April weather forecast
Kalmunai, Sri Lanka

April in Kalmunai showcases a radical shift in weather tendencies. The temperature increases beyond the 30°C (86°F) mark, indicating the arrival of peak summer. However, climate patterns revolve with rainfall reaching 57mm (2.24") from a low of 39mm (1.54") in March. The humidity remains consistently high, barely changing from the previous month. Despite the heat, the returning monsoon makes its presence felt in Kalmunai's April weather.

Temperature

As Kalmunai, Sri Lanka, steps into April, the average high-temperature is measured at a still hot 31.8°C (89.2°F), displaying minor differences from March's 30.1°C (86.2°F). Kalmunai experiences a nighttime temperature average of 25.9°C (78.6°F) during April.

Heat index

For April, the heat index is estimated at a blisteringly hot 42°C (107.6°F). Ensure extra safety steps, heat exhaustion and heat cramps are likely. Long activity might lead to heatstroke.
Keep in mind the heat index values are meant for areas in shade and with light wind. 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', represents the fusion of temperature and moisture in the air to suggest how warm it feels. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are extremely significant 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.
Normally, the human body cools itself through perspiration, which removes excessive heat by evaporating sweat. In circumstances of high air temperature and humidity (high heat index), the body's perspiration is restricted, heightening the feeling of warmth. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

In Kalmunai, the average relative humidity in April is 75%.

Rainfall

In Kalmunai, Sri Lanka, in April, during 19.1 rainfall days, 57mm (2.24") of precipitation is typically accumulated. Throughout the year, there are 237.8 rainfall days, and 1259mm (49.57") of precipitation is accumulated.

Sea temperature

The months with the warmest seawater in Kalmunai are April and May, with an average sea temperature of 29.8°C (85.6°F).
Note: Water temperatures between 25°C (77°F) and 29°C (84.2°F) are ideal for swimming, diving, and other activities, ensuring comfort and enjoyment for lengthened periods.

Daylight

In April, the average length of the day in Kalmunai, Sri Lanka, is 12h and 17min.
On the first day of April, sunrise is at 06:00 and sunset at 18:12. On the last day of the month, sunrise is at 05:48 and sunset at 18:11 +0530.

Sunshine

In Kalmunai, the average sunshine in April is 11.2h.

UV index

The months with the highest UV index in Kalmunai are January through October, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The maximum UV index, 7 during April, leads to the following recommendations:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Be vigilant! The Sun's UV rays get a boost from sand and water reflections.