May weather forecast
Chilaw, Sri Lanka

May, the last month of the spring in Chilaw, is also a hot month, with temperature in the range of an average high of 30.8°C (87.4°F) and an average low of 26.4°C (79.5°F).

Temperature

Chilaw's average high-temperature in May sits at a still hot 30.8°C (87.4°F), showing little difference from the previous month. A consistent average low-temperature of 26.4°C (79.5°F), with a minor variance from the daytime highs, is noted in Chilaw during the nights of May.

Heat index

The average heat index in May is appraised at a blistering 40°C (104°F). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.
Metrics for the heat index primarily focus on shaded spots and light wind conditions. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.
Evaporation of sweat is the main factor behind the cooling effect of perspiration in the human body. Increased relative humidity slows down evaporation, thereby decreasing the rate of heat removal from the body, culminating in a sensation of overheating. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

In May, the average relative humidity is 80%.

Rainfall

In Chilaw, in May, it is raining for 26.3 days, with typically 204mm (8.03") of accumulated precipitation. In Chilaw, during the entire year, the rain falls for 265.4 days and collects up to 1744mm (68.66") of precipitation.

Sea temperature

In Chilaw, Sri Lanka, the average seawater temperature in May is 29.4°C (84.9°F).
Note: Water temperatures from 25°C (77°F) to 29°C (84.2°F) make swimming, diving, and similar activities highly pleasurable and enjoyable for long periods without discomfort.

Daylight

In Chilaw, the average length of the day in May is 12h and 28min.
On the first day of May, sunrise is at 05:56 and sunset at 18:19. On the last day of the month, sunrise is at 05:52 and sunset at 18:24 +0530.

Sunshine

In May, the average sunshine is 8.8h.

UV index

May, June, August and October, 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 exposure to the Sun's UV rays for the average person.
Note: A maximum daily UV index of 6 during May morphs into the following directions:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be mindful! Sand and water reflections can up the Sun's UV exposure.