September weather forecast
Selagama, Sri Lanka

The first month of the autumn, September, is also a hot month in Selagama, Sri Lanka, with an average temperature fluctuating between 31.2°C (88.2°F) and 22.3°C (72.1°F).

Temperature

The advent of September denotes an average high-temperature of a still tropical 31.2°C (88.2°F), subtly different from August's 30.8°C (87.4°F). Selagama sees an average low-temperature of 22.3°C (72.1°F) during September.

Heat index

September's mean heat index is estimated at a fiery hot 39°C (102.2°F). Take additional safety steps, risk of heat exhaustion and heat cramps is notable. Prolonged activity may cause heatstroke.
Heat index determinations are made taking into account the shade and light air movements. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', determines the feeling of heat when you account for the relative humidity. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

March and September, with an average relative humidity of 72%, are the least humid months.

Rainfall

In Selagama, during September, the rain falls for 15.2 days and regularly aggregates up to 72mm (2.83") of precipitation. In Selagama, during the entire year, the rain falls for 217.7 days and collects up to 1165mm (45.87") of precipitation.

Daylight

In September, the average length of the day in Selagama is 12h and 10min.
On the first day of the month, sunrise is at 05:59 and sunset at 18:15. On the last day of September, sunrise is at 05:55 and sunset at 17:59 +0530.

Sunshine

In Selagama, the average sunshine in September is 10.5h.

UV index

The months with the highest UV index in Selagama are March through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the average person.
Note: A typical high UV index of 7 in September suggests the following recommendations:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.