August weather forecast and climate
Colombo, Sri Lanka

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 August

August, the last month of the summer, in Colombo, is also a moderately hot month, with temperature in the range of an average high of 28.9°C (84°F) and an average low of 25.2°C (77.4°F).

Temperature

The coldest months are July and August, with an average high-temperature of 28.9°C (84°F).

Heat index

In August, the average heat index is calculated to be a torrid 35.1°C (95.2°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. 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', 'feels like', 'real feel', or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, wind, metabolic differences). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

Months with the highest humidity in Colombo are June through August, with an average relative humidity of 83%.

Rainfall

In Colombo, during 30.2 rainfall days, 287mm (11.3") of precipitation is typically accumulated. In Colombo, during the entire year, the rain falls for 289.4 days and collects up to 2262mm (89.06") of precipitation.

Sea temperature

August is the month with the coldest seawater, with an average sea temperature of 27.2°C (81°F).
Note: 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.

Daylight

In Colombo, the average length of the day in August is 12.3h.

Sunshine

In August, the average sunshine is 7h.

UV index

Months with the lowest UV index are May, June, August and October, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 6 in August interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 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. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the coldest month in Colombo?

The coldest months in Colombo are July and August, with an average high-temperature of 28.9°C (84°F).

What is the temperature in August in Colombo?

In Colombo, in August, the average high-temperature is 28.9°C (84°F), and the average low-temperature is 25.2°C (77.4°F). In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which represents the influence of relative humidity on air temperature, is calculated to be 35.1°C (95.2°F).

What are the most humid months in Colombo?

Months with the highest humidity in Colombo, Sri Lanka, are June through August, with an average relative humidity of 83%.

What is the average humidity in August in Colombo?

The average relative humidity in August is 83%.

How much does it rain in Colombo in August?

In Colombo, Sri Lanka, during August, the rain falls for 30.2 days and regularly aggregates up to 287mm (11.3") of precipitation.

When is the sea coldest in Colombo?

With an average sea temperature of 27.2°C (81°F), August is the month with the coldest seawater.

How warm is the water in August in Colombo?

In Colombo, Sri Lanka, the average seawater temperature in August is 27.2°C (81°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 August in Colombo?

In Colombo, the average length of the day in August is 12.3h.

How many hours of sunshine does Colombo have in August?

In August, the average sunshine in Colombo is 7h.

What is the month with the lowest UV index in Colombo?

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

What is the UV index intensity in August in Colombo?

The average daily maximum UV index in August in Colombo, Sri Lanka, is 6. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation.

Average temperature in August
Colombo, Sri Lanka

Average temperature in August - Colombo, Sri Lanka
  • Average high temperature in August: 28.9°C

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

  • Average low temperature in August: 25.2°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 August
Colombo, Sri Lanka

Average pressure in August - Colombo, Sri Lanka
  • Average pressure in August: 1009.1mbar

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 August
Colombo, Sri Lanka

Average wind speed in August - Colombo, Sri Lanka
  • Average wind speed in August: 14.2km/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 August
Colombo, Sri Lanka

Average humidity in August - Colombo, Sri Lanka
  • Average humidity in August: 83%

Months with the highest relative humidity are June, July and August (83%).
Months with the lowest relative humidity are January and February (74%).

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Average rainfall in August
Colombo, Sri Lanka

Average rainfall in August - Colombo, Sri Lanka
  • Average rainfall in August: 287mm

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 August
Colombo, Sri Lanka

Average rainfall days in August - Colombo, Sri Lanka
  • Average rainfall days in August: 30.2 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 August
Colombo, Sri Lanka

Average sea temperature in August - Colombo, Sri Lanka
  • Average sea temperature in August: 27.2°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 August /
Average sunshine in August
Colombo, Sri Lanka

Average daylight in August / Average sunshine in August - Colombo, Sri Lanka
  • Average daylight in August: 12.3h

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

  • Average sunshine in August: 7h

The month with the most sunshine is January (Average sunshine: 9.1h).
The month with the least sunshine is November (Average sunshine: 6.7h).

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Average sunshine days in August
Colombo, Sri Lanka

Average sunshine days in August - Colombo, Sri Lanka
  • Average sunshine days in August: 0.3 days

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

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Average UV index in August
Colombo, Sri Lanka

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

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

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Average cloud cover in August
Colombo, Sri Lanka

Average cloud cover in August - Colombo, Sri Lanka
  • Average cloud cover in August: 56

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 August
Colombo, Sri Lanka

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

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

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