September weather forecast
Vavuniya, Sri Lanka

September in Vavuniya, Sri Lanka marks the onset of Autumn, while also witnessing a final spike in monsoon showers. This month records a significant 57mm (2.24") of rainfall offering a reprieve from the consistent weather experienced in August. With this burst of showers, comes a slight decline in temperature, setting the stage for cooler and more comfortable days. Despite an increase in humidity levels, overall climate conditions remain favourable for outdoor activities. During this period, days are longer and sunnier, allowing ample time to bask in both nature's grandeur and the city's magnificent architecture.

Temperature

September ushers in an average high-temperature of a still tropical 32.6°C (90.7°F) in Vavuniya, aligning closely with the preceding month. During the month of September, the nighttime temperature falls to an average of 24.8°C (76.6°F).

Heat index

For most parts of September, the heat index is estimated at a blisteringly hot 43°C (109.4°F). Keep on guard: Heat exhaustion and heat cramps are probable. Heatstroke is a possible danger with ongoing physical activity.
Data suggests that the heat index is set for environments in shade and with a light wind. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', takes into account both air temperature and humidity to illustrate what people actually feel. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. Under high air temperature coupled with high humidity (high heat index), the body's perspiration is reduced, intensifying the sensation of heat. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

The months with the lowest humidity are July through September, with an average relative humidity of 71%.

Rainfall

In September, the rain falls for 14 days. Throughout September, 57mm (2.24") of precipitation is accumulated. Throughout the year, in Vavuniya, there are 199.1 rainfall days, and 893mm (35.16") of precipitation is accumulated.

Daylight

The average length of the day in September in Vavuniya, Sri Lanka, is 12h and 10min.
On the first day of the month, sunrise is at 05:59 and sunset at 18:16. On the last day of September, in Vavuniya, sunrise is at 05:56 and sunset at 17:59 +0530.

Sunshine

The average sunshine in September in Vavuniya is 9.6h.

UV index

The months with the highest UV index are February through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: In September, an average UV index of 7 transforms into the following instructions:
Deflect overexposure. Sun protection is a necessity. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.