May weather forecast and climate
Jaffna, Sri Lanka

Weather in May

The last month of the spring, May, is another hot month in Jaffna, Sri Lanka, with average temperature varying between 29°C (84.2°F) and 30.3°C (86.5°F).

Temperature

In Jaffna, the average high-temperature is essentially the same as in April - a still hot 30.3°C (86.5°F). In Jaffna, the average low-temperature is 29°C (84.2°F).

Heat index

In May, the average heat index is appraised at a sweltering 38.3°C (100.9°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'real feel', or 'apparent temperature', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like differences in body mass, height, and shape, pregnancy, clothing, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

Months with the highest humidity in Jaffna are May, August and September, with an average relative humidity of 79%.

Rainfall

In Jaffna, during May, the rain falls for 6.9 days and regularly aggregates up to 26mm (1.02") of precipitation. 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, Sri Lanka, the average seawater temperature in May is 30°C (86°F).
Note: For swimming, other intense water activities, temperature above 30°C (86°F) is arguably unpleasant, as the water cooling effect is missing.

Daylight

The average length of the day in May is 12.6h.

Sunshine

In Jaffna, the average sunshine is 11.5h.

UV index

January through October and December, with an average maximum UV index of 7, are months with the highest UV index in Jaffna. A UV Index estimate of 6 to 7 represents a high health hazard from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 7 transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 May in Jaffna?

In May, in Jaffna, Sri Lanka, the average high-temperature is 30.3°C (86.5°F), and the average low-temperature is 29°C (84.2°F). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines relative humidity and air temperature, in May is appraised at 38.3°C (100.9°F).

What are the most humid months in Jaffna?

Months with the highest humidity in Jaffna are May, August and September, with an average relative humidity of 79%.

What is the average humidity in May in Jaffna?

In May, the average relative humidity in Jaffna, Sri Lanka, is 79%.

How much does it rain in Jaffna in May?

In Jaffna, during May, the rain falls for 6.9 days and regularly aggregates up to 26mm (1.02") of precipitation.

What is the sea temperature in May in Jaffna?

In Jaffna, Sri Lanka, in May, the average water temperature is 30°C (86°F). The surface water temperatures above 30°C (86°F) are arguably considered as unpleasant for swimming, and any intense water activity, as the refreshing effect of water is missing.

How many hours of daylight does Jaffna have in May?

In May, the average length of the day is 12.6h.

How long on average sun shines in May in Jaffna?

In May, the average sunshine in Jaffna is 11.5h.

When is 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.

How high is the UV index in May in Jaffna?

In Jaffna, the average daily maximum UV index in May is 7. A UV Index value of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV radiation.

Average temperature in May
Jaffna, Sri Lanka

Average temperature in May - Jaffna, Sri Lanka
  • Average high temperature in May: 30.3°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 May: 29°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 May
Jaffna, Sri Lanka

Average pressure in May - Jaffna, Sri Lanka
  • Average pressure in May: 1006.5mbar

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 May
Jaffna, Sri Lanka

Average wind speed in May - Jaffna, Sri Lanka
  • Average wind speed in May: 28.5km/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 May
Jaffna, Sri Lanka

Average humidity in May - Jaffna, Sri Lanka
  • Average humidity in May: 79%

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 May
Jaffna, Sri Lanka

Average rainfall in May - Jaffna, Sri Lanka
  • Average rainfall in May: 26mm

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 May
Jaffna, Sri Lanka

Average rainfall days in May - Jaffna, Sri Lanka
  • Average rainfall days in May: 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 May
Jaffna, Sri Lanka

Average sea temperature in May - Jaffna, Sri Lanka
  • Average sea temperature in May: 30°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 May /
Average sunshine in May
Jaffna, Sri Lanka

Average daylight in May / Average sunshine in May - Jaffna, Sri Lanka
  • Average daylight in May: 12.6h

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 May: 11.5h

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 May
Jaffna, Sri Lanka

Average sunshine days in May - Jaffna, Sri Lanka
  • Average sunshine days in May: 23.7 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 May
Jaffna, Sri Lanka

Average UV index in May - Jaffna, Sri Lanka
  • Average UV index in May: 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 May
Jaffna, Sri Lanka

Average cloud cover in May - Jaffna, Sri Lanka
  • Average cloud cover in May: 23

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 May
Jaffna, Sri Lanka

Average visibility in May - Jaffna, Sri Lanka
  • Average visibility in May: 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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