April weather forecast
Jaco, Costa Rica

The weather in Jaco, Costa Rica, takes a turn in April with an incredible spike in rainfall to 68mm (2.68") from 17mm (0.67") in March. Despite this shift, temperatures continue to rise steadily, touching the warmest point of the year. Despite the increased rainfall, the increased hours of sunlight help to balance out the wet days. The humidity also begins to climb in April, adding to the tropical atmosphere. Despite the notable changes, vacationers and locals still find plenty to do and explore.

Temperature

April brings the highest temperatures, with an average high of 30.4°C (86.7°F) and an average low of 26.2°C (79.2°F).

Heat index

In April, the average heat index is estimated at a fiery hot 36°C (96.8°F). Emphasize additional safety, risk of heat cramps and heat exhaustion is high. Continuous activity might result in heatstroke.
Bear in mind that the heat index values are determined for shaded areas and light breezes. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
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 temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. When air moisture content is high, the cooling process through evaporation is not as efficient, leading to an ineffective body cooling process and a feeling of overheating. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

In Jaco, the average relative humidity in April is 71%.

Rainfall

In Jaco, in April, during 20.3 rainfall days, 68mm (2.68") of precipitation is typically accumulated. Throughout the year, there are 236.2 rainfall days, and 1501mm (59.09") of precipitation is accumulated.

Sea temperature

In Jaco, in April, the average water temperature is 29.3°C (84.7°F).
Note: Swimming, diving, and other water endeavors at temperatures between 25°C (77°F) and 29°C (84.2°F) are considered enjoyable and satisfying for extended periods without discomfort.

Daylight

The average length of the day in April in Jaco is 12h and 21min.
On the first day of April in Jaco, Costa Rica, sunrise is at 05:35 and sunset at 17:48. On the last day of the month, sunrise is at 05:21 and sunset at 17:49 CST.

Sunshine

In Jaco, the average sunshine in April is 9.4h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index of 7 during April translates into the following directions:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Stay alert! Reflective properties of sand and water amplify the Sun's UV radiation.