May weather forecast
Valle de San Juan, Colombia

The last month of the spring, May, is another hot month in Valle de San Juan, Colombia, with temperature in the range of an average low of 20°C (68°F) and an average high of 33°C (91.4°F).

Temperature

The onset of May brings an average high-temperature of a still tropical 33°C (91.4°F), nearly matching the April temperature. From the heights of the May heat, Valle de San Juan records a mean nighttime low of 20°C (68°F).

Heat index

During May, the heat index is calculated to be an extremely hot 41°C (105.8°F). Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.
It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Excessive heat gain, when not shed effectively by the body, can result in increasing body temperatures and related hazards.

Humidity

In May, the average relative humidity is 63%.

Rainfall

In Valle de San Juan, in May, during 23.4 rainfall days, 80mm (3.15") of precipitation is typically accumulated. In Valle de San Juan, during the entire year, the rain falls for 211.1 days and collects up to 802mm (31.57") of precipitation.

Daylight

The average length of the day in May is 12h and 19min.
On the first day of the month, sunrise is at 05:49 and sunset at 18:05. On the last day of May, in Valle de San Juan, sunrise is at 05:47 and sunset at 18:08 -05.

Sunshine

In May, the average sunshine is 11.3h.

UV index

May, June, November and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The daily high UV index of 6 during May translates into the following recommendations:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.