January weather forecast
Polonnaruwa, Sri Lanka

In Polonnaruwa, Sri Lanka, January is characterized by a comparably moderate climate. It is preceded by a cooler December, and while the temperature increases slightly in February, the difference is relatively minor. Humidity and rainfall are notably high this month. With an average rainfall of 42mm (1.65") over 16 days and a relative humidity of 82%, one might often find the city shrouded in mist or light rain.

Temperature

In Polonnaruwa, January and December are characterised by the lowest temperatures, recording an average high of 29.3°C (84.7°F).

Heat index

January's mean heat index is computed to be a fiery hot 36°C (96.8°F). Exercise increased caution, heat cramps and heat exhaustion are potential hazards. Continuous activity could lead to heatstroke.
Heat index values are typically calculated for conditions of shade and a light breeze. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is the outcome of merging air's temperature and its humidity metrics. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

In January, the average relative humidity in Polonnaruwa is 82%.

Rainfall

In January, in Polonnaruwa, the rain falls for 16 days. Throughout January, 42mm (1.65") of precipitation is accumulated. In Polonnaruwa, during the entire year, the rain falls for 196.8 days and collects up to 943mm (37.13") of precipitation.

Daylight

In January, the average length of the day in Polonnaruwa is 11h and 43min.
On the first day of January, sunrise is at 06:19 and sunset at 17:59. On the last day of the month, sunrise is at 06:25 and sunset at 18:12 +0530.

Sunshine

In January, the average sunshine is 7.4h.

UV index

January, November and December, with an average maximum UV index of 6, are months with the lowest UV index in Polonnaruwa. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: In January, the average maximum UV index of 6 translates into the following recommendations:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.