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

During January and December, Polonnaruwa experiences its coldest period, with an average high-temperature of 29.3°C (84.7°F).

Heat index

The heat index value for January is evaluated at a sweltering 36°C (96.8°F). Heightened safety actions are necessary, heat cramps and heat exhaustion are probable. Persistent activity may lead to heatstroke.
The metrics for the heat index are tailored for both shady environments and light winds. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', represents the fusion of temperature and moisture in the air to suggest how warm it feels. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

In January, the average relative humidity is 82%.

Rainfall

In Polonnaruwa, Sri Lanka, in January, during 16 rainfall days, 42mm (1.65") of precipitation is typically accumulated. Throughout the year, there are 196.8 rainfall days, and 943mm (37.13") of precipitation is accumulated.

Daylight

In Polonnaruwa, the average length of the day in January is 11h and 43min.
On the first day of January in Polonnaruwa, 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

The average sunshine in January is 7.4h.

UV index

The months with the lowest UV index are January, November and December, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index of 6 during January leads to these instructions:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.