May weather forecast
Moratuwa, Sri Lanka

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Weather in May

May in Moratuwa marks the onset of the monsoon season, with the environment turning increasingly wet and humid. Conditions remain conducive to flora, lending a verdant look to the city. May's weather, although humid, continues to offer a good amount of daylight and consistent visibility. A remarkable feature of the month's weather is the heaviest rainfall of the year, clocking in at 303mm (11.93"). Consequently, the month experiences numerous wet-days, complemented by a subtle drop in wind speed.

Temperature

Moratuwa starts May with an average high-temperature of a still tropical 30.2°C (86.4°F), a minor shift from April's 31.3°C (88.3°F). Throughout May, Moratuwa's nights experience a slight temperature dip to a warm 26.3°C (79.3°F).

Heat index

During May, the heat index is appraised at a sweltering 39°C (102.2°F). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
Observations indicate that the heat index values are for shady locations with light wind. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. Heightened relative humidity interferes with the body's usual cooling mechanism by reducing evaporation, subsequently decreasing the body's cooling rate and increasing the sensation of heat. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

In Moratuwa, Sri Lanka, the average relative humidity in May is 81%.

Rainfall

In Moratuwa, during May, the rain falls for 28 days and regularly aggregates up to 303mm (11.93") of precipitation. In Moratuwa, during the entire year, the rain falls for 273.8 days and collects up to 2059mm (81.06") of precipitation.

Sea temperature

In Moratuwa, the average seawater temperature in May is 29.3°C (84.7°F).
Note: A water temperature from 25°C (77°F) to 29°C (84.2°F) is considered very warm and enjoyable, allowing water activities to be pleasant for extended periods without irritation.

Daylight

In Moratuwa, the average length of the day in May is 12h and 26min.
On the first day of May, sunrise is at 05:56 and sunset at 18:18. On the last day of the month, sunrise is at 05:53 and sunset at 18:22 +0530.

Sunshine

In Moratuwa, the average sunshine in May is 8.7h.

UV index

The months with the lowest UV index are May, June and August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index of 6 in May converts into the following recommendations:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Beware! Reflecting off water and sand, UV rays are much stronger.
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Frequently asked questions

How hot is May in Moratuwa?

May temperatures in Moratuwa, Sri Lanka, vary between a high-temperature of 30.2°C (86.4°F) and a low-temperature of 26.3°C (79.3°F). In May, the average heat index (a.k.a. 'feels like', 'real feel'), which represents the influence of relative humidity on air temperature, is appraised at 39°C (102.2°F).

What is the average humidity in May in Moratuwa?

The average relative humidity in May is 81%.

How many days does it rain in May in Moratuwa?

In Moratuwa, Sri Lanka, during May, the rain falls for 28 days and regularly aggregates up to 303mm (11.93") of precipitation.

How warm is the water in May in Moratuwa?

In Moratuwa, in May, the average water temperature is 29.3°C (84.7°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in May in Moratuwa?

The average day length in May in Moratuwa is 12h and 26min.

When are sunrise and sunset in May in Moratuwa?

On the first day of May in Moratuwa, Sri Lanka, sunrise is at 05:56 and sunset at 18:18. On the last day of the month, sunrise is at 05:53 and sunset at 18:22 +0530.

How long on average sun shines in May in Moratuwa?

In May, the average sunshine duration in Moratuwa is 8.7h.

What are the months with the lowest UV index in Moratuwa?

May, June and August, with an average maximum UV index of 6, are months with the lowest UV index in Moratuwa, Sri Lanka.

What is the UV index reading in May in Moratuwa?

The average daily maximum UV index in May is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from exposure to Sun's UV rays.

Average temperature in May
Moratuwa, Sri Lanka

Average temperature in May - Moratuwa, Sri Lanka
  • Average high temperature in May: 30.2°C

The warmest months (with the highest average high temperature) are March and April (31.3°C).
The month with the lowest average high temperature is August (28.6°C).

  • Average low temperature in May: 26.3°C

The month with the highest average low temperature is May (26.3°C).
The coldest month (with the lowest average low temperature) is January (23.4°C).

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Average pressure in May
Moratuwa, Sri Lanka

Average pressure in May - Moratuwa, Sri Lanka
  • Average pressure in May: 1008.7mbar

The month with the highest atmospheric pressure is January (1011.6mbar).
The month with the lowest atmospheric pressure is May (1008.7mbar).

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Average wind speed in May
Moratuwa, Sri Lanka

Average wind speed in May - Moratuwa, Sri Lanka
  • Average wind speed in May: 13.3km/h

The windiest month (with the highest average wind speed) is June (15.9km/h).
The calmest month (with the lowest average wind speed) is March (7.9km/h).

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Average humidity in May
Moratuwa, Sri Lanka

Average humidity in May - Moratuwa, Sri Lanka
  • Average humidity in May: 81%

The months with the highest relative humidity are June, July and August (83%).
The months with the lowest relative humidity are January and February (75%).

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Average rainfall in May
Moratuwa, Sri Lanka

Average rainfall in May - Moratuwa, Sri Lanka
  • Average rainfall in May: 303mm

The wettest month (with the highest rainfall) is June (350mm).
The driest month (with the least rainfall) is January (25mm).

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Average rainfall days in May
Moratuwa, Sri Lanka

Average rainfall days in May - Moratuwa, Sri Lanka
  • Average rainfall days in May: 28 days

The months with the highest number of rainy days are July and August (29.5 days).
The month with the least rainy days is January (8.9 days).

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Average sea temperature in May
Moratuwa, Sri Lanka

Average sea temperature in May - Moratuwa, Sri Lanka
  • Average sea temperature in May: 29.3°C

The best month for swimming (with the highest average sea temperature) is April (29.6°C).
The coldest month (with the lowest average sea temperature) is August (27.2°C).

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Average daylight in May /
Average sunshine in May
Moratuwa, Sri Lanka

Average daylight in May / Average sunshine in May - Moratuwa, Sri Lanka
  • Average daylight in May: 12h and 2min

The month with the longest days is June (Average daylight: 12h and 30min).
The month with the shortest days is December (Average daylight: 11h and 42min).

  • Average sunshine in May: 8h and 4min

The month with the most sunshine is January (Average sunshine: 9h and 12min).
The month with the least sunshine is November (Average sunshine: 6h and 48min).

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Average sunshine days in May
Moratuwa, Sri Lanka

Average sunshine days in May - Moratuwa, Sri Lanka
  • Average sunshine days in May: 1.2 days

The month with the most sunshine days is January (21 days).
The months with the least sunshine days are June and July (0.3 days).

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Average UV index in May
Moratuwa, Sri Lanka

Average UV index in May - Moratuwa, Sri Lanka
  • Average UV index in May: 6

The months with the highest UV index are January, February, March, April, July, September, October, November and December (UV index 7).
The months with the lowest UV index are May, June and August (UV index 6).

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Average cloud cover in May
Moratuwa, Sri Lanka

Average cloud cover in May - Moratuwa, Sri Lanka
  • Average cloud cover in May: 52

The month with the most cloud cover is June (Cloud cover 55).
The month with the least cloud cover is January (Cloud cover 24).

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Average visibility in May
Moratuwa, Sri Lanka

Average visibility in May - Moratuwa, Sri Lanka
  • Average visibility in May: 9km

The months with the highest visibility are January, February, March, April, November and December (10km).
The months with the lowest visibility are May, June, July, August, September and October (9km).

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Moratuwa, Sri Lanka

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