September weather forecast
Vellankulam, Sri Lanka

The first month of the autumn, September, is also a moderately hot month in Vellankulam, 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, Vellankulam's average high-temperature clocks in at a still moderately hot 29.9°C (85.8°F), showing a minor fluctuation from the previous month. The nights of September cool down to an average low of 27°C (80.6°F), subtly lower than daytime highs.

Heat index

Throughout September, the heat index is computed to be a very hot 37°C (98.6°F). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
Know that the heat index computations account for shaded terrains and slight winds. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'real feel', measures the perceived warmth when incorporating the humidity present in the air. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in September is 77%.

Rainfall

In September, the rain falls for 15.5 days. Throughout September, 45mm (1.77") of precipitation is accumulated. Throughout the year, there are 181.2 rainfall days, and 849mm (33.43") of precipitation is accumulated.

Daylight

In Vellankulam, Sri Lanka, the average length of the day in September is 12h and 11min.
On the first day of September in Vellankulam, sunrise is at 06:00 and sunset at 18:18. On the last day of the month, sunrise is at 05:57 and sunset at 18:00 +0530.

Sunshine

In Vellankulam, the average sunshine in September 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 estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the UV index of 7 transforms into the following advice:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.