May weather forecast
Jaffna, Sri Lanka

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.