September weather forecast
Ambalantota, Sri Lanka

The first month of the autumn, September, is still a tropical month in Ambalantota, Sri Lanka, with an average temperature varying between 26°C (78.8°F) and 30.1°C (86.2°F).

Temperature

Welcoming September, Ambalantota notes an average high-temperature of a still hot 30.1°C (86.2°F), nearly consistent with August's 30.4°C (86.7°F). During September, Ambalantota's temperature shows a minor deviation from daytime highs, falling to a steady low-temperature average of 26°C (78.8°F).

Heat index

In September, the heat index is evaluated at a very hot 37°C (98.6°F). Implement additional cautionary measures, heat cramps and heat exhaustion could occur. Prolonged activity might induce heatstroke.
In reference to the heat index, it's for places in shade and with a slight wind. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', combines both the air temperature and the humidity level to give a perceived human temperature. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration, which is the evaporation of sweat, is a primary way the human body manages and dispels excessive warmth. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

In September, the average relative humidity in Ambalantota is 75%.

Rainfall

In September, the rain falls for 14.4 days. Throughout September, 48mm (1.89") of precipitation is accumulated. Throughout the year, in Ambalantota, there are 192.9 rainfall days, and 942mm (37.09") of precipitation is accumulated.

Daylight

In September, the average length of the day in Ambalantota is 12h and 9min.
On the first day of September, sunrise is at 05:58 and sunset at 18:12. On the last day of the month, sunrise is at 05:53 and sunset at 17:57 +0530.

Sunshine

The average sunshine in September is 10.7h.

UV index

January through September, November and December, with an average maximum UV index of 7, are months with the highest UV index in Ambalantota. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: The daily high UV index of 7 in September translates into this advice:
Resist extreme sun exposure. Guarding against solar damage is essential. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.