January weather forecast
Kalutara, Sri Lanka

Kalutara experiences a tropical climate consistent with the rest of Sri Lanka in January. Warm temperatures ranging from 23.4°C (74.1°F) to 30.3°C (86.5°F) give way to an excellent beach weather. Sitting above the equator, Kalutara enjoys longer daylight hours approximated at 11.8 hours and a relative humidity of 75%. January marks the start of the year with expected rainfall amounting to 25mm (0.98") which falls within a span of 8.9 days. Seasoned travelers know this as an ideal time for outdoor activities before the heavy rains.

Temperature

Kalutara indicates an average high-temperature of a hot 30.3°C (86.5°F) in January, showing minor variation from December's 29.7°C (85.5°F). January witnesses an average nighttime temperature of 23.4°C (74.1°F).

Heat index

During January, the heat index is evaluated at a sweltering 37°C (98.6°F). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.
When assessing, remember that heat index measurements are for light winds and shaded spots. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a composite of temperature and humidity figures to convey how warm it feels. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. When the level of relative humidity is elevated, evaporation diminishes, causing more warmth to be retained in the body than in dry air. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

January and February, with an average relative humidity of 75%, are the least humid months.

Rainfall

The month with the least rainfall in Kalutara is January, when the rain falls for 8.9 days and typically collects 25mm (0.98") of precipitation.

Sea temperature

In Kalutara, the average seawater temperature in January is 27.7°C (81.9°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

The average length of the day in January in Kalutara is 11h and 47min.
On the first day of January, sunrise is at 06:20 and sunset at 18:05. On the last day of the month, sunrise is at 06:28 and sunset at 18:18 +0530.

Sunshine

January has the most sunshine of the year, with an average of 9.2h of sunshine.

UV index

January through April, July, September through December, with an average maximum UV index of 7, are months with the highest UV index in Kalutara, Sri Lanka. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: In January, the maximum UV index of 7 suggests this advice:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Stay cautious! Sand and water reflections increase UV radiation potency.