April weather forecast
San Marcos, El Salvador

April tags along with increased rainfall and warmer temperatures compared to its preceding month, March. It is during this month that the wet season sets in, indicated by a considerable jump in rain from 6mm (0.24") in March to 53mm (2.09"). This forecast suggests April as a slightly less favorable month for outdoor activities, given the increased chances of rain. Yet, with an average temperature peaking at 33.4°C (92.1°F), the relatively warm weather persists throughout the month. Another notable change is the increased cloud cover, contributing to comparatively fewer sunshine hours.

Temperature

In San Marcos, March and April are characterised by the peak of temperatures, recording an average high of 33.4°C (92.1°F).

Heat index

In April, the average heat index is appraised at a blisteringly hot 43°C (109.4°F). Remain alert: Heat exhaustion and heat cramps are predicted. Extended effort can lead to heatstroke.
Remember that heat index calculations are made for conditions in the shade with light wind. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', quantifies the warmth felt when relative humidity is considered. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
Perspiration, which is the evaporation of sweat, is a primary way the human body manages and dispels excessive warmth. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.

Humidity

The average relative humidity in April in San Marcos is 65%.

Rainfall

In April, the rain falls for 16.3 days. Throughout April, 53mm (2.09") of precipitation is accumulated. Throughout the year, there are 196.7 rainfall days, and 1216mm (47.87") of precipitation is accumulated.

Daylight

The average length of the day in April in San Marcos, El Salvador, is 12h and 27min.
On the first day of the month, sunrise is at 05:52 and sunset at 18:08. On the last day of April, sunrise is at 05:35 and sunset at 18:12 CST.

Sunshine

April has the most sunshine of the year, with an average of 11.3h of sunshine.

UV index

The months with the highest UV index are January through April, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 7 during April translates into the following directions:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.