July weather forecast
Colombo, Sri Lanka

By July, the weather in Colombo starts to shift, with rainfall quantity reducing to 256mm (10.08"). Despite this decrease, the city keeps its high levels of humidity at 83%. As daytime temperatures maintain their stability around 28.9°C (84°F), evening temperatures begin to cool slightly. Sunshine hours dip slightly, but daylight remains high, facilitating potential early evening plans. The calm sea and minimal wind might also provide quiet sailing or boating excursions.

Temperature

Colombo experiences the lowest of its temperatures in July and August, when the average high-temperatures rise to 28.9°C (84°F).

Heat index

The heat index value during July is computed to be a fiery hot 35°C (95°F). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Heat index values are typically calculated for conditions of shade and a light breeze. 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' or 'feels like', is found by incorporating humidity levels into the air temperature measurement. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

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

Rainfall

In Colombo, in July, during 29.8 rainfall days, 256mm (10.08") of precipitation is typically accumulated. In Colombo, Sri Lanka, during the entire year, the rain falls for 289.4 days and collects up to 2262mm (89.06") of precipitation.

Sea temperature

In Colombo, the average seawater temperature in July is 27.3°C (81.1°F).
Note: Surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as excellent and extremely agreeable for enduring enjoyment in water activities.

Daylight

The average length of the day in July in Colombo is 12h and 29min.
On the first day of July, sunrise is at 05:58 and sunset at 18:30. On the last day of the month, sunrise is at 06:04 and sunset at 18:29 +0530.

Sunshine

The average sunshine in July in Colombo is 7.6h.

UV index

The months with the highest UV index in Colombo, Sri Lanka, are January through April, July, September, November and December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum high daily UV index of 7 during July translates into the following directions:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Take note! Sand and water reflections strengthen the Sun's UV exposure.