September weather forecast
Bandaragama, Sri Lanka

September, the first month of the autumn in Bandaragama, is still a warm month, with an average temperature varying between 28.8°C (83.8°F) and 25.2°C (77.4°F).

Temperature

Entering September, the average high-temperature is recorded at a still warm 28.8°C (83.8°F), exhibiting a minimal shift from August's 28.6°C (83.5°F). Throughout September, a modest shift from daytime highs is anticipated in Bandaragama, with an average low-temperature of 25.2°C (77.4°F).

Heat index

In September, the heat index is estimated at a fiery hot 35°C (95°F). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', gives a temperature feeling by integrating air temperature and humidity. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Young ones generally face higher dangers than adults since they sweat less. Along with their large skin surface area compared totheir small bodies and increased heat production from their activities, the risks are heightened.
The human body has a built-in cooling mechanism through perspiration; evaporating sweat dissipates the excess heat. 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. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

Humidity

In September, the average relative humidity is 82%.

Rainfall

In Bandaragama, Sri Lanka, in September, during 26.3 rainfall days, 201mm (7.91") of precipitation is typically accumulated. Throughout the year, in Bandaragama, there are 273.8 rainfall days, and 2059mm (81.06") of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 10min.
On the first day of the month, sunrise is at 06:02 and sunset at 18:17. On the last day of September, in Bandaragama, sunrise is at 05:57 and sunset at 18:01 +0530.

Sunshine

In Bandaragama, the average sunshine in September is 7.6h.

UV index

The months with the highest UV index are January through April, July, September through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 7 during September leads to these advisories:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.