June weather forecast
Jaffna, Sri Lanka

Weather in June

The first month of the summer, June, is also a moderately hot month in Jaffna, Sri Lanka, with average temperature varying between 29.7°C (85.5°F) and 28.4°C (83.1°F).

Temperature

In June, the average high-temperature is almost the same as in May - a moderately hot 29.7°C (85.5°F). In June, the average low-temperature is 28.4°C (83.1°F).

Heat index

In June, the average heat index is appraised at a very hot 36.2°C (97.2°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'feels like', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like differences in body mass, height, and shape, wind, clothing, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. 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. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Jaffna, the average relative humidity is 78%.

Rainfall

In Jaffna, in June, during 6.9 rainfall days, 18mm (0.71") of precipitation is typically accumulated. In Jaffna, during the entire year, the rain falls for 148.6 days and collects up to 769mm (30.28") of precipitation.

Sea temperature

In Jaffna, the average seawater temperature in June is 29.4°C (84.9°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

June has the longest days of the year in Jaffna, with an average of 12.7h of daylight.

Sunshine

June has the most sunshine of the year, with an average of 11.6h of sunshine.

UV index

January through October and December, with an average maximum UV index of 7, are months with the highest UV index in Jaffna, Sri Lanka. A UV Index reading of 6 to 7 represents a high threat to health from the exposure to the Sun's UV rays for the average person.
Note: In June, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in June in Jaffna?

In Jaffna, Sri Lanka, in June, the average high-temperature is 29.7°C (85.5°F), and the average low-temperature is 28.4°C (83.1°F). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in June is appraised at 36.2°C (97.2°F).

What is the average humidity in June in Jaffna?

The average relative humidity in June in Jaffna is 78%.

How much does it rain in Jaffna in June?

In Jaffna, Sri Lanka, in June, during 6.9 rainfall days, 18mm (0.71") of precipitation is typically accumulated.

What is the sea water temperature in June in Jaffna?

In June, the average sea temperature in Jaffna, Sri Lanka, is 29.4°C (84.9°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

When are the longest days in Jaffna?

June has the longest days of the year, with an average of 12.7h of daylight.

What is the average length of the day in June in Jaffna?

The average length of the day in June is 12.7h.

What month has the most sunshine in Jaffna?

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

How many hours of sunshine does Jaffna have in June?

In Jaffna, Sri Lanka, the average sunshine in June is 11.6h.

What are the months with the highest UV index in Jaffna?

January through October and December, with an average maximum UV index of 7, are months with the highest UV index in Jaffna.

What is the UV index intensity in June in Jaffna?

In Jaffna, Sri Lanka, the average daily maximum UV index in June is 7. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in June
Jaffna, Sri Lanka

Average temperature in June - Jaffna, Sri Lanka
  • Average high temperature in June: 29.7°C

The warmest month (with the highest average high temperature) is April (30.4°C).
The month with the lowest average high temperature is January (26.8°C).

  • Average low temperature in June: 28.4°C

The month with the highest average low temperature is May (29°C).
The coldest month (with the lowest average low temperature) is January (25.5°C).

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Average pressure in June
Jaffna, Sri Lanka

Average pressure in June - Jaffna, Sri Lanka
  • Average pressure in June: 1005.9mbar

The month with the highest atmospheric pressure is January (1012.5mbar).
The month with the lowest atmospheric pressure is June (1005.9mbar).

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Average wind speed in June
Jaffna, Sri Lanka

Average wind speed in June - Jaffna, Sri Lanka
  • Average wind speed in June: 33.8km/h

The windiest month (with the highest average wind speed) is June (33.8km/h).
The calmest months (with the lowest average wind speed) are March and April (16.7km/h).

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Average humidity in June
Jaffna, Sri Lanka

Average humidity in June - Jaffna, Sri Lanka
  • Average humidity in June: 78%

Months with the highest relative humidity are May, August and September (79%).
The month with the lowest relative humidity is March (75%).

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Average rainfall in June
Jaffna, Sri Lanka

Average rainfall in June - Jaffna, Sri Lanka
  • Average rainfall in June: 18mm

The wettest month (with the highest rainfall) is October (191mm).
The driest month (with the least rainfall) is March (13mm).

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Average rainfall days in June
Jaffna, Sri Lanka

Average rainfall days in June - Jaffna, Sri Lanka
  • Average rainfall days in June: 6.9 days

The month with the highest number of rainy days is October (22.6 days).
The month with the least rainy days is March (5.8 days).

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Average sea temperature in June
Jaffna, Sri Lanka

Average sea temperature in June - Jaffna, Sri Lanka
  • Average sea temperature in June: 29.4°C

The best month for swimming (with the highest average sea temperature) is April (30.1°C).
The coldest month (with the lowest average sea temperature) is January (26.8°C).

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Average daylight in June /
Average sunshine in June
Jaffna, Sri Lanka

Average daylight in June / Average sunshine in June - Jaffna, Sri Lanka
  • Average daylight in June: 12.7h

The month with the longest days is June (Average daylight: 12.7h).
Months with the shortest days are January and December (Average daylight: 11.6h).

  • Average sunshine in June: 11.6h

The month with the most sunshine is June (Average sunshine: 11.6h).
The month with the least sunshine is December (Average sunshine: 5.5h).

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Average sunshine days in June
Jaffna, Sri Lanka

Average sunshine days in June - Jaffna, Sri Lanka
  • Average sunshine days in June: 22.6 days

The month with the most sunshine days is March (23.9 days).
The month with the least sunshine days is November (6.3 days).

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Average UV index in June
Jaffna, Sri Lanka

Average UV index in June - Jaffna, Sri Lanka
  • Average UV index in June: 7

Months with the highest UV index are January, February, March, April, May, June, July, August, September, October and December (UV index 7).
The month with the lowest UV index is November (UV index 6).

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Average cloud cover in June
Jaffna, Sri Lanka

Average cloud cover in June - Jaffna, Sri Lanka
  • Average cloud cover in June: 28

The month with the most cloud cover is December (Cloud cover 47).
The month with the least cloud cover is March (Cloud cover 16).

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Average visibility in June
Jaffna, Sri Lanka

Average visibility in June - Jaffna, Sri Lanka
  • Average visibility in June: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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