September weather forecast
Vannivilankulam, Sri Lanka

The first month of the autumn, September, is also a moderately hot month in Vannivilankulam, Sri Lanka, with an average temperature varying between 29.9°C (85.8°F) and 27°C (80.6°F).

Temperature

With the onset of September, the average high-temperature stands at a still moderately hot 29.9°C (85.8°F), closely aligned with August's 29.8°C (85.6°F). Vannivilankulam experiences a minimal drop from daytime high temperatures, recording an average low-temperature of 27°C (80.6°F) throughout September.

Heat index

The average heat index in September is estimated at a sweltering 37°C (98.6°F). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'feels like' or 'apparent temperature', shows a temperature sensation when both heat and moisture conditions are combined. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.

Humidity

In September, the average relative humidity is 77%.

Rainfall

In Vannivilankulam, in September, it is raining for 15.5 days, with typically 45mm (1.77") of accumulated precipitation. In Vannivilankulam, during the entire year, the rain falls for 181.2 days and collects up to 849mm (33.43") of precipitation.

Daylight

In September, the average length of the day in Vannivilankulam is 12h and 10min.
On the first day of September, sunrise is at 05:59 and sunset at 18:17. On the last day of the month, sunrise is at 05:56 and sunset at 17:59 +0530.

Sunshine

In September, the average sunshine is 9.7h.

UV index

January through October and December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for average individuals.
Note: A daily high UV index of 7 in September leads to these guidelines:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.