April weather forecast
Jaffna, Sri Lanka

Heading into April, Jaffna, Sri Lanka experiences high daily temperatures, reaching up to 30.4°C (86.7°F). Yet, with an increase in humidity to 77%, the overall feeling could be warm. Sea temperatures also begin to climb at this time, calling to beach-goers. The winds, however, continue to lessen from the more blustery start of the year. Notwithstanding these changes, April ushers in the heart of the dry season, with longer hours of brilliant sunshine.

Temperature

In Jaffna, the peak temperatures are generally noted in April, averaging a high of 30.4°C (86.7°F) and a low of 28.1°C (82.6°F).

Heat index

During April, the heat index is calculated to be a sweltering 38°C (100.4°F). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
When assessing, remember that heat index measurements are for light winds and shaded spots. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', takes into account both air temperature and humidity to illustrate what people actually feel. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

In Jaffna, the average relative humidity in April is 77%.

Rainfall

In Jaffna, Sri Lanka, during April, the rain falls for 7.5 days and regularly aggregates up to 20mm (0.79") of precipitation. In Jaffna, during the entire year, the rain falls for 148.6 days and collects up to 769mm (30.28") of precipitation.

Sea temperature

April is the month with the warmest seawater, with an average sea temperature of 30.1°C (86.2°F).
Note: Many find water temperatures above 30°C (86°F) uncomfortable, particularly when seeking relief from the sun and heat.

Daylight

In April, the average length of the day is 12h and 20min.
On the first day of the month, sunrise is at 06:06 and sunset at 18:20. On the last day of April, sunrise is at 05:53 and sunset at 18:21 +0530.

Sunshine

The average sunshine in April in Jaffna is 10.5h.

UV index

January through October and December, with an average maximum UV index of 7, are months with the highest UV index in Jaffna. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: In April, the maximum UV index of 7 suggests this advice:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Caution! The Sun's UV rays become stronger due to reflections from water and sand.