April weather forecast
Negombo, Sri Lanka

April brings more heat and humidity to Negombo, Sri Lanka, than March, signifying the height of the warmer season. With the rise in temperature, locals and tourists can enjoy various water-based activities due to the warm sea temperature. April stands out for having an average rainfall of 112mm (4.41"). Despite the warm conditions, the city maintains a valuable amount of sunlight hours, providing substantial time for outdoor exploration. Wind speeds in April are moderate, contributing to the warm but comfortable weather.

Temperature

As Negombo welcomes April, the average high-temperature records at a still tropical 32°C (89.6°F), marking an insignificant deviation from the prior month. During the month of April, the temperature generally drops to a low average of 26°C (78.8°F).

Heat index

In April, the average heat index is computed to be a scorching 43°C (109.4°F). On guard: Heat exhaustion and heat cramps are predicted. Heatstroke is a potential hazard with continuous physical effort.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', reflects the feeling of heat when considering both air temperature and humidity. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
Humans rely on perspiration as a cooling mechanism, wherein the evaporating sweat counteracts excessive warmth. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

In April, the average relative humidity is 77%.

Rainfall

In Negombo, in April, it is raining for 23.4 days, with typically 112mm (4.41") of accumulated precipitation. Throughout the year, in Negombo, there are 265.4 rainfall days, and 1744mm (68.66") of precipitation is accumulated.

Sea temperature

The month with the warmest seawater is April, with an average sea temperature of 29.7°C (85.5°F).
Note: In any water activity, temperatures between 25°C (77°F) and 29°C (84.2°F) are viewed as magnificent and exceptionally pleasant for prolonged enjoyment.

Daylight

In Negombo, the average length of the day in April is 12h and 17min.
On the first day of April, sunrise is at 06:08 and sunset at 18:20. On the last day of the month, sunrise is at 05:56 and sunset at 18:19 +0530.

Sunshine

January through April, with an average of 9.2h of sunshine, are months with the most sunshine.

UV index

The months with the highest UV index are January through April, July, September, November and December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: In April, the average maximum UV index of 7 translates into the following recommendations:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Always opt for UVA and UVB-resistant sunglasses on radiant days. Beware! Reflections from sand and water can intensify the Sun's UV radiation.