May weather forecast
Keselwatta, Sri Lanka

The last month of the spring, May, is another tropical month in Keselwatta, Sri Lanka, with an average temperature varying between 26.3°C (79.3°F) and 30.2°C (86.4°F).

Temperature

The commencement of May records an average high-temperature of a still tropical 30.2°C (86.4°F), barely varying from April's 31.3°C (88.3°F). During the nights of May, Keselwatta maintains an almost steady temperature with an average low of 26.3°C (79.3°F).

Heat index

Throughout May, the heat index is appraised at a fiery hot 39°C (102.2°F). Preventive measures are required to mitigate the risk of heat cramps and heat exhaustion. Continuous activity may precipitate heatstroke.
When assessing, remember that heat index measurements are for light winds and shaded spots. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. 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 important for children. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Perspiring is the body's way of cooling down, particularly by allowing sweat to evaporate and take the heat with it. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

In May, the average relative humidity in Keselwatta is 81%.

Rainfall

In May, in Keselwatta, Sri Lanka, the rain falls for 28 days. Throughout May, 303mm (11.93") of precipitation is accumulated. Throughout the year, there are 273.8 rainfall days, and 2059mm (81.06") of precipitation is accumulated.

Daylight

The average length of the day in May in Keselwatta is 12h and 26min.
On the first day of May in Keselwatta, Sri Lanka, sunrise is at 05:56 and sunset at 18:18. On the last day of the month, sunrise is at 05:53 and sunset at 18:22 +0530.

Sunshine

The average sunshine in May is 8.7h.

UV index

May, June and August, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for average individuals.
Note: In May, a daily UV index of 6 turns into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. Always opt for UVA and UVB-resistant sunglasses on radiant days.