September weather forecast
Dediyawala, Sri Lanka

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

Temperature

With the advent of September, Dediyawala's high-temperatures adjust to a still moderately hot 28.8°C (83.8°F), closely aligning with the preceding month. During the nights of September, Dediyawala maintains an almost steady temperature with an average low of 25.2°C (77.4°F).

Heat index

September's average heat index is computed to be a very hot 35°C (95°F). Adopt heightened safety measures, heat cramps and heat exhaustion may occur. Sustained activity might cause heatstroke.
Keep in mind the heat index values are meant for areas in shade and with light wind. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. 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. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

In September, the average relative humidity is 82%.

Rainfall

In September, in Dediyawala, the rain falls for 26.3 days. Throughout September, 201mm (7.91") of precipitation is accumulated. Throughout the year, in Dediyawala, there are 273.8 rainfall days, and 2059mm (81.06") of precipitation is accumulated.

Daylight

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

Sunshine

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

UV index

January through April, July, September through December, with an average maximum UV index of 7, are months with the highest UV index in Dediyawala. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily high UV index of 7 during September translates into the following recommendations:
Ward off overexposure. Defence against solar harm is crucial. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.