May weather forecast
Jaffna, Sri Lanka

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Weather in May

May offers strikingly warm sea temperature conditions, beckoning swimmers to its shores. Climatic conditions manifest with an average rainfall of 26mm (1.02"), slightly higher than in preceding months. Predominant weather characteristics in May are often characterized by high humidity, moderately strong winds, and extended daylight. Though the winds pick up somewhat, they do little to cool the tropical climate of Jaffna.

Temperature

The shift to May in Jaffna signals an average high-temperature of a still tropical 30.3°C (86.5°F), subtly varied from April's 30.4°C (86.7°F). The nighttime temperature in Jaffna, Sri Lanka, demonstrates a marginal decline, averaging at a warm 29°C (84.2°F) during May.

Heat index

The heat index value during May is calculated to be a very hot 38°C (100.4°F). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
Perspiration and the resultant sweat evaporation are the body's natural thermostat, helping regulate temperature. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.

Humidity

May, August and September, with an average relative humidity of 79%, are the most humid months.

Rainfall

In Jaffna, in May, it is raining for 6.9 days, with typically 26mm (1.02") of accumulated precipitation. Throughout the year, there are 148.6 rainfall days, and 769mm (30.28") of precipitation is accumulated.

Sea temperature

In May, the average sea temperature in Jaffna is 30°C (86°F).
Note: Many argue that waters with temperatures surpassing 30°C (86°F) fail to offer the cooling sensation swimmers look for.

Daylight

In Jaffna, the average length of the day in May is 12h and 34min.
On the first day of the month, sunrise is at 05:52 and sunset at 18:21. On the last day of May, in Jaffna, sunrise is at 05:48 and sunset at 18:27 +0530.

Sunshine

In May, the average sunshine in Jaffna 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. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for average individuals.
Note: In May, the average maximum UV index of 7 translates into the following recommendations:
Resist extreme sun exposure. Guarding against solar damage is essential. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Alert! Sand and water increase UV exposure due to their reflective properties.

Frequently asked questions

How hot does it get in Jaffna in May?

In Jaffna, 30.3°C (86.5°F) is the average high-temperature and 29°C (84.2°F) is the average low-temperature during May. The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in May is calculated to be 38°C (100.4°F).

What is the most humid month in Jaffna?

May, August and September, with an average relative humidity of 79%, are most humid months in Jaffna.

What is the average humidity in May in Jaffna?

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

How many days does it rain in May in Jaffna?

In May, in Jaffna, the rain falls for 6.9 days. Throughout May, 26mm (1.02") of precipitation is accumulated.

What is the sea water temperature in May in Jaffna?

In Jaffna, in May, the average water temperature is 30°C (86°F). For swimming, other intense water activities, temperature above 30°C (86°F) is arguably unpleasant, as the water cooling effect is missing.

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

In Jaffna, Sri Lanka, the average day length in May is 12h and 34min.

What time are sunrise and sunset in May in Jaffna?

On the first day of May, sunrise is at 05:52 and sunset at 18:21. On the last day of the month, sunrise is at 05:48 and sunset at 18:27 +0530.

How many hours of sunshine does Jaffna have in May?

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

What is the month 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 May in Jaffna?

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

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).

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).

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).

Average humidity in May
Jaffna, Sri Lanka

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

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

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).

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).

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).

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: 12h and 4min

The month with the longest days is June (Average daylight: 12h and 42min).
The month with the shortest days is December (Average daylight: 11h and 36min).

  • Average sunshine in May: 11h and 3min

The month with the most sunshine is June (Average sunshine: 11h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).

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).

Average UV index in May
Jaffna, Sri Lanka

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

The 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).

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).

Average visibility in May
Jaffna, Sri Lanka

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

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

Jaffna, Sri Lanka

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