May weather forecast
Negombo, Sri Lanka

May in Negombo, Sri Lanka, continues to display warm temperatures; however, an upward shift in rainfall can be observed. Despite the increase in rainfall, sunshine persists, enabling continuous outdoor activities. There is a slight elevation in wind speeds, which maintains a refreshing atmosphere amidst the higher temperature and relative humidity. The humid conditions encourage luxuriant vegetation growth around the city. The daylight hours continue to be long, providing ample time for activities.

Temperature

May ushers in an average high-temperature of a still tropical 30.8°C (87.4°F), aligning closely with the preceding month. May is characterized by a steady nighttime low-temperature of 26.4°C (79.5°F).

Heat index

In May, the average heat index is computed to be a blistering 40°C (104°F). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.
Understand that the heat index values take into account shaded locations and mild winds. 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 'feels like' or 'apparent temperature', is achieved by amalgamating air temperature with the relative humidity readings. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

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

Rainfall

In May, the rain falls for 26.3 days. Throughout May, 204mm (8.03") of precipitation is accumulated. In Negombo, Sri Lanka, during the entire year, the rain falls for 265.4 days and collects up to 1744mm (68.66") of precipitation.

Sea temperature

In Negombo, in May, the average water temperature is 29.3°C (84.7°F).
Note: Between the temperatures of 25°C (77°F) and 29°C (84.2°F), water is considered very warm, providing pleasure in water activities without discomfort over lengthy periods.

Daylight

The average length of the day in May is 12h and 27min.
On the first day of the month, sunrise is at 05:56 and sunset at 18:19. On the last day of May, in Negombo, sunrise is at 05:52 and sunset at 18:23 +0530.

Sunshine

In May, the average sunshine is 8.8h.

UV index

The months with the lowest UV index in Negombo are May, June, August and October, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 6 in May interprets into the following advice:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Warning! Reflective surfaces like sand and water amplify the Sun's UV radiation.