April weather forecast
Kalawana, Sri Lanka

April, the same as March, in Kalawana, Sri Lanka, is a hot spring month, with temperature in the range of an average high of 30°C (86°F) and an average low of 21.1°C (70°F).

Temperature

The advent of April observes an average high-temperature of a still tropical 30°C (86°F), nearly identical to March's 31.1°C (88°F). Kalawana records an average low-temperature of 21.1°C (70°F) throughout the month of April.

Heat index

April's average heat index is estimated at a sweltering 39°C (102.2°F). Take more preventive steps, risk of heat exhaustion and heat cramps is elevated. Long activity may culminate in heatstroke.
Observations indicate that the heat index values are for shady locations with light wind. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is an aggregate value of air's warmth and moisture to show the human-felt temperature. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

In Kalawana, the average relative humidity in April is 86%.

Rainfall

In Kalawana, during April, the rain falls for 29.4 days and regularly aggregates up to 248mm (9.76") of precipitation. In Kalawana, during the entire year, the rain falls for 317.3 days and collects up to 2422mm (95.35") of precipitation.

Daylight

The average length of the day in April is 12h and 16min.
On the first day of April, sunrise is at 06:06 and sunset at 18:17. On the last day of the month, sunrise is at 05:55 and sunset at 18:16 +0530.

Sunshine

With an average of 8.4h of sunshine, April has the most sunshine of the year.

UV index

The months with the highest UV index in Kalawana are January through August, November and December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The UV index of 6 in April translates into these instructions:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.