May weather forecast
Petacalco, Mexico

The last month of the spring, May, is also a hot month in Petacalco, Mexico, with an average temperature fluctuating between 23.8°C (74.8°F) and 31.3°C (88.3°F).

Temperature

With May's advent, Petacalco sees an average high-temperature of a still tropical 31.3°C (88.3°F), subtly shifted from April's 30.6°C (87.1°F). Petacalco observes an average nighttime temperature of 23.8°C (74.8°F) during May.

Heat index

The heat index value during May is estimated at a sweltering 37°C (98.6°F). Adopt additional preventive measures, heat cramps and heat exhaustion are potential outcomes. Prolonged activity may trigger heatstroke.
Bear in mind that the heat index values are determined for shaded areas and light breezes. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', arises from combining readings of air temperature and relative moisture content. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.

Humidity

In Petacalco, the average relative humidity in May is 67%.

Rainfall

Months with rainfall are January through March, May through December. May is the first month it rains. Throughout May, in the average 3.8 rainfall days, it receives 4mm (0.16") of precipitation. Throughout the year, there are 78.8 rainfall days, and 363mm (14.29") of precipitation is accumulated.

Daylight

In May, the average length of the day is 12h and 59min.
On the first day of the month, sunrise is at 6:21 am and sunset at 7:09 pm. On the last day of May, sunrise is at 6:12 am and sunset at 7:20 pm CST.

Sunshine

In Petacalco, the average sunshine in May is 9.9h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the average person.
Note: In May, the maximum UV index of 7 suggests this advice:
Inhibit overexposure. Warding off sun damage is of utmost importance. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. A hat with a broad brim is indispensable, filtering out up to half of UV rays.