May weather forecast
San Salvador, El Salvador

May marks the beginning of the rainy season in San Salvador. The temperatures stay steady but the spike in relative humidity to 76% from last month’s 67% makes the city feel significantly wetter. A decline in visibility coincides with the increased rainfall and cloud cover. Despite these changes, individuals still benefit from approximately 12.8 hours of daily daylight. Most notably, the month's total rainfall surges to a maximum of 234mm (9.21") over 25.5 days.

Temperature

The advent of May in San Salvador presents an average high-temperature of a still tropical 30.9°C (87.6°F), maintaining a close correlation with the preceding month. In May, San Salvador reports a consistent average low-temperature of 22.7°C (72.9°F) during the nights.

Heat index

The average heat index in May is appraised at a sweltering 39°C (102.2°F). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.
Always consider that heat index estimations are for light winds and places in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', reflects the blend of air temperature and relative humidity to give a temperature impression. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

In May, the average relative humidity is 76%.

Rainfall

The month with the most rainfall is May, when the rain falls for 25.5 days and typically aggregates up to 234mm (9.21") of precipitation.

Daylight

In May, the average length of the day in San Salvador, El Salvador, is 12h and 46min.
On the first day of May in San Salvador, sunrise is at 05:34 and sunset at 18:12. On the last day of the month, sunrise is at 05:28 and sunset at 18:21 CST.

Sunshine

In May, the average sunshine in San Salvador is 10.8h.

UV index

The months with the lowest UV index in San Salvador are January, May, June, August through December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index of 6 in May converts into the following recommendations:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.