May weather forecast
Galle, Sri Lanka

In May there is a significant increase in rainfall within the city of Galle. Residents transition into a weather period characterized by heavier rains, reaching up to 302mm (11.89"). Concurrently, the days in May are rather gloomy, with sunshine being less prevalent than in the past months. Compared to April, the sea temperature also drops slightly, although it remains enjoyable for water pursuits. Despite the heavier rain, the temperature, both sea and climate, remain wonderfully tropical for those who venture outdoors.

Temperature

The advent of May observes an average high-temperature of a warm 29.5°C (85.1°F), nearly identical to April's 30.3°C (86.5°F). During May, Galle's temperature shows a minor deviation from daytime highs, falling to a steady low-temperature average of 26.7°C (80.1°F).

Heat index

The average heat index in May is evaluated at a sweltering 36°C (96.8°F). Exercise extra preventive actions, heat cramps and heat exhaustion are plausible. Continuous activity could result in heatstroke.
Remember that heat index calculations are made for conditions in the shade with light wind. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

The average relative humidity in May is 81%.

Rainfall

May is the month with the most rainfall in Galle, Sri Lanka. Rain falls for 27.7 days and accumulates 302mm (11.89") of precipitation.

Sea temperature

In Galle, in May, the average water temperature is 29.1°C (84.4°F).
Note: In water temperatures ranging between 25°C (77°F) and 29°C (84.2°F), activities such as swimming and diving become highly pleasurable for long durations.

Daylight

In Galle, the average length of the day in May is 12h and 24min.
On the first day of May, sunrise is at 05:56 and sunset at 18:16. On the last day of the month, sunrise is at 05:53 and sunset at 18:20 +0530.

Sunshine

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

UV index

May and September, 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 threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In May, the UV index of 6 transforms into the following advice:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. During bright days, sunglasses that offer UVA and UVB defense are recommended. Alert! The Sun's UV rays are heightened by the reflection of sand and water.