September weather forecast
Wegiriya, Sri Lanka

The first month of the autumn, September, is also a moderately hot month in Wegiriya, Sri Lanka, with temperature in the range of an average high of 29.5°C (85.1°F) and an average low of 21.1°C (70°F).

Temperature

September's onset records a minor alteration in the average high-temperature to a still moderately hot 29.5°C (85.1°F) from August's 29.2°C (84.6°F). September nights in Wegiriya experience a consistent temperature drop to an agreeable 21.1°C (70°F).

Heat index

September's heat index is appraised at a sweltering 35°C (95°F). Adopt special protective actions against heat exhaustion and heat cramps. Long-duration activity risks heatstroke.
Understanding the heat index involves considering values for shaded locales with light wind. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

In September, the average relative humidity is 77%.

Rainfall

In Wegiriya, during September, the rain falls for 23.4 days and regularly aggregates up to 118mm (4.65") of precipitation. Throughout the year, in Wegiriya, Sri Lanka, there are 278.4 rainfall days, and 1466mm (57.72") of precipitation is accumulated.

Daylight

The average length of the day in September in Wegiriya is 12h and 10min.
On the first day of September, sunrise is at 06:00 and sunset at 18:15. On the last day of the month, sunrise is at 05:55 and sunset at 17:59 +0530.

Sunshine

The average sunshine in September is 10.3h.

UV index

The months with the highest UV index are January through September, 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 rays for the ordinary person.
Note: The maximum daily UV index of 6 during September translates into the following directions:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.