April weather forecast
Upala, Costa Rica

Weather patterns in April in the city of Upala, Costa Rica, are much more pronounced than those in March and foreshadow the arrival of May. April sees the highest temperature of the year at 32.2°C (90°F), heralding the commencement of the hot season in this region. The relative humidity too follows a downward trend, paving the way for comfortable, less oppressive days. However, one can expect to experience increased cloud coverage and moderate and well-distributed rainfall. Sunshine hours marginally increase as the days lengthen toward the summer solstice.

Temperature

April, having an average high-temperature of 32.2°C (90°F) and an average low-temperature of 23.4°C (74.1°F), is the warmest month.

Heat index

The average heat index in April is appraised at a blistering 43°C (109.4°F). Be wary: Heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Take into consideration that the heat index values are calculated for shade and light wind conditions. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'feels like', quantifies the warmth felt when relative humidity is considered. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. An increase in relative humidity hinders the body's normal cooling function by reducing evaporation, thereby decreasing the rate of body cooling and enhancing the sense of warmth. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

April is the least humid month, with an average relative humidity of 74%.

Rainfall

In Upala, Costa Rica, in April, during 17.5 rainfall days, 28mm (1.1") of precipitation is typically accumulated. In Upala, during the entire year, the rain falls for 295.8 days and collects up to 1656mm (65.2") of precipitation.

Daylight

In April, the average length of the day in Upala is 12h and 23min.
On the first day of April, sunrise is at 05:36 and sunset at 17:50. On the last day of the month, sunrise is at 05:21 and sunset at 17:52 CST.

Sunshine

In April, the average sunshine is 7.7h.

UV index

March through June, August and September, with an average maximum UV index of 7, are months with the highest UV index in Upala, Costa Rica. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum daily UV index of 7 during April morphs into the following directions:
Use protective steps and abide by sun safety guidelines. Safeguarding against skin and eye harm is necessary. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.