September weather forecast
Metihakka, Sri Lanka

The first month of the autumn, September, is still a tropical month in Metihakka, Sri Lanka, with temperature in the range of an average high of 31°C (87.8°F) and an average low of 22.2°C (72°F).

Temperature

The shift into September records an average high-temperature of a still tropical 31°C (87.8°F), subtly varied from August's 30.8°C (87.4°F). The nighttime temperature dips to an agreeable 22.2°C (72°F) on average during September.

Heat index

The heat index for September is appraised at a torrid 39°C (102.2°F). Take more preventive steps, risk of heat exhaustion and heat cramps is elevated. Long activity may culminate in heatstroke.
Heat index details are generally centered around shaded locations and a mild breeze. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'feels like' or 'felt air temperature', determines the feeling of heat when you account for the relative humidity. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. When air moisture content is high, the cooling process through evaporation is not as efficient, leading to an ineffective body cooling process and a feeling of overheating. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

In Metihakka, the average relative humidity in September is 73%.

Rainfall

In September, the rain falls for 16.3 days. Throughout September, 82mm (3.23") of precipitation is accumulated. In Metihakka, during the entire year, the rain falls for 218.8 days and collects up to 1175mm (46.26") of precipitation.

Daylight

The average length of the day in September 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, in Metihakka, sunrise is at 05:55 and sunset at 17:59 +0530.

Sunshine

In September, the average sunshine in Metihakka is 10.3h.

UV index

March through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The UV index of 7 during September leads to these advisories:
Guard against overexposure. Protection from sun-induced harm is essential. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.