September weather forecast
Dunuwila, Sri Lanka

The first month of the autumn, September, is still a warm month in Dunuwila, Sri Lanka, with an average temperature fluctuating between 29.5°C (85.1°F) and 21.1°C (70°F).

Temperature

September's beginning signals an average high-temperature of a still warm 29.5°C (85.1°F), barely different from August's 29.2°C (84.6°F). Dunuwila, during September, witnesses an average low-temperature of 21.1°C (70°F).

Heat index

For September, the heat index is calculated to be a sweltering 35°C (95°F). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.
When assessing, remember that heat index measurements are for light winds and shaded spots. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
Perspiring is a crucial mechanism for the human body, allowing it to release excessive warmth through evaporating sweat. 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. The body is at risk of dehydration and related complications when it fails to shed excessive heat.

Humidity

In Dunuwila, the average relative humidity in September is 77%.

Rainfall

In September, in Dunuwila, the rain falls for 23.4 days. Throughout September, 118mm (4.65") of precipitation is accumulated. In Dunuwila, Sri Lanka, during the entire year, the rain falls for 278.4 days and collects up to 1466mm (57.72") of precipitation.

Daylight

In September, the average length of the day in Dunuwila is 12h and 10min.
On the first day of the month, sunrise is at 05:59 and sunset at 18:14. On the last day of September, sunrise is at 05:55 and sunset at 17:59 +0530.

Sunshine

In Dunuwila, the average sunshine in September is 10.3h.

UV index

January through September, November and December, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for average individuals.
Note: In September, a regular UV index of 6 translates into these guidelines:
Shun overexposure. Protection from sun ravages is indispensable. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.