August 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 August

In August, Colombo sees another increase in rainfall to 287mm (11.3"), although temperature conditions remain relatively stable. With humidity remaining at a constant 83%, conditions continue to feel damp and heavy. Wind conditions persist, showing little change from July, ideal for relaxed outings in the park. Despite these conditions, Colombo's appeal as a vibrant city with much to offer is undeniable.

Temperature

During July and August, Colombo experiences its lowest temperatures, averaging a high-temperature of 28.9°C (84°F).

Heat index

The heat index value for August is computed to be a torrid 35°C (95°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is the outcome of merging air's temperature and its humidity metrics. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. With a high level of moisture in the air, the evaporation process becomes less efficient, preventing the body from cooling down efficiently and resulting in a sensation of overheating. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

June through August, with an average relative humidity of 83%, are the most humid months in Colombo.

Rainfall

In Colombo, during August, the rain falls for 30.2 days and regularly aggregates up to 287mm (11.3") of precipitation. Throughout the year, there are 289.4 rainfall days, and 2262mm (89.06") of precipitation is accumulated.

Sea temperature

August is the month with the coldest seawater, with an average sea temperature of 27.2°C (81°F).
Note: Temperatures between 25°C (77°F) and 29°C (84.2°F) in water are ideal for swimming, diving, and other activities, providing enjoyment and comfort for extended durations.

Daylight

In August, the average length of the day in Colombo is 12h and 20min.
On the first day of August, sunrise is at 06:04 and sunset at 18:29. On the last day of the month, sunrise is at 06:03 and sunset at 18:18 +0530.

Sunshine

In August, the average sunshine is 7h.

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 value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: In August, the maximum UV index of 6 suggests these recommendations:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Caution! Sand and water reflections can notably increase the UV radiation intensity.
Updated: Feb 6, 2024 | Published by: Weather Atlas | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What are the coldest months in Colombo?

During July and August, Colombo registers its lowest temperatures, averaging a high of 28.9°C (84°F).

How hot does it get in Colombo in August?

In August, the average high-temperature and low-temperature in Colombo are 28.9°C (84°F) and 25.2°C (77.4°F) respectively. The average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines relative humidity and air temperature, in August is computed to be 35°C (95°F).

What are the most humid months in Colombo?

June through August, with an average relative humidity of 83%, are most humid months in Colombo.

What is the average humidity in August in Colombo?

In August, the average relative humidity is 83%.

How many days does it rain in August in Colombo?

In Colombo, Sri Lanka, in August, it is raining for 30.2 days, with typically 287mm (11.3") of accumulated precipitation.

What month is the sea coldest in Colombo?

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

What is the water temperature in August in Colombo?

In Colombo, in August, the average water temperature is 27.2°C (81°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.

How many hours of daylight does Colombo have in August?

The average day length in August in Colombo is 12h and 20min.

When is the sunrise / sunset in August in Colombo?

In August, on the first day of the month, sunrise is at 06:04 and sunset at 18:29. On the last day of the month, in Colombo, Sri Lanka, sunrise is at 06:03 and sunset at 18:18 +0530.

How many hours of sunshine does Colombo have in August?

The average sunshine duration in August is 7h.

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

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

How high is the UV index in August in Colombo?

In Colombo, the average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high health threat from exposure to Sun's UV rays.

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).
The 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).

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).

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).

Average humidity in August
Colombo, Sri Lanka

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

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%).

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).

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).

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).

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: 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 August: 7h and 0min

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).

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).
The months with the least sunshine days are June and August (0.3 days).

Average UV index in August
Colombo, Sri Lanka

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

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).

Average visibility in August
Colombo, Sri Lanka

Average visibility in August - Colombo, Sri Lanka
  • Average visibility in August: 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).

Colombo, Sri Lanka

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