June weather forecast
Kolonnawa, Sri Lanka

The first month of the summer, June, is also a moderately hot month in Kolonnawa, Sri Lanka, with an average temperature varying between 25.8°C (78.4°F) and 29.3°C (84.7°F).

Temperature

June's weather records an average high-temperature of a warm 29.3°C (84.7°F), showing little deviation from May. June nights register a minor temperature decline, steadying at a still moderately hot 25.8°C (78.4°F).

Heat index

June's average heat index is estimated at a fiery hot 36°C (96.8°F). Incorporate additional safety actions, heat cramps and heat exhaustion are possible. Long-term activity may induce heatstroke.
Consider that heat index readings are for situations in the shade and light wind. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

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

Rainfall

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

Daylight

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

Sunshine

In June, the average sunshine is 8h.

UV index

The months with the lowest UV index are May, June, August and October, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: A maximum UV index of 6 in June translates into the following recommendations:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.