January weather forecast
Unawatuna, Sri Lanka

Unawatuna's weather in January is characterized by moderate rainfall and overall warmth, setting a tone for the year in Sri Lanka. Prevailing winds move at an average speed of 7.8km/h (4.8mph) and the town experiences 12.8 sunshine days, conducive for most outdoor activities. The weather conditions remain conducive for visiting the beach, with the monthly sea temperature holding steady at 28°C (82.4°F). This month, compared to its predecessor December, sees slightly increased temperatures and precipitation. The shift to February will bring minor adjustments including increased rainfall and slight temperature fluctuations.

Temperature

Unawatuna's average high-temperature in January is a still moderately hot 29.2°C (84.6°F), indicating a subtle variation from December. An average low-temperature of 24°C (75.2°F) is anticipated throughout the nights during January.

Heat index

The heat index value during January is computed to be a sweltering 35°C (95°F). Implement more safety precautions, heat cramps and heat exhaustion may happen. Persistent activity could induce heatstroke.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a metric representing the sensation of warmth when air temperature and moisture come together. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
When the body gets too warm, it perspires, leading to sweat evaporation which cools it down. Under conditions of increased relative humidity, the evaporation rate lessens, causing the body to retain more heat than under less humid conditions. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

The average relative humidity in January is 78%.

Rainfall

The month with the least rainfall is January, when the rain falls for 14.8 days and typically collects 38mm (1.5") of precipitation.

Sea temperature

January, February, June through October and December, with an average sea temperature of 28°C (82.4°F), are months with the coldest seawater.
Note: 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.

Daylight

The average length of the day in January is 11h and 49min.
On the first day of January, sunrise is at 06:18 and sunset at 18:05. On the last day of the month, sunrise is at 06:26 and sunset at 18:18 +0530.

Sunshine

The average sunshine in January is 9h.

UV index

The months with the highest UV index are January through April, June through August, October through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.
Note: The maximum UV index of 7 during January leads to these instructions:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Attention! UV radiation is markedly stronger with water and sand reflections.