May weather forecast
Guatemala City, Guatemala

The last month of the spring, May, is another warm month in Guatemala City, Guatemala, with average temperature varying between 16.8°C (62.2°F) and 27.1°C (80.8°F).

Temperature

In May, the average high-temperature is practically the same as in April - a still warm 27.1°C (80.8°F). The average low-temperature, in May, is 16.8°C (62.2°F).

Heat index

In May, the average heat index is appraised at 29.7°C (85.5°F). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'feels like', or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, metabolic differences, wind), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in May is 77.3%.

Rainfall

In Guatemala City, it is raining for 12.4 days, with typically 128.9mm (5.07") of accumulated precipitation. In Guatemala City, during the entire year, the rain falls for 125.2 days and collects up to 1274.8mm (50.19") of precipitation.

Daylight

In May, the average length of the day in Guatemala City is 12.8h.

Sunshine

In Guatemala City, the average sunshine is 5.9h.

UV index

Months with the highest UV index in Guatemala City are February through October, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an extreme threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: In May, the average maximum UV index of 12 translate into the following recommendations:
Take all required precautions, as unprotected skin and eyes can burn in minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Protect yourself by liberally applying a sunscreen of at least 30 SPF. Sunscreen prevents sunburn and decreases the damaging effects of Sun's radiation on the immune system.