September weather forecast
Peradeniya, Sri Lanka

The first month of the autumn, September, is still a warm month in Peradeniya, Sri Lanka, with an average temperature fluctuating between 21.1°C (70°F) and 29.5°C (85.1°F).

Temperature

The shift from August to September is characterized by an average high-temperature of a still warm 29.5°C (85.1°F), not significantly different from the 29.2°C (84.6°F) of August. Peradeniya records an average low of 21.1°C (70°F) throughout the nights in September.

Heat index

Throughout September, the heat index is calculated to be a sweltering 35°C (95°F). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.
Heat index determinations are made taking into account the shade and light air movements. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is found by incorporating humidity levels into the air temperature measurement. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young ones generally face higher dangers than adults since they sweat less. Along with their large skin surface area compared totheir small bodies and increased heat production from their activities, the risks are heightened.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. Rising body temperatures due to excess heat retention could signify impending heat disorders.

Humidity

In Peradeniya, the average relative humidity in September is 77%.

Rainfall

In Peradeniya, in September, it is raining for 23.4 days, with typically 118mm (4.65") of accumulated precipitation. Throughout the year, in Peradeniya, there are 278.4 rainfall days, and 1466mm (57.72") of precipitation is accumulated.

Daylight

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

Sunshine

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

UV index

January through September, November and December, with an average maximum UV index of 6, are months with the highest UV index in Peradeniya. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for average individuals.
Note: A maximum high UV index of 6 in September translates into the following recommendations:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.