May weather forecast
Walahanduwa, Sri Lanka

The last month of the spring, May, is also a moderately hot month in Walahanduwa, Sri Lanka, with an average temperature fluctuating between 29.5°C (85.1°F) and 26.7°C (80.1°F).

Temperature

The introduction of May sees an average high-temperature of a warm 29.5°C (85.1°F), hardly deviating from April. Walahanduwa maintains a consistent average nighttime low-temperature of 26.7°C (80.1°F) throughout May.

Heat index

May's mean heat index is evaluated at a sweltering 36°C (96.8°F). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.
Data suggests that the heat index is set for environments in shade and with a light wind. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. When relative humidity is heightened, it slows the rate of evaporation, thereby decreasing the body's ability to shed heat and creating a sensation of overheating. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

The average relative humidity in May is 81%.

Rainfall

The month with the most rainfall is May, when the rain falls for 27.7 days and typically aggregates up to 302mm (11.89") of precipitation.

Daylight

In Walahanduwa, the average length of the day in May is 12h and 24min.
On the first day of the month, sunrise is at 05:55 and sunset at 18:16. On the last day of May, sunrise is at 05:53 and sunset at 18:20 +0530.

Sunshine

In Walahanduwa, the average sunshine in May is 9h.

UV index

The months with the lowest UV index are May and September, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 6 during May translates into the following guidance:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.