September weather forecast
Kohuwala, Sri Lanka

The first month of the autumn, September, is still a warm month in Kohuwala, Sri Lanka, with temperature in the range of an average low of 25.3°C (77.5°F) and an average high of 28.9°C (84°F).

Temperature

The arrival of September sees an average high-temperature of a still warm 28.9°C (84°F), hardly diverging from August's 28.7°C (83.7°F). With a barely noticeable fluctuation in temperature, Kohuwala reaches an average low of 25.3°C (77.5°F) during the September nights.

Heat index

For most parts of September, the heat index is computed to be a very hot 35°C (95°F). Heightened safety actions are necessary, heat cramps and heat exhaustion are probable. Persistent activity may lead to heatstroke.
Note that heat index values are valued for light wind and location in the shade. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is the result of factoring in humidity to the air temperature, indicating perceived warmth. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. 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 are quite important for babies and toddlers. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

Humidity

In September, the average relative humidity is 82%.

Rainfall

In September, in Kohuwala, the rain falls for 25.8 days. Throughout September, 248mm (9.76") of precipitation is accumulated. In Kohuwala, during the entire year, the rain falls for 286 days and collects up to 2254mm (88.74") of precipitation.

Daylight

In September, the average length of the day 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, sunrise is at 05:58 and sunset at 18:02 +0530.

Sunshine

In Kohuwala, Sri Lanka, the average sunshine in September is 7.3h.

UV index

January through April, June, July, September, November and December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for the average person.
Note: The average daily UV index of 7 in September transforms into the following instructions:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. 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. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.