September weather forecast
Dematagahapelessa, Sri Lanka

The first month of the autumn, September, is still a tropical month in Dematagahapelessa, Sri Lanka, with temperature in the range of an average high of 31.2°C (88.2°F) and an average low of 22.3°C (72.1°F).

Temperature

As Dematagahapelessa welcomes September, the average high-temperature is noted at a still tropical 31.2°C (88.2°F), closely aligning with the preceding month. In Dematagahapelessa, an average nighttime temperature of 22.3°C (72.1°F) is expected during September.

Heat index

September's average heat index is estimated at a very hot 39°C (102.2°F). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.
Heat index details are generally centered around shaded locations and a mild breeze. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', determines the feeling of heat when you account for the relative humidity. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. A surge in relative humidity can disrupt the body's normal cooling function by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

March and September, with an average relative humidity of 72%, are the least humid months in Dematagahapelessa.

Rainfall

In Dematagahapelessa, during September, the rain falls for 15.2 days and regularly aggregates up to 72mm (2.83") of precipitation. In Dematagahapelessa, during the entire year, the rain falls for 217.7 days and collects up to 1165mm (45.87") of precipitation.

Daylight

The average length of the day in September is 12h and 10min.
On the first day of September in Dematagahapelessa, sunrise is at 06:00 and sunset at 18:16. On the last day of the month, sunrise is at 05:56 and sunset at 18:00 +0530.

Sunshine

The average sunshine in September in Dematagahapelessa is 10.5h.

UV index

March through September, with an average maximum UV index of 7, are months with the highest UV index in Dematagahapelessa, Sri Lanka. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for the average person.
Note: The maximum UV index of 7 during September translates into these guidelines:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.