January weather forecast and climate
Colombo, Sri Lanka

Enero, the same as Diciembre, in Colombo, Sri Lanka, is another hot winter month, with average temperature ranging between max 30.9°C (87.6°F) and min 22.3°C (72.1°F).
An excellent water temperature of 27.7°C (81.9°F) and only 5 rainfall días, with 58.2mm (2.29") of accumulated rainfall, makes Enero a prime for swimming and other water activities.

Temperature

In Enero, the average high-temperature is relatively the same as in Diciembre - a still hot 30.9°C (87.6°F). In Colombo, the average low-temperature is 22.3°C (72.1°F).

Heat index

In Enero, the average heat index is estimated at a torrid 37°C (98.6°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'felt air temperature', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, pregnancy, metabolic differences), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

Months with the lowest humidity are Enero and Febrero, with an average relative humidity of 69%.

Rainfall

Enero is the month with the least rainfall in Colombo. Rain falls for 5 days and accumulates 58.2mm (2.29") of precipitation.

Sea temperature

In Colombo, in Enero, the average water temperature is 27.7°C (81.9°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In Colombo, the average length of the day in Enero is 11.8h.

Sunshine

In Colombo, the average sunshine is 8h.

UV index

Enero, Noviembre and Diciembre, with an average maximum UV index of 11, are months with the lowest UV index. A UV Index value of 11, and more, symbolizes an extreme health hazard from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In Enero, the average maximum UV index of 11 translate into the following recommendations:
Practice all essential precautions. Protection against sun damage is crucial. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.