May weather forecast
Polonnaruwa, Sri Lanka

May, the last month of the spring in Polonnaruwa, is another hot month, with an average temperature ranging between min 24.5°C (76.1°F) and max 34.2°C (93.6°F).

Temperature

In Polonnaruwa, Sri Lanka, the average high-temperature in May is essentially the same as in April - a still hot 34.2°C (93.6°F). In Polonnaruwa, the average low-temperature is 24.5°C (76.1°F).

Heat index

In May, the average heat index is computed to be a life-threatening hot 49°C (120.2°F). Be wary: Heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'feels like', or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like activity, differences in body mass, height, and shape, wind, and pregnancy affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
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 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 heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in May in Polonnaruwa, Sri Lanka, is 72%.

Rainfall

In Polonnaruwa, during May, the rain falls for 17.4 days and regularly aggregates up to 83mm (3.27") of precipitation. Throughout the year, there are 196.8 rainfall days, and 943mm (37.13") of precipitation is accumulated.

Daylight

The average length of the day in May in Polonnaruwa, Sri Lanka, is 12h and 29min.
On the first day of May in Polonnaruwa, Sri Lanka, sunrise is at 05:51 and sunset at 18:15. On the last day of the month, sunrise is at 05:47 and sunset at 18:20 +0530.

Sunshine

In Polonnaruwa, the average sunshine in May is 11.2h.

UV index

February through October, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for average individuals.
Note: In May, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.