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

San Marcos witnesses its highest average temperatures during March and April, peaking at 33.4°C (92.1°F).

Heat index

Throughout April, the heat index is computed to be a blisteringly hot 43°C (109.4°F). Be wary: Heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are extremely vital to babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
Humans rely on perspiration as a cooling mechanism, wherein the evaporating sweat counteracts excessive warmth. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

In April, the average relative humidity is 65%.

Rainfall

In San Marcos, El Salvador, in April, it is raining for 16.3 days, with typically 53mm (2.09") of accumulated precipitation. Throughout the year, in San Marcos, there are 196.7 rainfall days, and 1216mm (47.87") of precipitation is accumulated.

Daylight

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

Sunshine

The month with the most sunshine is April, with an average of 11.3h of sunshine.

UV index

January through April, with an average maximum UV index of 7, are months with the highest UV index in San Marcos. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily high UV index of 7 during April translates into the following recommendations:
Guard against overexposure. Protection from sun-induced harm is essential. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.