May weather forecast
Guarumal, Costa Rica

May, the last month of the spring in Guarumal, is another warm month, with an average temperature varying between 26.2°C (79.2°F) and 29.5°C (85.1°F).

Temperature

May's onset records a minor alteration in the average high-temperature to a moderately hot 29.5°C (85.1°F) from April's 30.4°C (86.7°F). Nighttime temperatures in Guarumal hover around an average low of 26.2°C (79.2°F) in May, a slight descent from daytime highs.

Heat index

Throughout May, the heat index is estimated at a very hot 35°C (95°F). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
Heat index evaluations are typically in the context of light winds and shaded environments. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
Evaporating sweat is a key way the human body dispels excessive warmth, all thanks to the process of perspiration. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

Humidity

In May, the average relative humidity in Guarumal is 77%.

Rainfall

In Guarumal, during May, the rain falls for 25.3 days and regularly aggregates up to 201mm (7.91") of precipitation. In Guarumal, during the entire year, the rain falls for 236.2 days and collects up to 1501mm (59.09") of precipitation.

Daylight

The average length of the day in May is 12h and 34min.
On the first day of May in Guarumal, sunrise is at 05:20 and sunset at 17:49. On the last day of the month, sunrise is at 05:15 and sunset at 17:55 CST.

Sunshine

In May, the average sunshine in Guarumal is 8.7h.

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: During May, 7 as the daily maximum UV index converts into the following advice:
Guard oneself from overexposure. Defence against sun injury is vital. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. During bright days, sunglasses that offer UVA and UVB defense are recommended.