May weather forecast
Kalutara, Sri Lanka

In May, Kalutara transitions into the monsoon season, marked by an upsurge in humidity and rainfall. This month records the highest rainfall of 303mm (11.93"), indicating the peak of the rainy season. Despite the high levels of precipitation, the temperatures remain relatively constant and warm. With continuous rainfall and cloudiness, May sees a dip in sunshine hours disrupting the well-known bright days of Kalutara. Therefore, this month is less favorable for outdoor activities compared to the previous four months.

Temperature

With the onset of May, the average high-temperature stands at a still hot 30.2°C (86.4°F), closely aligned with April's 31.3°C (88.3°F). Kalutara maintains a consistent average nighttime low-temperature of 26.3°C (79.3°F) throughout May.

Heat index

The heat index value for May is evaluated at a fiery hot 39°C (102.2°F). Exercise heightened safety, heat cramps and heat exhaustion are probable. Persistent activity may provoke heatstroke.
The standards for the heat index are set for locations in shade and under light breezes. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is an estimation of the warmth sensation when considering humidity levels. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. Higher relative humidity impedes evaporation, thus reducing heat dispersion from the body, culminating in a sensation of overheating. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

In May, the average relative humidity is 81%.

Rainfall

In May, the rain falls for 28 days. Throughout May, 303mm (11.93") of precipitation is accumulated. Throughout the year, there are 273.8 rainfall days, and 2059mm (81.06") of precipitation is accumulated.

Sea temperature

In Kalutara, in May, the average water temperature is 29.3°C (84.7°F).
Note: Water activities in surface temperatures between 25°C (77°F) and 29°C (84.2°F) are seen as exceptional and extremely agreeable for lengthened time spans.

Daylight

In May, the average length of the day in Kalutara is 12h and 25min.
On the first day of the month, sunrise is at 05:56 and sunset at 18:17. On the last day of May, sunrise is at 05:53 and sunset at 18:22 +0530.

Sunshine

In May, the average sunshine is 8.7h.

UV index

May, June and August, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The average daily UV index of 6 in May transforms into the following instructions:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Attention! The combination of sand and water reflections enhances UV ray intensity.