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

Galle's average high-temperature in May is a warm 29.5°C (85.1°F), indicating a subtle variation from April. Galle, during May nights, observes a steady temperature, averaging at 26.7°C (80.1°F).

Heat index

For May, the heat index is appraised at a torrid 36°C (96.8°F). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
Keep in mind the heat index values are meant for areas in shade and with light wind. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are highly important for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. In high relative humidity, the body's ability to evaporate heat is diminished, resulting in a heightened feeling of warmth. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.

Humidity

In May, the average relative humidity 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.

Sea temperature

In May, the average sea temperature is 29.1°C (84.4°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) provides warmth and pleasure, making water activities enjoyable for lengthened periods without feeling uncomfortable.

Daylight

In May, the average length of the day is 12h and 24min.
On the first day of the month, sunrise is at 05:56 and sunset at 18:16. On the last day of May, 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 health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In May, a daily maximum UV index of 6 leads to the following instructions:
Shield from overexposure. Defense against sun-related harm is required. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Beware! Reflecting off water and sand, UV rays are much stronger.