September weather forecast
Borupana, Sri Lanka

September, the first month of the autumn in Borupana, is still a warm month, with an average temperature varying between 25.2°C (77.4°F) and 28.9°C (84°F).

Temperature

The average high-temperature during September is a still moderately hot 28.9°C (84°F), almost matching the conditions of the preceding month. The nights of September are characterized by an average low-temperature of 25.2°C (77.4°F), subtly descending from daytime highs.

Heat index

For most parts of September, the heat index is calculated to be a sweltering 35°C (95°F). Adopt heightened safety measures, heat cramps and heat exhaustion may occur. Sustained activity might cause heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

In September, the average relative humidity in Borupana, Sri Lanka, is 82%.

Rainfall

In Borupana, in September, during 24.3 rainfall days, 189mm (7.44") of precipitation is typically accumulated. Throughout the year, in Borupana, there are 272.3 rainfall days, and 2039mm (80.28") of precipitation is accumulated.

Daylight

In Borupana, the average length of the day in September is 12h and 10min.
On the first day of the month, sunrise is at 06:03 and sunset at 18:17. On the last day of September, in Borupana, sunrise is at 05:58 and sunset at 18:02 +0530.

Sunshine

The average sunshine in September is 7.5h.

UV index

The months with the highest UV index in Borupana, Sri Lanka, are January through April, July, September, November and December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A maximum UV index of 7 in September translates into the following recommendations:
Prevent overexposure. Protection from the sun's harmful effects is needed. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. During bright days, sunglasses that offer UVA and UVB defense are recommended.