May weather forecast and climate
Guatemala City, Guatemala

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

Temperature

In Guatemala City, the average high-temperature is essentially the same as in April - a still moderately hot 27.1°C (80.8°F). In May, in Guatemala City, Guatemala, the average low-temperature is 16.8°C (62.2°F).

Heat index

In May, the average heat index is estimated at 29.7°C (85.5°F). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'felt air temperature', or 'apparent temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (pregnancy, wind, clothing). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In May, the average relative humidity in Guatemala City, Guatemala, is 77.3%.

Rainfall

In Guatemala City, during 12.4 rainfall days, 128.9mm (5.1") of precipitation is typically accumulated. In Guatemala City, during the entire year, the rain falls for 125.2 days and collects up to 1274.8mm (50.2") of precipitation.

Daylight

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

Sunshine

The average sunshine in May is 5.9h.

UV index

February through October, with an average maximum UV index of 12, are months with the highest UV index. A UV Index of 11, and more, symbolizes an excessive health risk from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 12 in May transform into the following instructions:
Practice all essential precautions. Protection against sun damage is crucial. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Prolonged stay under the direct sun should be avoided as much as possible, especially if a person burns easily. Sunscreen with a minimum 30 sun protection factor should always be used.