June weather forecast
Kalutara, Sri Lanka

June is a unique month in Kalutara weather calendar due to its continual high rainfall comparable to May's magnitude which aggregates to 350mm (13.78"). Temperature and humidity maintain their levels, still providing a very warm climate. Due to the dominating monsoon, activities related to sunshine are less likely to be encouraged, as June observes minimal sunshine days. Despite the monsoon, periodic glimpses of the sun and longer daylight hours are a norm.

Temperature

The onset of June brings an average high-temperature of a warm 29.2°C (84.6°F), nearly matching the May temperature. Kalutara's nighttime temperatures in June settle close to daytime highs at an average of 26.1°C (79°F).

Heat index

June's average heat index is evaluated at a torrid 36°C (96.8°F). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.
Understanding the heat index involves considering values for shaded locales with light wind. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is the result of factoring in humidity to the air temperature, indicating perceived warmth. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are particularly relevant to children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

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

Rainfall

June is the month with the most rainfall. Rain falls for 29.2 days and accumulates 350mm (13.78") of precipitation.

Sea temperature

In June, the average sea temperature is 28.2°C (82.8°F).
Note: Swimming, diving, and other activities in water temperatures between 25°C (77°F) and 29°C (84.2°F) are thought to be quite enjoyable and satisfying for extended periods, with no discomfort.

Daylight

June has the longest days of the year, with an average of 12h and 30min of daylight.
On the first day of the month, sunrise is at 05:53 and sunset at 18:22. On the last day of June, sunrise is at 05:58 and sunset at 18:28 +0530.

Sunshine

In Kalutara, the average sunshine in June is 8.2h.

UV index

The months with the lowest UV index are May, June and August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the average person.
Note: In June, a daily UV index of 6 turns into the following recommendations:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Notice! The reflection of water and sand increases the UV radiation significantly.