May weather forecast
Colombo, Sri Lanka

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Statues on the Seema Malaka Temple in Colombo, Sri Lanka, overlooking the Beira Lake
Statues on the Seema Malaka Temple in Colombo, Sri Lanka, overlooking the Beira Lake

Weather in May

May ushers in the wettest period in Colombo, with a staggering rainfall increase to 306mm (12.05"). The increase in cloud cover to 54% combined with a slight decrease in daylight hours could trigger a visually darker environment. Although the temperature during the day slightly decreases, evening temperatures continue to rise, resulting in very warm nights. May's weather creates an excellent opportunity for indoor activities and events, as outdoor adventures might be disrupted by the high rainfall and humidity. The relatively calm wind conditions might also be advantageous to those with outdoor plans.

Temperature

The transition into May shows a subtle variation to a still tropical 30.6°C (87.1°F) from April's 31.8°C (89.2°F) in the average high-temperature. May nights in Colombo, Sri Lanka, register a minor temperature decline, steadying at a warm 26.3°C (79.3°F).

Heat index

During May, the heat index is computed to be a blisteringly hot 40°C (104°F). Implement more safety precautions, heat cramps and heat exhaustion may happen. Persistent activity could induce heatstroke.
When referencing the heat index, its values are suitable for shady environments and light breezes. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', melds the effects of warmth and moisture to generate a feeling of heat. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
Perspiration and the resultant sweat evaporation are the body's natural thermostat, helping regulate temperature. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

The average relative humidity in May in Colombo is 81%.

Rainfall

In Colombo, in May, during 28.8 rainfall days, 306mm (12.05") of precipitation is typically accumulated. Throughout the year, there are 289.4 rainfall days, and 2262mm (89.06") of precipitation is accumulated.

Sea temperature

In May, the average sea temperature in Colombo is 29.3°C (84.7°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

The average length of the day in May in Colombo is 12h and 26min.
On the first day of the month, sunrise is at 05:56 and sunset at 18:18. On the last day of May, sunrise is at 05:53 and sunset at 18:23 +0530.

Sunshine

The average sunshine in May is 8.6h.

UV index

May, June, August and October, with an average maximum UV index of 6, are months with the lowest UV index in Colombo. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: The UV index of 6 during May translates into the following guidance:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. 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. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Caution! The Sun's UV rays become stronger due to reflections from water and sand.
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Frequently asked questions

How hot does it get in Colombo in May?

An average high-temperature, in May, in Colombo, is 30.6°C (87.1°F) and the average low-temperature is 26.3°C (79.3°F). In May, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 40°C (104°F).

What is the average humidity in May in Colombo?

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

How many days does it rain in May in Colombo?

In Colombo, in May, during 28.8 rainfall days, 306mm (12.05") of precipitation is typically accumulated.

What is the water temperature in May in Colombo?

In May, the average sea temperature in Colombo 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.

How many hours of daylight does Colombo have in May?

In Colombo, Sri Lanka, the average day length in May is 12h and 26min.

What time are sunrise and sunset in May in Colombo?

In May, on the first day of the month, sunrise is at 05:56 and sunset at 18:18. On the last day of the month, in Colombo, sunrise is at 05:53 and sunset at 18:23 +0530.

How many hours of sunshine does Colombo have in May?

In Colombo, the average sunshine duration in May is 8.6h.

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

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

What is the UV index intensity in May in Colombo?

In Colombo, Sri Lanka, the average daily maximum UV index in May is 6. A UV Index reading of 6 to 7 represents a high hazard to health from exposure to Sun's UV rays.

Average temperature in May
Colombo, Sri Lanka

Average temperature in May - Colombo, Sri Lanka
  • Average high temperature in May: 30.6°C

The warmest months (with the highest average high temperature) are March and April (31.8°C).
The months with the lowest average high temperature are July and August (28.9°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 (23.1°C).

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Average pressure in May
Colombo, Sri Lanka

Average pressure in May - Colombo, Sri Lanka
  • Average pressure in May: 1008.6mbar

The month with the highest atmospheric pressure is January (1011.6mbar).
The month with the lowest atmospheric pressure is May (1008.6mbar).

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Average wind speed in May
Colombo, Sri Lanka

Average wind speed in May - Colombo, Sri Lanka
  • Average wind speed in May: 12.9km/h

The windiest month (with the highest average wind speed) is June (15.1km/h).
The calmest month (with the lowest average wind speed) is March (8km/h).

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Average humidity in May
Colombo, Sri Lanka

Average humidity in May - Colombo, 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 (74%).

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Average rainfall in May
Colombo, Sri Lanka

Average rainfall in May - Colombo, Sri Lanka
  • Average rainfall in May: 306mm

The wettest month (with the highest rainfall) is June (341mm).
The driest month (with the least rainfall) is January (40mm).

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Average rainfall days in May
Colombo, Sri Lanka

Average rainfall days in May - Colombo, Sri Lanka
  • Average rainfall days in May: 28.8 days

The month with the highest number of rainy days is August (30.2 days).
The month with the least rainy days is January (11.6 days).

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Average sea temperature in May
Colombo, Sri Lanka

Average sea temperature in May - Colombo, 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
Colombo, Sri Lanka

Average daylight in May / Average sunshine in May - Colombo, 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 6min).
The month with the least sunshine is November (Average sunshine: 6h and 42min).

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Average sunshine days in May
Colombo, Sri Lanka

Average sunshine days in May - Colombo, Sri Lanka
  • Average sunshine days in May: 1.3 days

The month with the most sunshine days is January (17.2 days).
The months with the least sunshine days are June and August (0.3 days).

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Average UV index in May
Colombo, Sri Lanka

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

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

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Average cloud cover in May
Colombo, Sri Lanka

Average cloud cover in May - Colombo, Sri Lanka
  • Average cloud cover in May: 54

The month with the most cloud cover is June (Cloud cover 57).
The month with the least cloud cover is January (Cloud cover 24).

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Average visibility in May
Colombo, Sri Lanka

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

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

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Colombo, Sri Lanka

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