August weather forecast
Colombo, Sri Lanka

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.