May weather forecast
John, French Guiana

The last month of the spring, May, is another warm month in John, French Guiana, with an average temperature ranging between min 23.3°C (73.9°F) and max 29.5°C (85.1°F).

Temperature

May ushers in an average high-temperature of a still warm 29.5°C (85.1°F), aligning closely with the preceding month. John, during the month of May, experiences an average low-temperature of 23.3°C (73.9°F).

Heat index

The heat index in May is evaluated at a torrid 38°C (100.4°F). Heightened precautions are necessary, heat cramps and heat exhaustion are potential risks. Continuous activity could lead to heatstroke.
The heat index's values are generally associated with conditions in shade and light breezes. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', evaluates the perceived heat by adding the effect of moisture in the air. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

In John, the average relative humidity in May is 86%.

Rainfall

The month with the most rainfall is May, when the rain falls for 28 days and typically aggregates up to 137mm (5.39") of precipitation.

Daylight

The average length of the day in May is 12h and 21min.
On the first day of May, sunrise is at 06:22 and sunset at 18:40. On the last day of the month, sunrise is at 06:20 and sunset at 18:43 -03.

Sunshine

In John, the average sunshine in May is 5.9h.

UV index

The months with the lowest UV index are January through June and December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum UV index, 6 during May, leads to the following recommendations:
Guard against overexposure. Protection from sun-induced harm is essential. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. A hat with a broad brim is indispensable, filtering out up to half of UV rays.