Colombo
Sri Lanka
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Colombo, Sri Lanka

Statues on the Seema Malaka Temple in Colombo, Sri Lanka, overlooking the Beira Lake, and a view of the tall buildings of Colombo
Statues on the Seema Malaka Temple in Colombo, Sri Lanka, overlooking the Beira Lake, and a view of the tall buildings of Colombo
The last month of the spring, Mayo, is another tropical month in Colombo, Sri Lanka, with average temperature fluctuating between 31.1°C (88°F) and 25.5°C (77.9°F).

Temperature

In Mayo, the average high-temperature is relatively the same as in Abril - a still hot 31.1°C (88°F). In Mayo, the average low-temperature is 25.5°C (77.9°F).

Heat index

The average heat index is appraised at a scorching 40.5°C (104.9°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, metabolic differences, differences in body mass, height, and shape), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Colombo, the average relative humidity in Mayo is 78%.

Rainfall

In Colombo, it is raining for 16 days, with typically 392.4mm (15.45") of accumulated precipitation. In Colombo, Sri Lanka, during the entire year, the rain falls for 145 days and collects up to 2523.7mm (99.36") of precipitation.

Sea temperature

In Mayo, the average sea temperature in Colombo is 29.3°C (84.7°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In Mayo, the average length of the day in Colombo is 12.4h.

Sunshine

The average sunshine in Mayo is 6.5h.

UV index

Febrero through Octubre, with an average maximum UV index of 12, are months with the highest UV index. A UV Index estimate of 11, and higher, represents an extreme threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In Mayo, the average maximum UV index of 12 translate into the following recommendations:
Take all required precautions, as unprotected skin and eyes can burn in minutes. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in Mayo in Colombo?

The average high-temperature, in Mayo, in Colombo, Sri Lanka, is 31.1°C (88°F), while the average low-temperature is 25.5°C (77.9°F). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), that factores the actual air temperature with the relative humidity, in Mayo is calculated to 40.5°C (104.9°F).

What is the average humidity in Mayo in Colombo?

The average relative humidity in Mayo is 78%.

How many days does it rain in Mayo in Colombo?

In Colombo, in Mayo, during 16 rainfall days, 392.4mm (15.45") of precipitation is typically accumulated.

How warm is the water in Mayo in Colombo?

In Colombo, in Mayo, the average water temperature is 29.3°C (84.7°F). 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.

What is the average length of the day in Mayo in Colombo?

The average length of the day in Mayo in Colombo is 12.4h.

How many hours of sunshine does Colombo have in Mayo?

In Colombo, the average sunshine in Mayo is 6.5h.

When is the highest UV index in Colombo?

Months with the highest UV index in Colombo are Febrero through Octubre, with an average maximum UV index of 12.

What is the UV index intensity in Mayo in Colombo?

The average daily maximum UV index in Mayo in Colombo is 12. A UV Index value of 11, and more, symbolizes an excessive health risk from unprotected exposure to the UV radiation.
Average temperature in May - Colombo, Sri Lanka
  • Average high temperature in May: 31.1°C

The warmest month (with the highest average high temperature) is April (31.8°C).
Months with the lowest average high temperature are July, August and October (30°C).

  • Average low temperature in May: 25.5°C

Months with the highest average low temperature are May and June (25.5°C).
The coldest month (with the lowest average low temperature) is January (22.3°C).

Average humidity in May - Colombo, Sri Lanka
  • Average humidity in May: 78%

The month with the highest relative humidity is June (79%).
Months with the lowest relative humidity are January and February (69%).

Average rainfall in May - Colombo, Sri Lanka
  • Average rainfall in May: 392.4mm

The wettest month (with the highest rainfall) is November (414.4mm).
The driest month (with the lowest rainfall) is January (58.2mm).

Average rainfall days in May - Colombo, Sri Lanka
  • Average rainfall days in May: 16 days

The month with the highest number of rainy days is October (17 days).
Months with the lowest number of rainy days are January and February (5 days).

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).

Average daylight in May / Average sunshine in May - Colombo, Sri Lanka
  • Average daylight in May: 12.4h

Months with the longest days are June and July (Average daylight: 12.5h).
The month with shortest days is December (Average daylight: 11.7h).

  • Average sunshine in May: 6.5h

The month with most sunshine is March (Average sunshine: 8.9h).
The month with least sunshine is September (Average sunshine: 6.3h).

Average UV index in May - Colombo, Sri Lanka
  • Average UV index in May: 12

Months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
Months with the lowest UV index are January, November and December (UV index 11).