May weather forecast
San Luis, Guatemala

The last month of the spring, May, is also a hot month in San Luis, Guatemala, with an average temperature ranging between max 32.2°C (90°F) and min 21.3°C (70.3°F).

Temperature

The average high-temperature during May registers at a still hot 32.2°C (90°F), maintaining a close resemblance to the previous month. In May, the recorded average low-temperature is an agreeable 21.3°C (70.3°F).

Heat index

Throughout May, the heat index is calculated to be a blisteringly hot 44°C (111.2°F). Keep guard: Heat cramps and heat exhaustion are likely. Continued activity increases the risk of heatstroke.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', evaluates the perceived heat by adding the effect of moisture in the air. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are particularly relevant to children. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

The average relative humidity in May is 78%.

Rainfall

In May, the rain falls for 24.1 days. Throughout May, 117mm (4.61") of precipitation is accumulated. Throughout the year, in San Luis, there are 260.2 rainfall days, and 1135mm (44.69") of precipitation is accumulated.

Daylight

In San Luis, the average length of the day in May is 12h and 53min.
On the first day of the month, sunrise is at 05:32 and sunset at 18:16. On the last day of May, in San Luis, sunrise is at 05:24 and sunset at 18:26 CST.

Sunshine

In San Luis, the average sunshine in May is 9.3h.

UV index

In San Luis, the average daily maximum UV index in May is 6. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: A daily maximum UV index of 6 in May translates into the following instructions:
Shun overexposure. Protection from sun ravages is indispensable. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.