March weather forecast
Colombo, Sri Lanka

As spring approaches, March in Colombo witnesses escalating temperature highs and lows, along with increasing daylight hours to 12.1 a day. A significant uptick in the amount of rainfall to 66mm (2.6") means more wet days in this month. Furthermore, the relative humidity continues to rise, hitting 76%, making it warmer and more humid than the previous months. March’s heightened moisture content can affect visibility, which remains steady at 10km (6.2mi). Kite enthusiasts may find the reduced wind speed less exhilarating but more manageable.

Temperature

Colombo's highest average temperatures are recorded in March and April, reaching a high of 31.8°C (89.2°F).

Heat index

March's average heat index is computed to be a blisteringly hot 42°C (107.6°F). Extra safeguards are necessary to prevent heat exhaustion and heat cramps. Prolonged activity might cause heatstroke.
Know that the heat index computations account for shaded terrains and slight winds. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. When relative humidity is heightened, it slows the rate of evaporation, thereby decreasing the body's ability to shed heat and creating a sensation of overheating. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

The average relative humidity in March is 76%.

Rainfall

In Colombo, Sri Lanka, during March, the rain falls for 19.8 days and regularly aggregates up to 66mm (2.6") of precipitation. In Colombo, during the entire year, the rain falls for 289.4 days and collects up to 2262mm (89.06") of precipitation.

Sea temperature

In Colombo, in March, the average water temperature is 29.1°C (84.4°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

The average length of the day in March is 12h and 5min.
On the first day of the month, sunrise is at 06:22 and sunset at 18:22. On the last day of March, sunrise is at 06:09 and sunset at 18:20 +0530.

Sunshine

In March, the average sunshine is 9h.

UV index

The months with the highest UV index are January through April, July, September, November and December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum UV index of 7 during March leads to these instructions:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Heads up! The reflection of sand and water notably intensifies UV rays from the Sun.