May weather forecast
Caldera, Costa Rica

The last month of the spring, May, is also a hot month in Caldera, Costa Rica, with temperature in the range of an average high of 30.7°C (87.3°F) and an average low of 24.6°C (76.3°F).

Temperature

Caldera starts May with an average high-temperature of a still tropical 30.7°C (87.3°F), hinting at a minimal fluctuation from April. Throughout the month of May, Caldera expects an average low of 24.6°C (76.3°F).

Heat index

The heat index value for May is appraised at a fiery hot 38°C (100.4°F). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
Heat index values are typically calculated for conditions of shade and a light breeze. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', takes into account both air temperature and humidity to illustrate what people actually feel. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

In Caldera, the average relative humidity in May is 75%.

Rainfall

In Caldera, during May, the rain falls for 25.3 days and regularly aggregates up to 175mm (6.89") of precipitation. Throughout the year, in Caldera, there are 218.6 rainfall days, and 1456mm (57.32") of precipitation is accumulated.

Daylight

In Caldera, the average length of the day in May is 12h and 35min.
On the first day of May, sunrise is at 05:21 and sunset at 17:50. On the last day of the month, sunrise is at 05:16 and sunset at 17:56 CST.

Sunshine

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

UV index

The months with the highest UV index in Caldera, Costa Rica, are January through September and December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index of 7 in May converts into the following recommendations:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.