June weather forecast
Colombo, Sri Lanka

The month of June sees rainfall levels stay above average, as 341mm (13.43") precipitation is recorded throughout the month in Colombo. Outdoor activities can still be enjoyed with over 12.5 hours of daylight, the highest for the year. Spectacular view of the cloud formations at 57% cloud cover is a treat for sky-gazers. Sea temperatures start decreasing, signaling the end of the swimming season. However, the very calm wind conditions may not be ideal for water sport enthusiasts.

Temperature

As Colombo welcomes June, the average high-temperature stabilizes at a warm 29.3°C (84.7°F), showing little deviation from May's 30.6°C (87.1°F). Colombo maintains a consistent average nighttime low-temperature of 25.8°C (78.4°F) throughout June.

Heat index

For June, the heat index is computed to be a fiery hot 36°C (96.8°F). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', quantifies the warmth felt when relative humidity is considered. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
Evaporating sweat is a key way the human body dispels excessive warmth, all thanks to the process of perspiration. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

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

Rainfall

June is the month with the most rainfall in Colombo, Sri Lanka. Rain falls for 29.3 days and accumulates 341mm (13.43") of precipitation.

Sea temperature

In June, the average sea temperature in Colombo is 28.2°C (82.8°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

With an average of 12h and 30min of daylight, June has the longest days of the year in Colombo.
On the first day of the month, sunrise is at 05:53 and sunset at 18:23. On the last day of June, in Colombo, Sri Lanka, sunrise is at 05:58 and sunset at 18:29 +0530.

Sunshine

In Colombo, the average sunshine in June is 8h.

UV index

May, June, August and October, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: In June, a daily maximum UV index of 6 leads to the following instructions:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.