May weather forecast
Rajagiriya, Sri Lanka

The last month of the spring, May, is another tropical month in Rajagiriya, Sri Lanka, with temperature in the range of an average high of 30.6°C (87.1°F) and an average low of 26.3°C (79.3°F).

Temperature

As Rajagiriya, Sri Lanka, welcomes May, the average high-temperature stabilizes at a still tropical 30.6°C (87.1°F), showing little deviation from April's 31.8°C (89.2°F). A mean low-temperature of 26.3°C (79.3°F) is a distinguishing feature of May in Rajagiriya, indicating a slight dip from daytime highs.

Heat index

In May, the average heat index is estimated at a blisteringly hot 40°C (104°F). Implement enhanced safety actions, heat cramps and heat exhaustion could occur. Sustained activity might result in heatstroke.
Always consider that heat index estimations are for light winds and places in the shade. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', shows a temperature sensation when both heat and moisture conditions are combined. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. 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 hold particular significance for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
The physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. 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. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

The average relative humidity in May is 81%.

Rainfall

In Rajagiriya, in May, it is raining for 28.8 days, with typically 306mm (12.05") of accumulated precipitation. Throughout the year, in Rajagiriya, Sri Lanka, there are 289.4 rainfall days, and 2262mm (89.06") of precipitation is accumulated.

Daylight

In May, the average length of the day in Rajagiriya is 12h and 26min.
On the first day of the month, sunrise is at 05:56 and sunset at 18:18. On the last day of May, in Rajagiriya, sunrise is at 05:53 and sunset at 18:23 +0530.

Sunshine

The average sunshine in May in Rajagiriya is 8.6h.

UV index

The months with the lowest UV index are May, June, August and October, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In May, the maximum UV index of 6 suggests these recommendations:
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. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.