May weather forecast
Wattala, Sri Lanka

The last month of the spring, May, is also a hot month in Wattala, Sri Lanka, with an average temperature fluctuating between 26.3°C (79.3°F) and 30.6°C (87.1°F).

Temperature

The commencement of May brings an average high-temperature of a still tropical 30.6°C (87.1°F), marking an inconsequential divergence from April. Wattala experiences a minimal drop from daytime high temperatures, recording an average low-temperature of 26.3°C (79.3°F) throughout May.

Heat index

During May, the heat index is evaluated at an extremely hot 40°C (104°F). Implement additional cautionary measures, heat cramps and heat exhaustion could occur. Prolonged activity might induce heatstroke.
Records show heat index calculations are tailored for shaded regions and mild winds. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', marries air temperature and humidity to produce a value illustrating perceived warmth. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. With high air temperature and humidity (high heat index) conditions, sweat production is restricted, leading to an amplified perception of heat. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

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

Rainfall

In Wattala, in May, during 28.8 rainfall days, 306mm (12.05") of precipitation is typically accumulated. Throughout the year, there are 289.4 rainfall days, and 2262mm (89.06") of precipitation is accumulated.

Sea temperature

In Wattala, in May, the average water temperature is 29.3°C (84.7°F).
Note: Water temperatures ranging between 25°C (77°F) and 29°C (84.2°F) are regarded as very warm, making swimming, diving, and similar water activities pleasurable for extended periods.

Daylight

In May, the average length of the day 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 Wattala, sunrise is at 05:53 and sunset at 18:23 +0530.

Sunshine

The average sunshine in May 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 reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the average person.
Note: In May, the maximum UV index of 6 suggests this advice:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Notice! The reflection of water and sand increases the UV radiation significantly.