April weather forecast
Caldera, Costa Rica

April, like March, is another hot spring month in Caldera, Costa Rica, with an average temperature ranging between max 32.5°C (90.5°F) and min 24.3°C (75.7°F).

Temperature

April ushers in an average high-temperature of a still hot 32.5°C (90.5°F), aligning closely with the preceding month. The month of April records an average low-temperature of 24.3°C (75.7°F).

Heat index

In April, the heat index is appraised at a blisteringly hot 41°C (105.8°F). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.
Heat index evaluations are typically in the context of light winds and shaded environments. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

In April, the average relative humidity is 67%.

Rainfall

In April, the rain falls for 14.4 days. Throughout April, 36mm (1.42") of precipitation is accumulated. In Caldera, during the entire year, the rain falls for 218.6 days and collects up to 1456mm (57.32") of precipitation.

Daylight

In Caldera, the average length of the day in April is 12h and 21min.
On the first day of the month, sunrise is at 05:35 and sunset at 17:49. On the last day of April, sunrise is at 05:21 and sunset at 17:50 CST.

Sunshine

In April, the average sunshine in Caldera is 9.5h.

UV index

The months with the highest UV index in Caldera 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 vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The daily high UV index of 7 during April translates into the following recommendations:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Always opt for UVA and UVB-resistant sunglasses on radiant days.