May weather forecast
Hedeniya, Sri Lanka

The last month of the spring, May, is another tropical month in Hedeniya, Sri Lanka, with an average temperature fluctuating between 30.1°C (86.2°F) and 21.8°C (71.2°F).

Temperature

With the onset of May, a modest change to a still tropical 30.1°C (86.2°F) from April's 31.2°C (88.2°F) is noted in high-temperature. An average low-temperature of 21.8°C (71.2°F) is recorded during the nights in May in Hedeniya, Sri Lanka.

Heat index

For most parts of May, the heat index is estimated at a very hot 38°C (100.4°F). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'feels like', determines the feeling of heat when you account for the relative humidity. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. When the level of relative humidity is elevated, evaporation diminishes, causing more warmth to be retained in the body than in dry air. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

The average relative humidity in May in Hedeniya, Sri Lanka, is 80%.

Rainfall

In Hedeniya, in May, it is raining for 28.6 days, with typically 163mm (6.42") of accumulated precipitation. Throughout the year, in Hedeniya, there are 278.4 rainfall days, and 1466mm (57.72") of precipitation is accumulated.

Daylight

In May, the average length of the day in Hedeniya, Sri Lanka, is 12h and 28min.
On the first day of the month, sunrise is at 05:53 and sunset at 18:16. On the last day of May, sunrise is at 05:49 and sunset at 18:21 +0530.

Sunshine

The average sunshine in May is 10.4h.

UV index

The months with the highest UV index in Hedeniya are January through September, November and December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: In May, the maximum UV index of 6 translates into these guidelines:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.