May weather forecast
Grand Usine, French Guiana

The last month of the spring, May, is another warm month in Grand Usine, French Guiana, with temperature in the range of an average high of 29.8°C (85.6°F) and an average low of 21.9°C (71.4°F).

Temperature

The shift into May finds Grand Usine at an average high-temperature of a still warm 29.8°C (85.6°F), corresponding to April's conditions. During the month of May, Grand Usine experiences a steady low-temperature average of 21.9°C (71.4°F).

Heat index

The heat index in May is computed to be an extremely hot 40°C (104°F). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
Know that the heat index computations account for shaded terrains and slight winds. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'real feel', combines both the air temperature and the humidity level to give a perceived human temperature. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. Under conditions of increased relative humidity, the evaporation rate lessens, causing the body to retain more heat than under less humid conditions. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

May is the most humid month in Grand Usine, with an average relative humidity of 90%.

Rainfall

The month with the most rainfall in Grand Usine, French Guiana, is May, when the rain falls for 25.9 days and typically aggregates up to 192mm (7.56") of precipitation.

Daylight

The average length of the day in May in Grand Usine is 12h and 16min.
On the first day of the month, sunrise is at 06:21 and sunset at 18:35. On the last day of May, sunrise is at 06:20 and sunset at 18:38 -03.

Sunshine

In Grand Usine, the average sunshine in May is 5.1h.

UV index

In May, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: A daily high UV index of 6 in May leads to these guidelines:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. 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. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.