January weather forecast
Arugam Bay, Sri Lanka

For tourists visiting Arugam Bay, Sri Lanka in January, it is essential to be prepared for the unpredictable weather. Heavy rainfall is expected to hit the area with 120mm (4.72") of precipitation spread over approximately 19 days. However, despite the rain, sea temperatures remain pleasant, which encourages watersports activities. The humidity fluctuates, allowing some reprieve from the oppressive wetness. As January ends, the Bay's weather will display a noticeable shift towards calmer, dryer conditions.

Temperature

Arugam Bay's January weather, marked by an average high temperature of 27.3°C (81.1°F) and an average low temperature of 24°C (75.2°F), is the coldest in the year.

Heat index

The heat index for January is computed to be a tropical 30°C (86°F). Long-standing exposure and activity could induce a feeling of tiredness and lead to heat cramps.
In the scope of the heat index, its values resonate with shade and light wind conditions. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is the outcome of merging air's temperature and its humidity metrics. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are essentially critical for children. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.

Humidity

In Arugam Bay, the average relative humidity in January is 80%.

Rainfall

In Arugam Bay, Sri Lanka, during January, the rain falls for 18.7 days and regularly aggregates up to 120mm (4.72") of precipitation. Throughout the year, there are 237.8 rainfall days, and 1259mm (49.57") of precipitation is accumulated.

Sea temperature

The months with the coldest seawater are January, February, July through September and December, with an average sea temperature of 28°C (82.4°F).
Note: For swimming, diving, or other water activities, the temperature range of 25°C (77°F) to 29°C (84.2°F) is perceived as exceptionally enjoyable and comfortable even for prolonged periods.

Daylight

In Arugam Bay, the average length of the day in January is 11h and 47min.
On the first day of January in Arugam Bay, sunrise is at 06:13 and sunset at 17:58. On the last day of the month, sunrise is at 06:21 and sunset at 18:10 +0530.

Sunshine

In January, the average sunshine is 7.5h.

UV index

The months with the highest UV index in Arugam Bay are January through October, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high UV index of 7 in January translates into the following recommendations:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. 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. To cut down UV radiation exposure by about half, sport a wide-brim hat. Heed this! UV intensity is much stronger when reflected off sand and water.