the ongoing wet season. The city also contends with the lowest visibility of the year at 8km (5mi) due to increased cloud cover. As the frequency of rainy days peaks, the winds fall to their lowest speeds, further intensifying the moist conditions. The UV index remaining at 6 indicates a consistent level of prevalent sun strength.

Temperature

San José Villanueva marks the onset of September with an average high-temperature of a warm 29.8°C (85.6°F), subtly divergent from August's 30.8°C (87.4°F). Throughout September nights, San José Villanueva registers an average low-temperature of 21.5°C (70.7°F).

Heat index

For September, the heat index is estimated at a sweltering 38°C (100.4°F). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.
Keep in mind the heat index values are meant for areas in shade and with light wind. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
Evaporation of sweat is the main factor behind the cooling effect of perspiration in the human body. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

The months with the highest humidity in San José Villanueva are September and October, with an average relative humidity of 82%.

Rainfall

In September, in San José Villanueva, the rain falls for 26.3 days. Throughout September, 142mm (5.59") of precipitation is accumulated. In San José Villanueva, during the entire year, the rain falls for 187 days and collects up to 1106mm (43.54") of precipitation.

Daylight

The average length of the day in September in San José Villanueva is 12h and 12min.
On the first day of the month, sunrise is at 05:45 and sunset at 18:08. On the last day of September, in San José Villanueva, sunrise is at 05:46 and sunset at 17:47 CST.

Sunshine

In September, the average sunshine in San José Villanueva, El Salvador, is 9.3h.

UV index

The months with the lowest UV index are January, May, June, August through December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index of 6 during September leads to these instructions:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.