May weather forecast
Ilopango, El Salvador

May marks the official start of the wet season in Ilopango. In stark contrast to previous months, the city experiences 267mm (10.51") of rainfall over 26.9 rainy days. Yet, 12.8 hours of daylight and 10.7 hours of sun often punctuate the rainfall. Although the rainfall rises substantially, the temperatures remain steady making May a month of stark transitions in the city's climate.

Temperature

The shift to May signals an average high-temperature of a still tropical 31.8°C (89.2°F), subtly varied from April's 33.4°C (92.1°F). Ilopango throughout May, records an average low-temperature of 22.6°C (72.7°F).

Heat index

During May, the heat index is estimated at a scorching 42°C (107.6°F). Ensure extra safety steps, heat exhaustion and heat cramps are likely. Long activity might lead to heatstroke.
Records show heat index calculations are tailored for shaded regions and mild winds. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', combines both the air temperature and the humidity level to give a perceived human temperature. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. When relative humidity is at high levels, the evaporation rate lessens, causing the body to keep more heat than it would in less humid conditions. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

In Ilopango, the average relative humidity in May is 76%.

Rainfall

May is the month with the most rainfall. Rain falls for 26.9 days and accumulates 267mm (10.51") of precipitation.

Daylight

In May, the average length of the day is 12h and 46min.
On the first day of the month, sunrise is at 05:34 and sunset at 18:12. On the last day of May, in Ilopango, El Salvador, sunrise is at 05:27 and sunset at 18:20 CST.

Sunshine

In May, the average sunshine is 10.7h.

UV index

May 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 health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: In May, a regular UV index of 6 translates into these guidelines:
Resist extreme sun exposure. Guarding against solar damage is essential. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.