June weather forecast
Jaffna, Sri Lanka

June observes the wind speed reaching its peak for the year, averaging 33.8km/h (21mph). Amid this increase, the weather persists to be sultry as humidity levels remain high. June’s climate pattern embodies sunny days and the occasional rain shower. Despite being smack in the middle of the year, swimmers can still relish in comfortably warm sea temperatures. A characteristic environment of a tropical city like Jaffna prevails, with overcast skies often giving way to sunshine.

Temperature

With the start of June, Jaffna measures an average high-temperature of a moderately hot 29.7°C (85.5°F), not significantly differing from May's 30.3°C (86.5°F). Nighttime temperature in Jaffna reflects an average dip to 28.4°C (83.1°F) in June, subtly cooler than its daytime highs.

Heat index

For most parts of June, the heat index is calculated to be a sweltering 36°C (96.8°F). Exercise heightened safety, heat cramps and heat exhaustion are probable. Persistent activity may provoke heatstroke.
Bear in mind that the heat index values are determined for shaded areas and light breezes. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'feels like', gauges the sensation of temperature factoring in the air's moisture content. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. When relative humidity is heightened, it slows the rate of evaporation, thereby decreasing the body's ability to shed heat and creating a sensation of overheating. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

In Jaffna, the average relative humidity in June is 78%.

Rainfall

In Jaffna, in June, it is raining for 6.9 days, with typically 18mm (0.71") of accumulated precipitation. Throughout the year, in Jaffna, there are 148.6 rainfall days, and 769mm (30.28") of precipitation is accumulated.

Sea temperature

In Jaffna, the average seawater temperature in June is 29.4°C (84.9°F).
Note: Swimming, diving, and other water activities in temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are highly enjoyable and provide prolonged comfort without unease.

Daylight

The month with the longest days is June, with an average of 12h and 42min of daylight.
On the first day of June in Jaffna, sunrise is at 05:48 and sunset at 18:27. On the last day of the month, sunrise is at 05:53 and sunset at 18:34 +0530.

Sunshine

With an average of 11.6h of sunshine, June has the most sunshine of the year in Jaffna.

UV index

The months with the highest UV index in Jaffna are January through October and December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: A daily high UV index of 7 in June leads to these guidelines:
Ward off overexposure. Defence against solar harm is crucial. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Attention! The reflection of both water and sand can increase the intensity of UV rays.